Enhanced biodegradation of atrazine at high infiltration rates in agricultural soils

Barrios, Renys Enrique; Gaonkar, Omkar; Snow, Daniel D.; Li, Yusong; Li, Xu; Bartelt–Hunt, Shannon L.

doi:10.1039/c8em00594j

Cited by 13 publications

(9 citation statements)

References 59 publications

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“…Total atrazine flux out from the bottom of the profile was about 6 mg/m 2 higher under the past climate condition than the future climate condition, which showed that atrazine leaching rate decreased in the future climatic condition. Similarly, previous studies have reported that the interaction between changes in precipitation (i.e., higher infiltration rates) and temperature (i.e., enhanced degradation) due to climate change conditions resulted in a decrease in pesticide concentrations in the leachate (Barrios et al, 2019;Steffens et al, 2015).…”

Section: Atrazinesupporting

confidence: 58%

“…For example, the biodegradation products of atrazine, DEA and DIA, were formed in a soil column with ~40% soil moisture content, but not in a soil column with ~70% soil moisture content due to decreased residence time (Sonon and Schwab, 2004). On the contrary, atrazine half-life increased from 8 d to 16 d when the soil moisture decreased from 25% to 5%, respectively (Barrios et al, 2019). In a future climate scenario, drier soils may affect biodegradation of pesticides by increasing residence time, limiting microbial activities, and chemical availability.…”

Section: Water Flux and Soil Moisture Contentmentioning

confidence: 97%

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Climate change impacts the subsurface transport of atrazine and estrone originating from agricultural production activities

Barrios

Akbariyeh

Liu

et al. 2020

Environmental Pollution

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Climate change will impact soil properties such as soil moisture, organic carbon and temperature and changes in these properties will influence the sorption, biodegradation and leaching of trace organic contaminants to groundwater. In this study, we conducted a modeling case study to evaluate atrazine and estrone transport in the subsurface under current and future climate conditions at a field site in central Nebraska. According to the modeling results, in the future, enhanced evapotranspiration and increased average air temperature may cause drier soil conditions, which consequently reduces the biodegradation of atrazine and estrone in the water phase. On the other hand, greater transpiration rates lead to greater root solute uptake which may decrease the concentration of atrazine and estrone in the soil profile. Another consequence of future climate is that the infiltration and leaching rates for both atrazine and estrone may be lower under future climate scenarios. Reduced infiltration of trace organic compounds may indicate that lower trace organic concentrations in groundwater may occur under future climate scenarios.

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Section: Atrazinesupporting

confidence: 58%

Section: Water Flux and Soil Moisture Contentmentioning

confidence: 97%

Climate change impacts the subsurface transport of atrazine and estrone originating from agricultural production activities

Barrios

Akbariyeh

Liu

et al. 2020

Environmental Pollution

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“…Predictive models are also employed to carry out assessments on future scenarios such as climate change, land-use change, and global environmental change (e.g., Hiscock et al, 2007;Armitage et al, 2011;Brack et al, 2015). Processes and environmental factors controlling contaminant dynamics (e.g., soilwater dynamics, contaminant sorption to soil minerals and organic matter, biochemical degradation, microbial-nutrient interactions, and soil-plant interactions) are described and coupled in models through mathematical equations with parameters often sourced from literature or estimated against laboratory or field experiments (Jackson et al, 2000;Barrios et al, 2019). Since environmental systems are complex and open to energy and mass flows, it is difficult to constrain and model all controlling processes (Oreskes et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Probabilistic indicators for soil and groundwater contamination risk assessment

Cecilia

Porta

Tang

et al. 2020

Ecological Indicators

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Deterministic assessments of whether, when, and where environmental safety thresholds are exceeded by pollutants are often unreliable due to uncertainty stemming from incomplete knowledge of the properties of environmental systems and limited sampling. We present a global sensitivity analysis to rank the contribution of uncertain parameters to the probability, P, of a target quantity to exceed user-defined environmental safety thresholds. To this end, we propose a new index (AMAP) which quantifies the impact of a parameter on P and can be readily employed in probabilistic risk assessment. We apply AMAP, along with existing moment-based sensitivity indices, to quantify

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“…Atrazine [6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine] is a widely used herbicide in controlling weed growth. Once atrazine is applied in the surface soil, it is decomposed within a few months [1][2][3]. However, much less is known about what occurs to atrazine as it passes through the soil layers, e.g., during intense rainfall [1,4].…”

Section: Introductionmentioning

confidence: 99%

“…Once atrazine is applied in the surface soil, it is decomposed within a few months [1][2][3]. However, much less is known about what occurs to atrazine as it passes through the soil layers, e.g., during intense rainfall [1,4]. Atrazine dissipation is often slow in the groundwater environment, and half-lives typically range from hundreds of days to no degradation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Improved Short-Term Microbial Degradation in Circulating Water Reducing High Stagnant Atrazine Concentrations in Subsurface Sediments

Liu

Hui

Kontro

2020

Water

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The triazine herbicide atrazine easily leaches with water through soil layers into groundwater, where it is persistent. Its behavior during short-term transport is poorly understood, and there is no in situ remediation method for it. The aim of this study was to investigate whether water circulation, or circulation combined with bioaugmentation (Pseudomonas sp. ADP, or four isolates from atrazine-contaminated sediments) alone or with biostimulation (Na-citrate), could enhance atrazine dissipation in subsurface sediment–water systems. Atrazine concentrations (100 mg L−1) in the liquid phase of sediment slurries and in the circulating water of sediment columns were followed for 10 days. Atrazine was rapidly degraded to 53–64 mg L−1 in the slurries, and further to 10–18 mg L−1 in the circulating water, by the inherent microbes of sediments collected from 13.6 m in an atrazine-contaminated aquifer. Bioaugmentation without or with biostimulation had minor effects on atrazine degradation. The microbial number simultaneously increased in the slurries from 1.0 × 103 to 0.8–1.0 × 108 cfu mL−1, and in the circulating water from 0.1–1.0 × 102 to 0.24–8.8 × 104 cfu mL−1. In sediments without added atrazine, the cultivable microbial numbers remained low at 0.82–8.0 × 104 cfu mL−1 in the slurries, and at 0.1–2.8 × 103 cfu mL−1 in the circulating water. The cultivated microorganisms belonged to the nine genera Acinetobacter, Burkholderia, Methylobacterium, Pseudomonas, Rhodococcus, Sphingomonas, Streptomyces, Variovorax and Williamsia; i.e., biodiversity was low. Water flow through the sediments released adsorbed and complex-bound atrazine for microbial degradation, though the residual concentration of 10–64 mg L−1 was high and could contaminate large groundwater volumes from a point source, e.g., during heavy rain or flooding.

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Enhanced biodegradation of atrazine at high infiltration rates in agricultural soils

Abstract: Competing effects of increasing infiltration and enhanced degradation due to historical atrazine application in soils may limit the impact on atrazine transport under scenarios representative of climate change.

Cited by 13 publications

References 59 publications

Climate change impacts the subsurface transport of atrazine and estrone originating from agricultural production activities

Climate change impacts the subsurface transport of atrazine and estrone originating from agricultural production activities

Probabilistic indicators for soil and groundwater contamination risk assessment

Improved Short-Term Microbial Degradation in Circulating Water Reducing High Stagnant Atrazine Concentrations in Subsurface Sediments

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