Partitioning of etofenprox under simulated California rice-growing conditions

Vasquez, Martice E.; Gunasekara, Amrith S.; Cahill, Thomas M.; Tjeerdema, Ronald S.

doi:10.1002/ps.1826

Cited by 9 publications

(8 citation statements)

References 13 publications

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“…This lack of dependency is consistent with the fact that clothianidin (p K a 11.0) is a neutral species within environmentally relevant pH ranges . The logK oc values for clothianidin on rice field soils are low compared with more hydrophobic rice pesticides like etofenprox ( S = 405 µg L −1 ), which has logK oc values ranging from 6.0 to 6.4 and 6.1 L kg −1 at 22 and 35 °C, respectively, for similar rice field soils …”

Section: Resultsmentioning

confidence: 97%

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Abiotic partitioning of clothianidin under simulated rice field conditions

2014

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Section: Resultsmentioning

confidence: 97%

“…9 The logK oc values for clothianidin on rice field soils are low compared with more hydrophobic rice pesticides like etofenprox (S = 405 μg L −1 ), which has logK oc values ranging from 6.0 to 6.4 and 6.1 L kg −1 at 22 and 35 ∘ C, respectively, for similar rice field soils. 27…”

Section: Soil-water Partitioningmentioning

confidence: 99%

Abiotic partitioning of clothianidin under simulated rice field conditions

2014

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“…Etofenprox (2‐(4‐ethoxyphenyl)‐2‐methylpropyl 3‐phenoxybenzylether, CAS No: 80 844‐07‐1), is a nonester synthetic pyrethroid, often used to control pests with a broad spectrum actiivity against crops such as rice, fruits, vegetables, corn, soya beans and tea (Jia et al, ). It can be applied at concentrations of 0.03–1.2 kg/ha for 14 days depending on country, plant, and the pest types (Sreehari et al, ; Vasquez et al, ). Similar to other pesticides, etofenprox can enter water bodies directly by pest control programs or indirectly through rain water and surface run off (USEPA, ; De Lorenzo and De Leon, ).…”

Section: Introductionmentioning

confidence: 99%

The influence of etofenprox on narrow clawed crayfish (Astacus leptodactylus Eschscholtz, 1823): Acute toxicity and sublethal effects on histology, hemolymph parameters, and total hemocyte counts

Benlı

2014

Environmental Toxicology

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The acute and sublethal effects of etofenprox, a nonester pyrethroid, was determined in narrow-clawed crayfish (Astacus leptodactylus Eschscholtz, 1823). Semistatic bioassay procedures were followed in both experiments, and the 24, 48, 72, and 96 h LC50 values (with 95% confidence limits) of technical etofenprox for crayfish were calculated as 0.68, 0.61, 0.45, and 0.41 µg/L, respectively based on Finney's probit analysis. Two concentrations of etofenprox (0.04 and 0.1 µg/L) were tested to determine sublethal effects due to 96 hours exposure. After exposure to sublethal etofenprox, hemolymph glucose, and lactate levels increased while total hemocyte counts and sodium levels decreased (p < 0.05). Hemolymph calcium, potassium, magnesium, and chloride concentrations did not change significantly. Histological alterations were evident in the gills and hepatopancreas after exposure to sublethal etofenprox concentrations. Lamellar hyperplasia and lining in the afferent and efferent branchial vessels were recorded in gills; whilst tubule necrosis was obvious in hepatopancreas. Etofenprox was found to be very highly toxic to crayfish, a nontarget organism. Exposure to sublethal concentrations for 96 h affected circulating hemocytes and hemolymph stress parameters via histological response, to compansate for the adverse effects of etofenprox. © 2014 Wiley Periodicals, Inc. Environ Toxicol 30: 887-894, 2015.

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“…The partitioning of etofenprox between air, water, and soil under representative California rice field conditions has been previously reported. 2 Etofenprox volatilization was shown to be an insignificant dissipation pathway from rice field water compared to soil sorption. The extreme insolubility of etofenprox, and pyrethroids in general, drives their high degree of sorption.…”

Section: ' Introductionmentioning

confidence: 96%

Aerobic versus Anaerobic Microbial Degradation of Etofenprox in a California Rice Field Soil

Vasquez

Holstege

Tjeerdema

2011

J. Agric. Food Chem.

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The microbial degradation of etofenprox, an ether pyrethroid, was characterized under anaerobic (flooded) and aerobic (nonflooded) California rice field soil conditions by determination of its half-life (t1/2) and dissipation rate constant (k) and identification and quantification of degradation products at both 22 and 40 °C using LC-MS/MS. The overall anaerobic t1/2 at 22 °C ranged from 49.1 to 100 days (k=-0.0141 to -0.0069 days(-1)) compared to 27.0 days (k=-0.0257 days(-1)) at 40 °C, whereas under aerobic conditions the overall t1/2 was 27.5 days (k=-0.0252 days(-1)) at 22 °C compared to 10.1-26.5 days (k=-0.0686 to -0.0262 days(-1)) at 40 °C. The biphasic dissipation profiles were also fit to a first-order model to determine the t1/2 and k for both the fast and slow kinetic regions of the dissipation curves. Hydroxylation at the 4'-position of the phenoxy phenyl ring was the major metabolic process under anaerobic conditions for both 22 °C (maximum% yield of applied etofenprox mass=1.3±0.7%) and 40 °C (max % yield=1.2±0.8%). Oxidation of the ether moiety to the ester was the major metabolite under aerobic conditions at 22 °C (max% yield=0.5±0.1%), but at 40 °C increased amounts of the hydroxylated form were produced (max% yield=0.7±0.2%, compared to 0.3±0.1% for the ester). The hydrolytic product of the ester, 3-phenoxybenzoic acid (3-PBA), was not detected in any samples. Sterilized control soils showed little etofenprox degradation over the 56-day incubation period. Thus, the microbial population in a flooded soil was able to transform and contribute to the overall dissipation of etofenprox. The simulated summer temperature extreme (40 °C) increased the overall degradation.

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Partitioning of etofenprox under simulated California rice-growing conditions

Cited by 9 publications

References 13 publications

Abiotic partitioning of clothianidin under simulated rice field conditions

Abiotic partitioning of clothianidin under simulated rice field conditions

The influence of etofenprox on narrow clawed crayfish (Astacus leptodactylus Eschscholtz, 1823): Acute toxicity and sublethal effects on histology, hemolymph parameters, and total hemocyte counts

Aerobic versus Anaerobic Microbial Degradation of Etofenprox in a California Rice Field Soil

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