Zhang Jiangyi

Chinese Academy of Sciences | CAS · Division of Engineering Geology and Water Resources

With the intensification of human activities, nitrate pollutants in groundwater are receiving increasing attention worldwide. Especially in the arid Nile Delta of Egypt, groundwater is one of the most valuable water resources in the region. Identifying the source of nitrate in groundwater with strong human disturbances is important to effective wat...

Alpine rivers originating from the Tibetan Plateau (TP) contain large amounts of water resources with high environmental sensitivity and eco-fragility. To clarify the variability and controlling factors of hydrochemistry on the headwater of the Yarlung Tsangpo River (YTR), the large river basin with the highest altitude in the world, water samples...

River cascade development is one of the human activities that have the most significant impact on the water environment. However, the mechanism of cascade development affecting river hydrochemical components still needs to be further studied. In this study, water quality index(WQI), positive matrix factorization(PMF) model and multivariate statisti...

Investigations of the hydrological processes of the Yarlung Zangbo River (YZR), a sizeable highland river on the southern margin of the Tibetan Plateau (TP), face challenging constraints owing to the complexities in the water sources and cycle pathway. A total of 156 stream water samples from the YZR Basin were collected and analyzed to elucidate o...

Under the impacts of climate change and the expansion of anthropogenic activities, changes in global nitrogen cycle may be most dramatic at high altitudes. However, a large basin scale understanding of nitrogen cycling is still lacking for the Tibetan Plateau. Taking advantage of the multiple-isotopic approach, we explored the nitrogen cycling proc...

Germanium/Silicon (Ge/Si) ratio is a common proxy for primary mineral dissolution and secondary clay formation yet could be affected by hydrothermal and anthropogenic activities. To decipher the main controls of riverine Ge/Si ratios and evaluate the validity of the Ge/Si ratio as a weathering proxy in the Tibetan Plateau, a detailed study was pres...

High levels of nitrogen (N) in urban rivers are a global concern, but key evidence is lacking about their driving forces, which has limited the efficiency of water quality management and the sustainability of water resources. In this study, multiple stable isotopes (δ¹⁵N, δ¹³C, δ¹⁸O, and δD) and an isotopic mixing model were used to reveal the caus...

To date, basin-scale understanding of nitrogen (N) cycling is lacking, which undermines riverine N pollution control efforts. Applying a multiple-isotopic approach, this study provided insights into the impacts of climate and anthropogenic activities on the N cycling at a basin scale. The isotopic compositions of the river water were regulated by a...

Nitrogen pollution is a serious environmental issue in the Danjiangkou Reservoir region (DRR), the water source of the South-to-North Water Diversion Project of China. In this research, seasonal surveys and a bi-weekly time series survey were conducted in the Qihe River Basin, one of the most densely populated agricultural basins in the DRR. Hydroc...

The Gudui geothermal field records the highest temperature at equivalent borehole depths among the mainland hydrothermal systems in mainland China. Located about 150 km southeast of Lhasa City, the capital of Tibet, the Gudui geothermal field belongs to the Sangri–Cuona rift belt, also known as the Sangri–Cuona geothermal belt, and is representativ...

Rainwater samples from Shenzhen in south China were collected over the period of a year, and the chemical compositions were measured with the main purpose of understanding the acidification of rainwater and the controlling factors. The pH value of precipitation ranged from 3.72 to 6.77, with a volume-weighted mean (VWM) value of 4.29, and the acid...

Magnesium isotope behavior in dissolution and precipitation reactions during chemical weathering have been well documented. However, mechanisms of mineral dissolution and precipitation impact on the riverine Mg isotope composition under different climatic and geology background are not well constrained, which limits Mg isotope application in weathe...

Major ions and Sr isotope compositions of waters in the Yalong River basin in the eastern Tibetan plateau were investigated to explore the sources of dissolved loads and the controls on chemical weathering rates. Measured radiogenic ⁸⁷ Sr/ ⁸⁶ Sr ratios of water samples are most likely derived from the weathering of metamorphic carbonates or the Pre...

In this work, a reliable method based on CH4-Ar mixed gas plasma DRC-ICP-MS was developed for direct determination of trace Ge in river samples. The interfering polyatomic ions ³⁶Ar2⁺, ⁵⁶Fe¹⁶O⁺, ⁴⁰Ar³²S⁺, ⁴⁰Ar¹⁶O2⁺, ⁵⁵Mn¹⁶OH⁺ on ⁷²Ge⁺ determination could be reduced by 68% using the DRC with CH4 as the reaction gas. In addition, the CH4 gas was intr...

Mountain-front recharge, including mountain block recharge and stream seepage, is important for basin aquifers. With the construction of reservoirs in mountainous areas and the recurrent seepage problems of dams, reservoir seepage might become another type of mountain-front recharge. This study identified the recharge sources of groundwater beneath...

In this work, a valid method was developed for the determination of Ag in large geological samples using dynamic reaction cell (DRC) ICP-MS after extraction from boiling aqua regia. In the extraction procedure, over 90% of the Zr and Nb which produces oxide and hydroxide interferences was removed. The residual Nb-oxide and Zr-hydroxide interference...

In this study, a reliable method based on the combination of ion molecule reaction ICP-MS and addition of a CH4 plasma modifier technique was established for the direct determination of Se in Ca-rich groundwater samples. The ⁸⁰Se⁺ was oxidized to ⁸⁰Se¹⁶O⁺ by O2, and detected at m/z 96. Under the optimized conditions (O2 flow rate = 0.6 mL min⁻¹ and...

Groundwater is the only water source of the shelterbelt along the Taklimakan Desert Highway in northwestern China. Understanding the hydrochemical zoning characteristics, material source, and hydrochemical processes of this desert groundwater is important for rational groundwater exploitation. Meanwhile, determining the location of the dividing bou...

A simple method based on the dynamic reaction cell (DRC) technology to eliminate the spec- tral interference in the simultane- ous determination of trace cadmium and silver in soil sam- ples by ICP-MS was established. Under the optimized O2 flow rate (2.7 mL min-1) and the DRC rejec- tion parameter RPq (0.8 for Ag, 0.7 for Cd), the interference cau...

Based on analysis of groundwater hydrogeochemical and isotopic data, this study aims to identify the recharge sources and understand geochemical evolution of groundwater along the downstream section of the Shule River, northwest China, including two sub-basins. Groundwater samples from the Tashi sub-basin show markedly depleted stable isotopes comp...

As the demand for energy grows steadily and fossil fuels are depleted gradually, nuclear power will continue to play an important role in meeting energy needs in the future. Uranium, as the fuel for nuclear power generation, has experienced the increase in production in recent years. Acid in situ leach uranium mining is an effective and popular tec...

A solid phase preconcentra- tion method has been developed using hydroxyl multi-wall carbon nanotubes (MWNTs) as the absorbent. The method was opti- mized for the determination of rare earth elements (REEs) in deep groundwater samples by inductively coupled plasma mass spectrometry (ICP-MS). The effects of the experimental para- meters, including p...

Simultaneous determination of elements in groundwater (ng L-1 to g L-1) in single analysis by DRC ICP-MS was developed. The technique of extended dynamic range based on DRC could be able to detune the signal response of selective elements to enable incorporation of high concentration elements (outside of the ion detector' dynamic range to 1e9 cps)...

In this study, elimination of the memory effects of B, Br, I, Hg, Bi, and Sb and their simultaneous determination in groundwater sampls were studied in detail by inductively coupled plasma mass spectrometry (ICP-MS). The memory effects were eliminated with a wash run of 4.5 minutes with a 0.5% NH 3-H2O/0.5% NaF/10 mg I-1 Au solution. Good agreement...

Understanding sources of recharge and mechanisms for hydrogeochemical evolution of groundwater in the Shule River basin, an arid inland river basin in northwestern China, is essential for successful water resource management. Sources of water and associated groundwater recharge processes were investigated using hydrogeological, hydrogeochemical, an...

A new procedure for the direct determination of total arsenic in high salinity and CaCl2 type groundwater has been developed. In order to remove the polyatomic interferences (40)Ar(35C)l(+), (CaCl+)-Ca-40-Cl-35, K-39(36) Ar+ arising from the direct analysis of high salinity and CaCl2 type groundwater, As-75(+), the mass for general detection, was e...

Direct determination of ng g− 1 level of selenium by ICP-MS is complicated because of the presence of serious spectral interferences, and the high first ionization energy of Se (9.75 eV) also results in low analytical sensitivity. In this study, a reliable method for accurate determination of Se in biological samples using CH4-Ar mixed plasma-DRC-M...

A method was established to determine the chlorofluorocarbons (CFCs) in groundwater by purge and trap and secondary cold trap coupled with gas chromatography/mass spectrometry (GC-MS). The groundwater samples were processed with absorption/thermal desorption/cold trap/thermal desorption, and GC-MS was used for quantitative and confirmatory analysis...

The Taklimakan desert is known as the largest dunefield in China and also as the world's second largest shifting sand desert. The Tarim Desert Highway, which is the first highway to cross the Taklimakan desert, was built for the purpose of oil and gas resources extraction in the Tarim area, as well as for the development of the southern area of the...

A robust method for trace element determination in food samples by addition of methane to the plasma of a dynamic reaction cell mass spectrometer (CH(4) mixed plasma-DRC-MS) was developed. Addition of 3 mL min(-1) methane to Ar-plasma eliminates the signal suppressions of various elements (As, Se, Hg, etc.) due to the high concentration of nitric a...

Trace levels of arsenic (As) in soil samples can be determined by conventional ICP-QMS with closed vessel digestion, but always suffer from interference of ions originating from the complicated matrix, mainly including 40Ca35Cl+, 40Ar35Cl+, 39K36Ar+, 150Nd2+, 150Eu2+ and 150Sm2+etc. In this study, 75As+, the mass for general detection, was effectiv...

Silver is subject to significant spectral interferences caused by high concentrations of Zr, Nb, Mo and Y in inductively coupled plasma mass spectrometry (ICP-MS) analysis for soil or sediment samples. In this study, the Zr, Nb, and Mo based oxide and/or hydroxide polyatomic interferences were successfully eliminated by ion-molecule reactions in a...

Mercury is subject to severe tungsten oxide (WO) interference in the direct ICP-MS analysis for soil or sediment samples. In this study, a method based on ion molecule reaction (IMR) was used to eliminate the WO spectral interference in a dynamic reaction cell (DRC). Interfered ion (202WO+) was drastically oxidized to higher oxide ions (218WO2+ or...