Gerrad Jones

Oregon State University | OSU · Department of Biological and Ecological Engineering

A major source of toxic per- and polyfluoroalkyl substances (PFAS) is aqueous film-forming foams (AFFF) used in firefighting and training at airports and military installations, however, PFAS have many additional sources in consumer products and industrial processes. A field study was conducted on fish tissues from three reaches of the Columbia Slo...

This study elucidates per- and polyfluoroalkyl substance (PFAS) fingerprints for specific PFAS source types. Ninety-two samples were collected from aqueous film-forming foam impacted groundwater (AFFF-GW), landfill leachate, biosolids leachate, municipal wastewater treatment plant effluent (WWTP), and wastewater effluent from the pulp and paper and...

We investigated environmental, landscape, and microbial factors that could structure the spatiotemporal variability in the nontarget chemical composition of four riverine systems in the Oregon Coast Range, USA. We hypothesized that the nontarget chemical composition in river water would be structured by broad-scale landscape gradients in each water...

The source tracking of per- and polyfluoroalkyl substances (PFASs) is a new and increasingly necessary subfield within environmental forensics. We define PFAS source tracking as the accurate characterization and differentiation of multiple sources contributing to PFAS contamination in the environment. PFAS source tracking should employ analytical m...

Maintaining the quality and quantity of water resources in light of complex changes in climate, human land use, and ecosystem composition requires detailed understanding of ecohydrologic function within catchments, yet monitoring relevant upstream characteristics can be challenging. In this study, we investigate how variability in riverine microbia...

Selenium (Se) is an essential trace element for maintaining homeostasis in humans and is characterized by a narrow range of recommended dietary intake levels. The main dietary sources of Se are food crops and therefore human intake levels largely depend on total concentrations and forms of Se in those food products. Important factors controlling Se...

While the impact of arsenic in irrigated agriculture has become a major environmental concern in Bangladesh, to date there is still a limited understanding of arsenic in Bangladeshi paddy soils at a landscape level. A soil survey was conducted across ten different physiographic regions of Bangladesh, which encompassed six types of geomorphology (Bi...

Significance The trace element selenium is essential for human health and is required in a narrow dietary concentration range. Insufficient selenium intake has been estimated to affect up to 1 billion people worldwide. Dietary selenium availability is controlled by soil–plant interactions, but the mechanisms governing its broad-scale soil distribut...

Atmospheric processes play an important role in the supply of the trace element selenium (Se) as well as other essential trace elements to terrestrial environments, mainly via wet deposition. Here we investigate whether the marine biosphere can be identified as a source of Se and of other trace elements in precipitation samples. We used artificial...

Selenium (Se) is an essential element for humans and animals, which occurs ubiquitously in the environment. It is present in trace amounts in both organic and inorganic forms in marine and freshwater systems, soils, biomass and in the atmosphere. Low Se levels in certain terrestrial environments have resulted in Se deficiency in humans, while eleva...

To assess the relative ecological risks of trenbolone acetate (TBA) use in agro-ecosystems, we evaluated the spatio-temporal dynamics of TBA metabolite transport during irrigation and rainfall events. Within a pasture, TBA-implanted heifers (40 mg TBA, 8 mg estradiol) were briefly penned (24 hr) at high stocking densities (500 animal units (AU)/ha)...

Although studies have evaluated the ecotoxicity and fate of trenbolone acetate (TBA) metabolites, namely 17α-trenbolone (17α-TBOH), 17β-trenbolone (17β-TBOH), and trendione (TBO), their environmental transport processes remain poorly characterized with little information available to guide agricultural runoff management. Therefore, we evaluated TBA...

Several studies have documented the occurrence and fate of trenbolone acetate (TBA) metabolites in soil and water. However, considerable uncertainty still exists with respect to TBA risk in agro-ecosystems because limited data are available to quantify excretion, transformation, and leaching processes. To address these uncertainties, we used experi...

Water quality treatment via constructed storm-water wetlands (CSWs) is intimately linked to system hydraulics. Previous works have attempted to define the relationship between performance and wetland design variables (e.g.,length, width, area). However, these works suffer from two major flaws: small sample size and/or nonrandom samples. The authors...

Return of the Steroid Trace levels of organic contaminants enter aquatic ecosystems from a variety of sources, including runoff of from agricultural lands. When these compounds and their metabolites break down, it is generally assumed that they become inert and pose less ecological risk. Qu et al. (p. 347 , published online 26 September) tracked th...

Padre Island is the largest barrier island in the world, extending 182 km from Corpus Christi to Port Isabel along the Texas coast. Although parts of Padre Island are developed, Padre Island National Seashore (PAIS) is the largest stretch of undeveloped barrier island in the world and is dominated by coastal prairie. The coastal prairie ecosystem i...

Despite the widespread use of the anabolic androgen trenbolone acetate (TBA) in animal agriculture, evidence demonstrating the occurrence of TBA metabolites such as 17β-trenbolone (17β-TBOH), 17α-trenbolone (17α-TBOH), and trendione (TBO) is relatively scarce, potentially due to rapid transformation processes such as direct photolysis. Therefore, w...

Constructed wetlands are becoming increasingly popular in managing stormwater and other wastewaters. Studies examining the relationship between performance and design parameters suffer from two flaws: 1) small sample size and 2) non-random samples. These constraints limit the applicability of existing performance predicting equations. Therefore, th...

Traditionally, detention basins and constructed stormwater wetlands (CSW) have been used primarily for peak flow reduction and water quality improvement and are assumed to possess negligible infiltrative capabilities. However, the potential for storm water infiltration within these structures and the associated non-point source pollution of groundw...

A thorough understanding of the hydrology of a constructed stormwater wetland (CSW) is essential to develop a water budget; that is a comprehensive view of all inputs and outputs in the system. Two of the principal functions of a CSW are to 1) reduce peak flows and 2) improve water quality. The latter is achieved through biological, chemical, and p...