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A critical review on the effect of nitrate pollution in aquatic invertebrates and fish

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Apart from anthropogenic pollution, nitrate contamination is prevalent in practically all developing countries as a result of increased natural activities. The accumulation of nitrates in water bodies causes cumulative effects on living species, environmental receptors, and human vitality by accumulation along the food chain. Nitrates have recently piqued the interest of academics due to their widespread pollution of surface and groundwater systems. The presence of nitrate in high amounts in surface and groundwater causes a variety of health issues, including methemoglobinemia, diabetes, the emergence of infectious diseases, and a negative impact on aquatic organisms. Sensing nitrate is an alternative method for measuring the distribution of nitrate in various bodies of water. The nitrate-laden wastes from agricultural run-off, industrial discharges, and livestock and poultry farms contaminate resources. Nitrate toxicity shows swimming alteration, growth retardation, and eventually death among aquatic organisms. In fishes, it causes histopathological alteration of gills, esophagus, and brain. Therefore, this present review discusses the toxic concentration of nitrates, its adverse effects on the aquatic animals and the assessment of the safe limit of nitrate that is crucial to prevent chronic toxicity among invertebrates and fish. Graphical Abstract
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Water Air Soil Pollut (2023) 234:333
https://doi.org/10.1007/s11270-023-06260-5
A critical review ontheeffect ofnitrate pollution inaquatic
invertebrates andfish
PriyajitBanerjee· PramitaGarai·
NimaiChandraSaha· ShubhajitSaha·
PramitaSharma· ArpanKumarMaiti
Received: 14 September 2022 / Accepted: 21 March 2023
© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023
Abstract Apart from anthropogenic pollution,
nitrate contamination is prevalent in practically all
developing countries as a result of increased natu-
ral activities. The accumulation of nitrates in water
bodies causes cumulative effects on living species,
environmental receptors, and human vitality by accu-
mulation along the food chain. Nitrates have recently
piqued the interest of academics due to their wide-
spread pollution of surface and groundwater systems.
The presence of nitrate in high amounts in surface
and groundwater causes a variety of health issues,
including methemoglobinemia, diabetes, the emer-
gence of infectious diseases, and a negative impact
on aquatic organisms. Sensing nitrate is an alterna-
tive method for measuring the distribution of nitrate
in various bodies of water. The nitrate-laden wastes
from agricultural run-off, industrial discharges, and
livestock and poultry farms contaminate resources.
Nitrate toxicity shows swimming alteration, growth
retardation, and eventually death among aquatic
organisms. In fishes, it causes histopathological
alteration of gills, esophagus, and brain. Therefore,
this present review discusses the toxic concentration
of nitrates, its adverse effects on the aquatic animals
and the assessment of the safe limit of nitrate that is
crucial to prevent chronic toxicity among inverte-
brates and fish.
Keywords Nitrate toxicity· agricultural run-off·
methemoglobinemia· fertilizers· histopathological
alteration· anthropogenic pollution· food chain
Highlights
• Environmental pollution from nitrate is getting worse
and is harming health of aquatic ecosystem.
• Nitrate causes growth reduction, histopathological
changes, neurotoxicity, endocrine disruption, and
ultimately death to aquatic organisms.
• Nitrate disrupts thyroid function, causes cancer,
congenital cardiac defect, and methemoglobinemia in
infants, fishes.
P.Banerjee· P.Garai· N.C.Saha(*)· P.Sharma
Fishery andEcotoxicology Research Laboratory
(Vice-Chancellor’s Research Group), Department
ofZoology, The University ofBurdwan, Pin, Burdwan,
WestBengal-713104, India
e-mail: prof.ncshavcbu@rediffmail.com
S.Saha
Department ofZoology, Sundarban Hazi Desarat College,
South 24 Pargan, Darjeeling, WestBengalas-743611, India
A.K.Maiti
Mitochondrial Biology andExperimental Therapeutics
Laboratory, Department ofZoology, University ofNorth
Bengal, P.O. N.B.U., Raja Rammohunpur, District -,
Darjeeling, WestBengalPin-734013, India
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1 Introduction
Nitrogen is one of the primary constituents for bio-
molecules including DNA, RNA, proteins, chloro-
phyll, etc. Although gaseous nitrogen (N2) is very
abundant in the atmosphere, it is largely inacces-
sible to most organisms in this form. Inorganic and
bioavailable nitrogen is present in various forms like
NO3-, NH4+ and NO2-. These compounds are inter-
related via the nitrification cycle. Ammonia is a
metabolic bi-product directly excreted into the water
(Camargo et al., 2005; Romano and Zeng, 2013).
Ammonia is converted into nitrites and subsequently
nitrates through nitrification by naturally occurring
bacteria Nitrosomonas and Nitrobacter, as follows:
In an aquatic and terrestrial ecosystem, the con-
centration of bioavailable nitrogenous compounds is
maintained at a low level. The plants and microbes
assimilate those nitrogenous compounds. The limiting
resource of bioavailable nitrogen maintains a balance
between primary productivity and global carbon stor-
age. In the United States, the maximum concentration
level for nitrate as nitrate-nitrogen (NO3-N) in public
drinking water is 10 mg/l, which is nearly equivalent
to the WHO recommendation of 11.3 NO3-N or 50
mg/l as NO3 (Singh etal.,2022). In India, the permit-
ted limit for nitrate ions in drinking water is 45 mg/l
(Bureau of Indian Standards) (Agarwal etal.,2019).
However, due to different natural and anthropogenic
sources, the level of these nitrogenous wastes includ-
ing ammonia (NH4+), nitrite (NO2-), and nitrate
(NO3-) are increasing in the ecosystem and becom-
ing a global threat for the animal life due to the toxic
impact (Valencia-Castañeda et al., 2019; Chong,
2022).
Increased exposure to ammonia (NH4+) changes
metabolic status in aquatic vertebrates, impair
muscle contraction due to competition with potas-
sium ions present in the muscle membrane (Sinha
etal.,2012). It also causes neurotoxicity by depo-
larizing the neurons and depleting ATP, which can
lead to cell death (Rodrigues etal.,2014). Elevated
nitrite concentrations cause acute toxicity in aquatic
animals. Nitrite exposure affects blood parameters,
NH+
4
+CO2+1.5O2+Nitrosomonas NO
2
+H2O+H
+
NO
2
+0.5O2+Nitrobacter NO
3
leading to methemoglobin or ferrihemoglobin
hypoxia, and haemolytic anemia. It causes tissue
impairment and metabolism injure (Xiang et al.,
2010; dos Santos Silva et al., 2018). Nitrate can
enter the body of fish and crustaceans through dif-
fusion in the branchial epithelium (Jensen, 1996;
Stormer etal.,1996). Elevated nitrate concentration
in the body affects the food intake, growth rate (Sch-
ram etal.,2014; Stelzer & Joachim,2010), swim-
ming performance, reproductive capacity (Alonso
& Camargo,2013; Egea-Serrano & Tejedo,2014),
developmental alteration (Mallasen etal.,2003) and
survival rate (Camargo & Alonso,2006).
Nitrate toxicity to aquatic animals increases
with the increase of concentration of nitrate and its
exposure time (Camargo etal., 2005). The low pH
of water also enhances the effect of nitrate toxicity
on aquatic animals. At low pH, electrolytes such as
Na+ and Cl- are lost from the body, and to balance
the electrolytes metabolic energy is needed. There-
fore, simultaneous exposure to both low pH and
elevated nitrate concentration increases maintenance
costs and reduce maximum oxygen uptake, which
negatively impacts on growth and activity of animals
(Wood & Rogano, 1986, 1993). In contrast, water
salinity and increasing body size also cause a general
decrease in nitrate toxicity (Camargo etal.,2005).
Alteration in performance of aquatic animals in
nitrate toxicity is because of reduced oxygen-carrying
capacity of the blood. The oxygen-carrying pigments
hemoglobin and hemocyanin transformed into the
non-oxygen-carrying pigment methemoglobin, which
results in decreased oxygen levels in the blood. So,
the toxicity mechanism of nitrate is similar to that
of nitrite as nitrate is ultimately transformed into
nitrate in-vivo (Scott & Crunkilton, 2000; Cheng &
Chen,2002; Camargo etal.,2005).
Humans are exposed to environmental nitrate
through public drinking water supplies. Drinking
water nitrate concentration has increased in many
regions mostly due to the application of animal
manure and inorganic fertilizer in agricultural lands.
The safe level of nitrate in public water supply has
already been set to prevent infant methemoglobine-
mia, although other health issues were not considered.
The risk of various cancers, birth defects, thyroid dis-
ease, and other health damage can occur due to nitrate
intake through drinking water that increases the for-
mation of N-nitroso compounds (Ward etal.,2018).
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The major focus of this present review is to dis-
cuss the implications of elevated nitrate levels in
aquatic ecosystems and the acute toxic effect of
nitrate-N on aquatic invertebrates and fish. This
review also focuses on the link between nitrate con-
tamination in drinking water and adverse health out-
comes like methemoglobinemia, colorectal cancer,
thyroid disease, and neural tube defect in the human
population.
2 Source ofnitrate pollution andits
environmental fate
Some major sources of nitrogen compounds in the
aquatic ecosystem include atmospheric deposi-
tion, surface, and groundwater runoff from ferti-
lized agricultural lands, municipal and industrial
waste disposal, decaying plant debris, N2 fixation by
certain prokaryotes, etc. (Dauda et al., 2019; Xue
etal.,2016). Inorganic nitrogen can infiltrate aquatic
ecosystems from both point and nonpoint sources
resulting from human activity in addition to natural
sources (Howarth, 1988; Guildford & Hecky, 2000).
Due of their size and difficulty in control, nonpoint
sources are typically more important than point
sources (Howarth, 2005). Additionally, anthropogenic
inputs of organic and particulate nitrogen into the
environment can lead to inorganic nitrogen pollution
(Stevens etal.,2011; van den Berg etal.,2016). As
a result, inorganic nitrogenous compound concentra-
tions (NH4+, NO2, and NO3) in ground and surface
waters are rising globally, having a significant impact
on a variety of aquatic creatures and ultimately con-
tributing to the decline of freshwater, estuarine, and
coastal marine environments (Galloway & Cowling,
2002; Lacerda etal.,2018; Norton & Ouyang, 2019;
de Carvalho etal., 2021; Zhao et al.,2021). Nitrate
is added to act as a reservoir for nitrite (Lundberg
et al., 2009). The oxidation of human and animal
excrement causes nitrate to enter surface water and
groundwater as a result of agricultural operations
such the excessive use of nitrogenous fertilisers and
manures, wastewater treatment, and nitrate oxidation
(Mahvi etal.,2005; Sahoo etal.,2016). Nitrate lev-
els in surface and groundwater naturally range from
5-100 mg/l but can increase up to 500-1000 mg/l due
to natural and anthropogenic activities (Galloway
etal.,2004; Vitousek etal., 1997).
Although nitrate is typically thought of as a benign
substance, prolonged exposure to high nitrate levels
has significant effects on aquatic life (Isaza et al.,
2020b). The fate of nitrate is determined by the sur-
rounding environment and elements including the
presence of organic materials and rainfall. Nitroso-
monas transforms nitrate from nitrate in oxygen-
deficient water (WHO, 2016). The nitrogenous
wastes both organic as well as inorganic forms in
soil, decomposed primarily to give ammonia, sub-
sequently, oxidized to nitrite and nitrate (Bernhard,
2010). The nitrate released is drawn by plants which
are required for their growth, and building of complex
organic nitrogenous compounds (Fatta etal.,1999).
3 Toxicity toaquatic invertebrates
A predicted unimodal relationship states that nutri-
ent enrichment may cause a subsidy-stress effect. A
small number of nutrients prompt primary productiv-
ity, thereby, delivering advantage to the community
composition as well to biodiversity. Uncurbed nutri-
ents often lead to algal blooms, oxygen depletion, and
deteriorating habitat conditions creating environmen-
tal stress, and biodiversity loss (Niyogi etal.,2007).
The nitrate-nitrogen along with sediment and low
flows has been predicted to have cumulative stress on
freshwater communities (Wagenhoff etal.,2011; Pig-
gott etal.,2012). Nitrate toxicity to aquatic inverte-
brates depends on the nitrate concentration and expo-
sure time. Increasing body size, the salinity of water,
and environmental adaptation generally decreased the
toxic impact of nitrate on aquatic animals.
Soucek and Dickinson (2012) tested the 96 h LC50
value for two freshwater unionid mussels (Lampsilis
siliquoidea and Megalonaias nervosa), a fingernail
clam (Sphaerium simile), two stonefly species (Allo-
capnia vivipara and Amphinemura delosa), and an
amphipod (Hyalella azteca). They observed a wide
variety of sensitivity to nitrate, with the LC50 value
ranging from 357 to 937 mg of NO3-N/l. The nitrate
sensitivity order was as follows: L. siliquoidea>S.
simile>A. delosa>H. Azteca>A. Vivipara>M. ner-
vosa. Therefore, no clear trend in nitrate sensitiv-
ity for particular taxonomic groups was observed by
Soucek and Dickinson (2016).
Wang et al. (2020) examined the acute and
chronic toxicity of sodium nitrate to unionid mussel
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(Lampsilis siliquoidea) and a midge (Chironomus
dilutus and reported the midge as more sensitive to
nitrate compared to the unionid mussel. The mussel
and midge showed the median effect concentrations
(EC50) of 665 mg NO3-N/l and 189 mg NO3-N/l
respectively and chronic effect concentrations of 17
mg NO3-N/l and 9.6 mg NO3-N/l respectively. Yildiz
(2004) reported the acute toxicity range of nitrite
on narrow-clawed crayfish, Astacus leptodactylus,
between 22 and 70 mg/l after 48 hours (mean 29.43
mg/l) of exposure. Environmental chloride (100mg/l
chloride) elevated the toxicity of nitrite ranging
between 31-80 mg/l after 48 hours (mean 49.20 mg/l)
of exposure (Yildiz, 2004). Garai etal. (2022) investi-
gated the toxicity of nitrate on freshwater oligochaeta
(Annelida) worm Tubifex tubifex. The 96 h LC50 value
of nitrate to T. Tubifex is 664.38 mg/l. The LC50 val-
ues for different aquatic invertebrate species reported
by different investigator are denoted in Table1.
In order to investigate effect of ionic strength
on nitrate toxicity Baker et al. (2017) conducted a
chronic toxicity test for aquatic invertebrates Hya-
lella azteca, midges (Chironomus dilutes), daphnids
(Ceriodaphnia dubia) with different of ion concentra-
tion. The result explained that lower nitrate toxicity
associated with higher concentrations of major ions
in water. C. dubia was found to be the most sensi-
tive species, with IC25 values ranging from 13.8 to
47.5 mg/l NO3-N, as the increase of water hardness.
IC25 values of C. dilutus and H. azteca, were from
48.8 -178 mg/l NO3-N and 12.2 - 181 mg/l NO3-N
respectively, as the water hardness increases. Further,
Soucek and Dickinson (2016) have reported a chronic
nitrate toxicity test results in various chloride concen-
trations of water for two crustaceans Hyalella azteca
and Ceriodaphnia dubia. H. azteca appeared to be
very sensitive to nitrate exposure and C. dubia was
not being as sensitive. There was a clear relationship
between chloride concentration in water and chronic
nitrate toxicity in the case of H. Azteca, but this rela-
tionship was not established for C. dubia.
To understand the toxic impact of nitrate on marine
and freshwater invertebrates and to provide a gen-
eral nitrate sensitivity order, we have generated a spe-
cies sensitivity distribution (SSD) curve by consider-
ing available 96h LC50 values. SSD is a bell-shaped
distribution curve represents the species sensitivity
distribution to a particular environmental stressor (Post-
huma & de Zwart,2012). Among the aquatic inverte-
brate species taken, the sensitivity order for nitrate is
Hydropsyche occidentalis, Cheumatopsyche pettiti,
Lampsilis siliquoidea, Sphaerium simile, Amphine-
mura delosa, Potamopyrgus antipodarum, Hyalella
azteca, Allocapnia vivipara, Megalonaias nervosa,
Penaeus monodon and Crassostrea virginica respec-
tively (Fig.1). This SSD curve agreeing the nitrate sen-
sitivity data with higher ion concentration and showed
that freshwater invertebrates are more sensitive towards
nitrate exposure than marine invertebrates.
In addition to acute and chronic toxicity, the
question of whether nitrate accumulates in body
tissue arises. Cheng et al. (2002) investigated
nitrate build-up in different tissues of the penaeid
shrimp Penaeus monodon. After 24 h of expo-
sure to 3.646, 21.234 and 36.079 mM of nitrate,
the accumulation was measured in muscle (0.202,
0.854 and 0.980 μmol/g), hepatopancreas (0.330,
1.139 and 1.552 μmol/g), heart (0.527, 1.468 and
1.879 μmol/g), foregut (0.632, 2.195 and 3.341
μmol/g), gills (0.927, 2.398 and 3.325 μmol/g),
hemolymph (0.946, 3.327 and 3.948 μmol/g), eye-
stalk (1.214, 3.461 and 4.264 μmol/g) and mid-
gut (1.529, 3.343 and 5.239 μmol/g) respectively.
The concentration of nitrate in muscle was lowest,
and the midgut was highest among different tis-
sues tested. Taken together the accumulation was
increased directly with nitrate concentration in the
surroundings and the exposure time, except for
muscle. The investigation by Garai et al. (2022)
elucidated that the combined effect of physiologi-
cal stress biomarkers gradually increased with
increasing exposure time and nitrate in Tubifex
tubifex. The increased level of stress biomarker
during chronic exposure of nitrate indicates higher
oxidative stress response in T. tubifex.
4 Toxicity tofish
Nitrite toxicity to fish also varies with different exter-
nal and internal factors i.e. water quality, fish spe-
cies, body size, and individual fish susceptibility
(Kroupova etal.,2005).
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Table 1. Comparative toxicity of nitrate-nitrogen (NO3-N) to aquatic invertebrates
Species Developmental stage Aquatic medium Toxicological parameter (mg
NO3-N/l)
References
Hydropsyche occidentalis Early instar larvae
Early instar larvae
Early instar larvae
Late instar larvae
Late instar larvae
Late instar larvae
Freshwater
Freshwater
Freshwater
Freshwater
Freshwater
Freshwater
148.5 (72 h LC50)
97.3 (96 h LC50)
65.5 (120 h LC50)
183.5(72 h LC50)
109.0 (96 h LC50)
77.2(120 h LC50)
Camargo & Ward (1992)
Cheumatopsyche pettiti Early instar larvae
Early instar larvae
Early instar larvae
Late instar larvae
Late instar larvae
Late instar larvae
Freshwater 191.0 (72 h LC50)
113.5 (96 h LC50)
106.5 (120 h LC50)
210.0 (72 h LC50)
165.5 (96 h LC50)
119.0 (120 h LC50)
Camargo & Ward (1992)
Paracentrotus lividus Juveniles (2.7–5.9 g) Seawater 100 (15 days safe level) Basuyaux & Mathieu (1999)
Haliotis tuberculata Juveniles (12–14.4 g) Seawater 250 (15 days safe level) Basuyaux & Mathieu (1999)
Ceriodaphnia dubia Neonates (<24 h) Freshwater 374 (48 h LC50)
21.3(48 h NOEC)
42.6(48 h LOEC)
Scott & Crunkilton (2000)
Daphnia magna Neonates (<48 h) Freshwater 462(48 h LC50)
358 (48 h NOEC)
717 (48 h LOEC)
Scott & Crunkilton (2000)
Potamopyrgus antipodarum Adults (2.6–3.8 mm) Freshwater 535(96 h LC50) Alonso & Camargo (2003)
Lampsilis siliquoidea Juveniles (5 days old) Freshwater 357 (96 h LC50) Soucek & Dickinson (2012)
Megalonaias nervosa Juveniles (5 days old) Freshwater 937 (96 h LC50) Soucek & Dickinson (2012)
Sphaerium simile Juveniles (14 days old) Freshwater 371 (96 h LC50) Soucek & Dickinson (2012)
Allocapnia vivipara Late-instar nymphs. Terrestrial 836 (96 h LC50) Soucek & Dickinson (2012)
Amphinemura delosa Late-instar nymphs. Terrestrial 456 (96 h LC50) Soucek & Dickinson (2012)
Hyalella azteca Adults Freshwater 667 (96 h LC50) Soucek & Dickinson (2012)
Hyalella azteca Adults (7-9 days old) Freshwater 210 (96 h LC50 at chloride conc.
9.9 mg/l)
516 (96 h LC50 at chloride conc.
24.6 mg/l)
736 (96 h LC50 at chloride conc.
97.6 mg/l)
Soucek & Dickinson (2016)
Ceriodaphnia dubia Neonates (< 24 h old) Freshwater 665 (48 h LC50 at chloride conc.
10.1 mg/l)
671 (48 h LC50 at chloride conc.
24.9 mg/l)
502 (48 h LC50 at chloride conc.
48.7 mg/l)
453 (48 h LC50 at chloride conc.
96.6 mg/l)
Soucek & Dickinson (2016)
Hyalella azteca 6-8 days old amphipods Freshwater 124-622 (14 days LC50 with the
increase of water hardness)
Baker etal.(2017)
Chironomus dilutes Third-instar larvae Freshwater 114-342 (10 days LC50 as the
water hardness increases)
Baker etal.(2017)
Ceriodaphnia dubia < 24 h old daphnia Freshwater 62-127 (7 days LC50 as the water
hardness increases)
Baker etal.(2017)
Lampsilis siliquoidea Juveniles (6 days) Freshwater 665 (Acute EC50) Wang etal.(2020)
Chironomus dilutus Larvae (7 days) Freshwater 189 (Acute EC50) Wang etal.(2020)
Tubifex tubifex Adults Freshwater 664.381(96h LC50) Garai etal.(2022)
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Kincheloe et al. (1979) showed species-specific
early fry mortality at increasing nitrate concentra-
tion. At 20 mg/l of nitrate exposure, chinook salmon
egg and fry showed a significant increase in mortality
rate. Rainbow trout fry showed increased mortality at
10 mg/l of nitrate exposure. Early fry of coho salmon
and steelhead trout had no significant alteration in
mortality rate after increasing the dose of nitrate. The
early fry stage of lahontan cutthroat trout showed
significantly high mortality at 30 mg/l of nitrate con-
centration. LC50 values obtained due to exposure
of nitrate-nitrogen (NO3-N) to fishes are listed in
Table2.
In order to compare nitrate-nitrogen (NO3-N) to
different freshwater and marine fishes, we have gen-
erated a species sensitivity distribution (SSD) curve
by considering available 96 h LC50 values. Among
the freshwater and marine fish species taken, the
order of sensitivity for nitrate is Poecilia reticulates,
Monocanthus hispidus, Litopenaeus vannamei,
Raja eglanteria, Trachinotus carolinus, Micropterus
treculi, Oncorhynchus tshawytscha, Pimephales
promelas, Ictalurus punctatus, Rachycentron cana-
dum, Lepomis macrochirus, Centropristis striata
and Pomacentrus leucostritus respectively (Fig. 2).
Poecilia reticulates is a freshwater fish is the most
sensitive fish to nitrate. On another hand, Centro-
pristis striata and Pomacentrus leucostritus are two
marine fish species have very high LC50 value as
compared to other freshwater fish. So overall, this
SSD curve also explains that marine fish species
are generally less sensitive towards nitrate toxic-
ity than freshwater fish species. Yildiz etal.(2006)
reported that nitrite exposure in the range of 0.50
and 1.38 mg/l caused a rise in methemoglobin lev-
els in Nile tilapia (Oreochromis niloticus), however,
methemoglobin percentages ranging from 16% to
42% represented a mild methemoglobinemia. Yildiz
etal.(2006) also observed considerable lowering of
hematocrit and haemoglobin levels in Nile tilapia
after exposure to nitrite.
Freshwater fishes take up nitrite through gills,
which leads to a high rate of accumulation. Sea-
water fishes take nitrite through both gills and
intestines (Jensen,2003). Histopathological altera-
tion of gills, esophagus, and brain was observed
in acute exposure to sub-lethal concentrations of
nitrate. Gill revealed lamellar fusion and hyperpla-
sia of epithelium and lamellar shortening induced
by necrosis. The esophagus showed hyperplasia
of mucus cells and epithelium. The proliferation
of glial cells and satellitosis (microglial cells sur-
rounding neurons with swollen and prenecrotic
neurons) were observed in the brain (Rodrigues
et al., 2011). Davidson et al. (2014) observed
slow growth and decreased survival rate in juve-
nile rainbow trout Oncorhynchus mykiss at high
nitrate (80-100 mg/l) exposure. Luo etal.(2016)
also observed decreased growth rate, develop-
mental retardation and increased mortality rate in
rare minnow Gobiocypris rarus to a high dose of
nitrate exposure.
Fig. 1 Species sensitiv-
ity distribution curve
for aquatic invertebrates
to nitrate toxicity. The
black line denotes central
tendency and blue lines
denotes 95% confidence
intervals
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Nitrate transfer across erythrocytes membrane
causes oxidation of hemoglobin to methemoglobin
(metHb) which impairs the blood oxygen trans-
port (Cameron, 1971). Smith and Williams (1974)
reported methemoglobinemia and a 40% mortal-
ity rate after nitrite exposure in Rainbow Trout and
Chinook Salmon. Gisbert etal. (2004) reported acute
nitrite toxicity in Siberian sturgeon yearlings which
caused severe methemoglobinemia, change in plasma
electrolyte imbalance, and kidney Na+–K+ ATPase
activities. At acidic pH, chronic exposure to nitrate
(50 mg/l and 100 mg/l) in juvenile spangled perch,
reduced the functional performance and compro-
mised the blood oxygen-carrying capacity due to the
Table 2. Comparative toxicity of nitrate-nitrogen (NO3-N) to fishes
Species Developmental stage Aquatic medium Toxicological parameter (mg
NO3-N/l) References
Poecilia reticulatus Fry Freshwater 267 (24 h LC50)
219 (48 h LC50)
199 (72 h LC50)
191 (96 h LC50)
Rubin & Elmaraghy (1977)
Lithognathus mormyrus Fingerlings Seawater 3450 (24 h LC50) Brownell (1980)
Diplodus sargus Fingerlings Seawater 3560 (24 h LC50) Brownell (1980)
Heteromycteris capensis Fingerlings Seawater 5050 (24 h LC50) Brownell (1980)
Micropterus treculi Fingerlings Freshwater 1261 (96 h LC50) Tomasso & Carmichael (1986)
Pimephales promelas Larvae Freshwater 1341 (96 h LC50) Scott & Crunkilton (2000)
Catla catla Freshwater 1565.43 (24 h LC50) in static
system
1484.08 (24 h LC50) in con-
tinuous flow-through system
Tilak etal. (2021)
Rachycentron canadum Juvenile Seawater 2407 (24 h LC50)
1829 (96 h LC50)Rodrigues etal.(2011)
Cyprinus carpio Juvenile Freshwater 1075.10 (24 h LC50) in static
system
967.63 (24 h LC50) in continu-
ous flow-through system
Rodrigues etal.(2011)
Litopenaeus vannamei Juvenile Seawater 900 (96 h LC50) at a salinity
concentration 3 g/l. Valencia-Castañeda etal.(2019)
Fig. 2 Species sensitivity
distribution curve for fishes
to nitrate toxicity. The
black line denotes central
tendency and orange lines
denotes 95% confidence
intervals
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reduction of hematocrit value, hemoglobin content,
an increase of methemoglobin concentration (Isazaet
al., 2020a). Nitrate accumulation in the blood plasma
lead to depletion of chloride ions and caused potas-
sium ion loss from skeletal muscle and erythrocytes,
resulted in a reduction in cell volume and extracellu-
lar hyperkalemia (Knudsen & Jensen,1997).
Aggergaard and Jensen (2001) reported that nitrite
exposure to rainbow trout Oncorhynchus mykiss,
increased the heart rate and influenced the cardio-
respiratory function. Fish exposed to increased nitrate
concentration showed higher creatinine levels in
serum and lower chloride levels compared to the con-
trol fish (Hrubec etal.,1997). Nitrite can mimic nitric
oxide and thereby inhibit the processes regulated by
local hormones (Jensen, 2003). Nitrate exposure to
zebrafish embryos showed neurotoxicity and acted as
an endocrine disruptor possibly by the conversion to
nitric oxide to downregulate the activity of dopamin-
ergic neurons (Jannat etal.,2014).
5 Nitrate toxicity anddisease progression
The use of high nitrate-containing drinking water
is a very common risk factor for methemoglobine-
mia from fishes to human. Fish gills actively carry
nitrates, which easily oxidise haemoglobin to produce
methemoglobin. The detailed molecular mechanism
of methemoglobinemia studied in human. The hemo-
globin (Fe2+) of the affected individuals transforms
to methemoglobin (Fe3+). 1.8 Å crystal structure of
human hemoglobin (PDB: 3D7O) shows the nitrite
anion binds at the sixth coordination position at the
ferric (Fe3+) moity of heme, hence become unable
to transform oxygen (Fig.3a-b). It causes ‘blue-baby
syndrome’ to the affected infants. The principal char-
acteristics of this syndrome are cyanosis (blue-grey
skin colour) and become irritable or lethargic. If not
treated properly; this condition can progress to some
other severe symptoms like loss of consciousness, sei-
zures, and ultimately death (Knobeloch etal.,2000).
Infants with the age group of < 3 months are most
susceptible to methemoglobinemia than adults
because of less synthesis of NADH-cytochrome b5
reductase, which is the key enzyme to convert meth-
emoglobin back to haemoglobin (Savino etal.,2006).
Methemoglobinemia causes severe hypoxia in fishes
that can result in abrupt death. Fish blood with high
methemoglobin levels appears is brown in color, also
refers to "brown blood illness" (Chong,2022).
In addition to methemoglobinemia, nitrate expo-
sure also causes cancer in various organs like the
oesophagus, bladder, stomach, and colon (Ward
et al., 2018). Nitrate possibly converts to nitrite
under the condition of gastric achlorhydria and sub-
sequently transforms into nitrosamines-substances,
which is known for causing cancer in animals (Magee
& Barnes,1967). Morales-Suarez-Varela etal.(1995)
Fig. 3 Structure of methemoglobin. aStructure of hemoglobin
protein shown in surface. Structure of heme bind with ortho-
nitrito (ONO) shown in steak. bZoomed in view of structure
of ferric- heme- (ONO). (PDB ID: 3D7O)
Water Air Soil Pollut (2023) 234:333
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reported a relationship between nitrate exposure and
mortality rate in cancer of different age groups of peo-
ples in the province of Valencia, Spain. They observed
an increased mortality rate due to the relatively high
risk of gastric and prostate cancer at the nitrate con-
centration > 50 mg/l in the drinking water. The per-
son of age group 55-75 years, showed relative gastric
cancer risk 1.91 for males and 1.81 for females. In the
case of prostate cancer, the elevated relative risk was
1.86 and 1.80 for the age group of 55-75 and > 75
years respectively. Taneja etal.(2017) studied the case
of gastrointestinal cancer (GI) in a population of 234
individuals from a rural area of Nagpur and Bhandara
district of India. They reported 78 cases of GI cancer
in 2 years period due to nitrate exposure from drink-
ing water at the concentration of > 45 mg/l. Espejo-
Herrera etal. (2015) reported a high risk of bladder
cancer in Spain due to long-term exposure to nitrate-
contaminated drinking water.
Ingestion of nitrate from contaminated drinking
water, also affects the function of the thyroid gland,
leading to the alteration of thyroid hormone concen-
tration. Nitrate competitively inhibits the sodium-
iodine symporter of thyroid follicles and thereby
blocks the iodine intake by the thyroid gland. There-
fore, ingestion of nitrate compromises the thyroid
hormone synthesis, causes thyrotropin elevation.
Ward etal.(2010) reported an increased risk of thy-
roid cancer in the population taking high concentra-
tions of nitrate (>5 mg/L nitrate-N) through public
water supply for a longer duration. Consumption of
drinking water with high nitrate contamination (> 50
mg/l) caused the development of hypertrophy (van
Maanen etal.,1994). Tajtáková etal.(2006) reported
increased thyroid volume and a higher frequency of
thyroid disorder in schoolchildren from high nitrate
contaminated areas compared to low nitrate contami-
nated areas. Aschebrook-Kilfoy etal.(2012) observed
that the exposure to nitrate at the concentration > 6.5
mg/l caused a high risk in subclinical hypothyroid-
ism for women. An increased risk of type 1 diabetes
mellitus was also found in people exposed to a high
nitrate concentration of > 40-80 mg/l (Bahadoran
etal.,2016).
Cedergren etal. (2002)reported an increased risk
for a congenital cardiac defect in a population after
exposure to nitrate contaminated drinking water.
They have collected data from 58,669 women, who
have taken nitrate-contaminated drinking water from
the public water supply. Among the infants born, 753
showed cardiac defects.
Bukowski et al. (2001) investigated a major
impact of groundwater nitrate concentration on
intrauterine growth retardation and prematurity on
Prince Edward Island. Among 4098 controls from
the database, 210 cases showed intrauterine growth
retardation and 336 cases showed premature birth.
Maternal exposure to nitrate through drinking
water during pregnancy reduced the weight and
length of offspring which are the markers of intra-
uterine growth (Coffman et al., 2021). Tabacova
etal.(1997) investigated the pregnant women, who
have taken drinking water from an area contami-
nated by oxidized nitrogen compounds, showed
complications in pregnancy. Among them, 67% of
cases showed anaemia, 33% of cases had premature
labour, and 23% of cases showed preeclampsia.
Tabacova etal.(1998) showed that exposure to oxi-
dized nitrogen compounds is linked with increased
risk in neonatal health and more lipid peroxidation
in both maternal and cord blood. A risk in central
nervous system malformation due to nitrate expo-
sure in drinking water was reported in New Brun-
swick, Canada by Arbuckle etal.(1988).
6 Concluding remarks
The data presented in this present review suggest
that nitrate toxicity due to natural and anthropo-
genic sources may seriously affect both aquatic ani-
mals and human health. Nitrate concentrations in
the water resources are increasing due to the use of
nitrogen fertilizer and animal agriculture. Therefore,
a safe level of nitrate as recommended by WHO
guidelines should be maintained in the environment
to protect living organisms. National and global
efforts are needed to mitigate the nitrate concentra-
tion in water resources. Some of such water quality
protection agencies which prevent nitrate pollution
in surface and groundwater are International Nitro-
gen Initiative and EU Nitrates Directive (Musac-
chio etal.,2020; Bowen etal., 2005). Efforts of the
EU Nitrates Directive include identification of most
exposed areas, the establishment of good agricul-
tural practices, crop rotation, national observation,
and reporting that decrease the nitrate concentration
in groundwater in some European countries (Hansen
Water Air Soil Pollut (2023) 234:333
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etal.,2011). Although in the U.S., the application of
nitrogen fertilizer in the crop field is not regulated and
efforts to maintain the nitrate concentration in surface
and groundwater are voluntary (Dinnes etal.,2002).
Long-term studies are necessary to verify and
enhance the suggested safe amount of nitrate for
aquatic species notwithstanding the endorsement of
this level. Further research is required into the effects
of water parameters such as pH, temperature, hard-
ness, salinity, dissolved oxygen content, and other
chemical components on the toxicity of nitrate for
aquatic species. In addition, aquatic species engage
in a variety of biotic interactions, including as com-
petition, parasitism, and predation. In order to com-
prehend how nitrate contamination affects biotic
interactions and natural selection for aquatic organ-
isms, field and laboratory investigations are required.
For the human population, the most adverse health
effect occurs due to the intake of nitrate-contaminated
drinking water and an increase of endogenous nitro-
sation. Some recent studies have identified subgroups
of the population with the increased potentiality of
endogenous nitrosation. However, a direct method
is needed to assess the individuals. New tools are
now available for epidemiologic studies to quantify
the bacterial DNA, the relative abundance of oral
microbiomes, and to characterize them (Vogtmann
etal.,2017; Sinha etal.,2017). More studies are also
needed to understand the nitrate-reducing capacity of
oral microbiomes and to determine the factors that
can modify their capacities like oral hygiene, food,
and periodontal disease.
Most countries throughout the world, including
the United States, South Korea, Europe, and India,
are considered nitrate contaminated as the concentra-
tions detected there exceed the allowed and accept-
able limits set by environmental agencies such as the
USEPA, WHO, and others. Several studies have been
undertaken in India to determine the extent of nitrate
contamination in ground and surface water habitats.
As a result, the only way to lessen the related health
risks is to remediate nitrate-contaminated soil and
water. Reverse osmosis, chemical denitrification, bio-
logical denitrification, electro dialysis and adsorption
are some of the processes that have proved effective
and are now in use. The employment of greener and
newer ways to remove nitrate, such as various nano-
composites, halloysite nanotubes, and nanorods, may
improve nitrate removal efficiency. The limitations of
recycling and separation from water can be overcome
by immobilising these nanocomposites or nanotubes
on a membrane. Sensing approaches might appear to
be a more suitable and reliable tool for quantifying
and estimating nitrate ions in soil and water. How-
ever, further studies are needed to develop advanced
systems for removing nitrate from the environment
and sensing its presence when it exceeds permissible
levels.
Acknowledgments We are thankful to the Department of
Zoology, The University of Burdwan for providing the labora-
tory facilities.
Data Availability The datasets generated during and/or
analysed during the current study are available from the cor-
responding author on reasonable request.
Declaration
Conflict of Interest The authors declare no competing inter-
ests.
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Nitrite–nitrate toxicity in finfish is a basic problem to avoid in maintaining good water quality necessary for healthy fish. This chapter provides information on the etiological process, pathophysiology, and testing of nitrite–nitrate poisoning, which enables appropriate diagnosis and control of the condition. There are fish species differences in susceptibility to nitrite–nitrate, which determines the safe levels of exposure that should be applied in the culture of freshwater compared to marine fish.
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Nitrogen is one of the major components of all biological systems. In the aquatic ecosystem, it is available in the inorganic forms of ammonia, nitrite, and nitrate. Climate change due to global warming and anthropogenic misconduct increases the amount of nitrogen in rivers and other aquatic ecosystems. That revolve nitrate pollution is a serious global concern. The benthic macroinvertebrates, which are necessary for maintaining the structure and functioning of the aquatic ecosystem, are the primary victims of this pollution. The determination of nitrate toxicity on the benthic oligochaete worm Tubifex tubifex is primarily detailed in this article along with enzymatic, toxicokinetic and statistical evidences. The acute toxicity of nitrate for 96 h of exposure on the worm is reported to be 664.38 mg/l. The nitrate-treated worms during acute exposure displayed certain behavioural abnormalities such as erratic movements, wrinkling tendency, profuse mucus secretion, and lower clumping tendency. The effect of sublethal concentration (10% and 20% of 96 h LC50) of nitrate on differential expression of oxidative stress enzymes was also investigated over a period of 14 days exposure. The nitrate exposed worms showed an increased level of MDA that signifies lipid deterioration. The integrated biomarker response (IBR) assessment revealed that the combined effect of stress biomarkers increased gradually with increasing exposure time and nitrate concentration. The maximum integrated biomarker response was observed at 14th day of T2 concentration (20% of 96 h LC50 value) of nitrate. Species sensitivity distributions (SSD) illustrated the toxic impact of nitrate on T. tubifex in the aquatic ecosystem with respect to other aquatic invertebrate species. The toxicokinetic-toxicodynamic studies through GUTS modelling applied to predict the LC50 value for a longer period of nitrate exposure on the worm are reported to be 403.6 mg/l. It is concluded that nitrate exposure detrimentally affects the survival rate and alter oxidative stress biomarkers in T. tubifex. Evaluation of nitrate toxicity in T. tubifex will be useful to determine the acceptable concentration of nitrate for aquatic organisms.
Article
Nitrate pollution is eminent in almost all the developing nations as a result of increased natural activities apart from anthropogenic pollution. The release of nitrates in more than critical quantities into the water bodies causes accretion impacts on living creatures, environmental receptors, and human vigour by accumulation through the food chain. Nitrates have recently acquired researchers' huge attention and extend their roots in environmental contamination of surface and groundwater systems. The presence of nitrate in high concentrations in surface and groundwater triggers several health problems, for instance, methemoglobinemia, diabetes, eruption of infectious disorders, harmfully influence aquatic organisms. Sensing nitrate is an alternate option for monitoring the distribution of nitrate in different water bodies. Here we review electrochemical, spectroscopic, and electrical modes of nitrate sensing. It is concluded that, among the various sensors discussed in this review, FET sensors are the most desirable choice. Their sensitivity, ease of use and scope for miniaturization are exceptional. Advanced functional materials need to be designed to satiate the growing need for environmental monitoring. Different sources of nitrate contamination in ground and surface water can be estimated using different techniques such as nitrate isotopic composition, co contaminants, water tracers, and other specialized techniques. This review intends to explore the research work on remediation of nitrate from wastewater and soil using different processes such as reverse osmosis, chemical denitrification, biological denitrification, ion exchange, electrodialysis, and adsorption. Denitrification proves as a promising alternative over previously reported techniques in terms of their nitrate removal because of its high cost-effectiveness.
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Ocean warming has severe impacts on coral reef ecosystems with frequent incidences of coral bleaching. In addition, eutrophication poses an increasing threat to coral reef environments and has been found to increase the vulnerability of corals to thermal bleaching. Eutrophication has accelerated in recent years with coastal nutrient loads expected to continue to increase under global change. However, the mechanisms by which nutrient pollution affects corals and coral reefs are still under debate, in particular with regard to nitrogen. The main objective of this paper is to review mechanisms by which nitrogen pollution affects coral health and corresponding strategies to reduce the impact of nitrogen pollution. Different coral species possess varying tolerance thresholds for nitrogen enrichment and corals show differential responses to enrichment with nitrate and ammonium. Nitrate assimilation increases oxidative stress in corals, promotes growth of the phototrophic symbionts in corals, and induces phosphate starvation in these symbionts, which further impairs the symbiosis. In contrast, a moderate supply of ammonium is mostly beneficial for coral development. In addition, combined nitrogen and phosphorous enrichment can indirectly compromise coral health by enhancing macroalgae growth and increasing the incidence of coral diseases caused by predation on corals. It must be realized that both levels of nutrient pollution and the stoichiometric ratios of C: N: P: Fe availabilities determine the ultimate effect of nutrients on coral health. We confirm the strategy to conserve coral reefs via coral-targeted water quality management, in particular by including a reduction of the nitrate influx and by proper management of fish stocks to facilitate healthy reef ecology.
Article
Elevated nitrate (NO3) and sulfate (SO4) in surface water are a global concern and studies are needed to generate toxicity data to develop environmental guideline values for NO3 and SO4. The present study was designed to fill existing gaps in toxicity databases by determining the acute and/or chronic toxicity of NO3 (tested as NaNO3) to a unionid mussel (Lampsilis siliquoidea), a midge (Chironomus dilutus), a fish (rainbow trout Oncorhynchus mykiss), and 2 amphibians (Hyla versicolor, Lithobates sylvaticus), and determine the acute and/or chronic toxicity of SO4 (tested as Na2SO4) to 2 unionid mussels (L. siliquoidea, Villosa iris), an amphipod (Hyalella azteca), and 2 fish species (fathead minnow Pimephales promelas, O. mykiss). Among the different test species, acute NO3 EC50s ranged from 189 to >883 mg NO3‐N/L and chronic NO3 EC20s based on the most sensitive endpoint ranged from 9.6 to 47 mg NO3‐N/L. The midge was the most sensitive species and the trout was the least sensitive species in both acute and chronic NO3 exposures. Acute SO4 EC50s for the 2 mussel species (2071 and 2064 mg SO4/L) were similar to the EC50 for the amphipod (2689 mg SO4/L) whereas chronic EC20s for the 2 mussels (438 and 384 mg SO4/L) were >2‐fold lower than the EC20 of the amphipod (1111 mg SO4/L), indicating the high sensitivity of mussels in chronic SO4 exposures. However, the fathead minnow, with an EC20 of 374 mg SO4/L, was the most sensitive species in chronic SO4 exposures while the rainbow trout became the least sensitive species (EC20 >3240 mg SO4/L). The high sensitivity of fathead minnow was consistent with the finding in a previous chronic Na2SO4 study. However, the EC20 values from the present study conducted in test water containing a higher potassium concentration (3 mg K/L) were >2‐fold greater than those in the previous study at a lower potassium concentration (1 mg K/L), which confirmed the influence of potassium on chronic Na2SO4 toxicity to the minnow. This article is protected by copyright. All rights reserved.
Article
Nutrient effluents from urban and agricultural inputs have resulted in high concentrations of nitrate in freshwater ecosystems. Exposure to nitrate can be particularly threatening to aquatic organisms, but a quantitative synthesis of the overall effects on amphibians, amphipods and fish is currently unavailable. Moreover, in disturbed ecosystems, organisms are unlikely to face a single stressor in isolation, and interactions among environmental stressors can enhance the negative effects of nitrate on organisms. Here, the effects of elevated nitrate on activity level, deformity rates, hatching success, growth and survival of three taxonomic groups of aquatically respiring organisms are documented. Effect sizes were extracted from 68 studies and analysed using meta-analytical techniques. The influence of nitrate on life-stages was also assessed. A factorial meta-analysis was conducted to examine the effect of nitrate and its interaction with other ecological stressors on organismal survival. Overall, the impacts of nitrate are biased towards amphibians (46 studies) and fish (13 studies), and less is known about amphipods (five studies). We found that exposure to nitrate translates to a 79% decrease in activity, a 29% decrease in growth, and reduces survival by 62%. Nitrate exposure also increases developmental deformities but does not affect hatching success. Nitrate exposure was found to influence all life-stages except embryos. Differences in the sensitivity of nitrate among taxonomic groups tended to be negligible. The factorial meta-analysis (14 amphibians and two amphipod studies) showed that nitrate in combination with other stressors affects survival in a non-additive manner. Our results indicate that nitrate can have strong effects on aquatic organisms and can interact with other environmental stressors which compound the negative effects on survival. Overall, the impacts of nitrate and additional stressors are complex requiring a holistic approach to better conserve freshwater biodiversity in the face of ongoing global change.