Degradation of atrazine and isoproturon in surface and sub‐surface soil materials undergoing different moisture and aeration conditions

Issa, Salah F.; Wood, M.

doi:10.1002/ps.951

Cited by 35 publications

(21 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Atrazine degradation was the highest in the nonsterilized soils, with the exception of the Eudora soil from Ashland. The predicted half-life for atrazine in the non-sterilized soil are in agreement with literature values (Issa and Wood, 2005;Pang et al, 2005;Blume et al, 2004;Winkelmann and Klaine, 1991). The time for ground water (unamended) to reach the MCL for atrazine with an initial concentration on 20 mg L −1 was, in some cases, in excess of two years (Table IV).…”

Section: Kinetics Of Atrazine Degradationsupporting

confidence: 80%

Persistence of Atrazine and Alachlor in Ground Water Aquifers and Soil

Schwab

Splichal

Banks

2006

Water Air Soil Pollut

View full text Add to dashboard Cite

Degradation of atrazine and alachlor in saturated aquifer materials and soil was studied in the laboratory. A static aquifer was represented by a set of stagnant flasks and a well-mixed aquifer was simulated by recirculating columns. Water was tested at selected time intervals over six months and analyzed for herbicides and metabolites. Under all conditions, atrazine was more persistent than alachlor. Increased temperature had little effect on atrazine dissipation but did increase alachlor degradation rates, especially in the sterilized treatments. The addition of carbon and nitrogen prolonged the initial period before the onset of degradation in some of the columns. Enhanced mass transfer of the herbicides, nutrients, and oxygen in the recirculating columns dramatically increased dissipation of atrazine and alachlor. The degradation rates of atrazine and alachlor were 2 to 5 times faster in the recirculating columns than in the stagnant flasks. Atrazine was more persistent in the aquifer materials than in the soils, while alachlor dissipation was similar in the soils and recirculating aquifer columns, but was slower in the stagnant flasks. The prolonged persistence of atrazine under static, aquifer conditions (t 1/2 = 206 to 710 days) indicates that natural mechanisms are not sufficient to alleviate the risk of atrazine buildup over time; however, in a well mixed aquifer, atrazine degradation rates should be higher (t 1/2 = 66 to 106 days) and the threat of atrazine accumulation is diminished. Alachlor persistence at low concentrations (<10 μg L −1 ) in aquifers should not pose a long-term threat to ground water supplies.

show abstract

Section: Kinetics Of Atrazine Degradationsupporting

confidence: 80%

Persistence of Atrazine and Alachlor in Ground Water Aquifers and Soil

Schwab

Splichal

Banks

2006

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…Anaerobic biodegradation of atrazine has been shown to occur in soil, wetland, and wastewater samples. [8][9][10][11][12] However, in aquifers atrazine and metabolites can persist for decades or even longer. [13][14][15] The known biochemical steps of atrazine biodegradation are hydrolytic and do not require molecular O 2 .…”

Section: Introductionmentioning

confidence: 99%

Kinetics of aerobic and anaerobic biomineralization of atrazine in surface and subsurface agricultural soils in Ohio

Tuovinen

Deshmukh

Özkaya

et al. 2015

Journal of Environmental Science and Health, Part B

View full text Add to dashboard Cite

The purpose of this study was to assess atrazine mineralization in surface and subsurface samples retrieved from vertical cores of agricultural soils from two farm sites in Ohio. The Defiance site (NW-Ohio) was on soybean-corn rotation and Piketon (S-Ohio) was on continuous corn cultivation. Both sites had a history of atrazine application for at least a couple of decades. The clay fraction increased at the Defiance site and the organic matter and total N content decreased with depth at both sites. Mineralization of atrazine was assessed by measurement of (14)CO2 during incubation of soil samples with [U-ring-(14)C]-atrazine. Abiotic mineralization was negligible in all soil samples. Aerobic mineralization rate constants declined and the corresponding half-lives increased with depth at the Defiance site. Anaerobic mineralization (supplemented with nitrate) was mostly below the detection at the Defiance site. In Piketon samples, the kinetic parameters of aerobic and anaerobic biomineralization of atrazine displayed considerable scatter among replicate cores and duplicate biometers. In general, this study concludes that data especially for anaerobic biomineralization of atrazine can be more variable as compared to aerobic conditions and cannot be extrapolated from one agricultural site to another.

show abstract

“…The sensitivity of pesticide-degrading populations to less favorable conditions can be high because of the anticipated poor pesticide-degrading functional redundancy within a microbial community (11). Previous studies have reported the effect of a single environmental stress condition on pesticide-degrading microbial populations and their pesticide-degrading activity in soils and other ecosystems (12,13,17) but not in BPS, except for the effect of pesticide mixtures on pesticide degradation in biobed systems (9). Moreover, it is unknown whether or not such perturbations affect particular pesticide-degrading micropopulations added to BPS through bioaugmentation with pesticide-primed soil.…”

mentioning

confidence: 99%

Robust Linuron Degradation in On-Farm Biopurification Systems Exposed to Sequential Environmental Changes

Sniegowski

Bers

Ryckeboer

et al. 2011

Appl Environ Microbiol

View full text Add to dashboard Cite

On-farm biopurification systems (BPS) treat pesticide-contaminated wastewater of farms through biodegradation. Adding pesticide-primed soil has been shown to be beneficial for the establishment of pesticidedegrading populations in BPS. However, no data exist on the response of pesticide-degrading microbiota, either endogenous or introduced with pesticide-primed soil, when BPS are exposed to expected less favorable environmental conditions like cold periods, drought periods, and periods without a pesticide supply. Therefore, the response of microbiota mineralizing the herbicide linuron in BPS microcosm setups inoculated either with a linuron-primed soil or a nonprimed soil to a sequence of such less favorable conditions was examined. A period without linuron supply or a drought period reduced the size of the linuron-mineralizing community in both setups. The most severe effect was recorded for the setup containing nonprimed soil, in which stopping the linuron supply decreased the linuron degradation capacity to nondetectable levels. In both systems, linuron mineralization rapidly reestablished after conventional operation conditions were restored. A cold period and feeding with a pesticide mixture did not affect linuron mineralization. The changes in the linuron-mineralizing capacity in microcosms containing primed soil were associated with the dynamics of a particular Variovorax phylotype that previously had been associated with linuron mineralization. This study suggests that the pesticide-mineralizing community in BPS is robust in stress situations imposed by changes in environmental conditions expected to occur on farms. Moreover, it suggests that, in cases where effects do occur, recovery is rapid after restoring conventional operation conditions.The treatment of pesticide-contaminated wastewater in onfarm biopurification systems (BPS) is a low-cost and effortless solution for farmers to minimize the direct losses of pesticides to surface water (6). On-farm BPS operate as biofilters in which the pesticides are removed from the wastewater by biodegradation and sorption processes occurring in the biofilter matrix. The matrix in a BPS, designated a biomix, is composed of a mixture of soil, peat, and straw or other organic waste materials (6, 9). The addition of pesticide-primed soil to BPS has been proposed as an alternative for bioaugmentation with axenic cultures of specialized pesticide-degrading bacteria to accelerate pesticide degradation and avoid the production of toxic metabolites (7, 18). Sniegowski et al. (18) showed that bioaugmentation with a linuron-primed soil containing linuron-mineralizing microorganisms immediately resulted in the establishment of a linuron mineralization capacity in BPS microcosms. The size of the linuron-mineralizing populations in the system further increased when the microcosms were fed linuron. BPS microcosms inoculated with nonprimed soils also developed a linuron mineralization capacity but only after a much longer period of linuron supply. In the BPS microcosms contain...

show abstract

Degradation of atrazine and isoproturon in surface and sub‐surface soil materials undergoing different moisture and aeration conditions

Cited by 35 publications

References 24 publications

Persistence of Atrazine and Alachlor in Ground Water Aquifers and Soil

Persistence of Atrazine and Alachlor in Ground Water Aquifers and Soil

Kinetics of aerobic and anaerobic biomineralization of atrazine in surface and subsurface agricultural soils in Ohio

Robust Linuron Degradation in On-Farm Biopurification Systems Exposed to Sequential Environmental Changes

Contact Info

Product

Resources

About