Photodegradation of clothianidin under simulated California rice field conditions

Mulligan, Rebecca A; Redman, Zachary C.; Keener, Megan; Ball, David B.; Tjeerdema, Ronald S.

doi:10.1002/ps.4150

Cited by 13 publications

(8 citation statements)

References 23 publications

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“…Fig 5C illustrates the possible photo-degradation pathway of clothianidin (C 6 H 8 N 3 OSCl as photo-degradation product), similar to that observed for imidacloprid, and different from results reported by Mulligan et al [60].…”

Section: Resultsmentioning

confidence: 47%

Photo-degradation dynamics of five neonicotinoids: Bamboo vinegar as a synergistic agent for improved functional duration

et al. 2019

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The effects of photo-degradation on the utilization of pesticides in agricultural production has been investigated. Various influencing factors were compared, with results showing that the initial pesticide concentration, light source, water quality and pH possessed different effects on neonicotinoids photo-degradation. The initial concentration and pH were found to be most critical effects. The photo-degradation rate decreased by a factor of 2–4 when the initial concentration increased from 5 mg L-1 to 20 mg L-1, particularly for acetamiprid and imidacloprid. The photo-degradation pathways and products of the five neonicotinoids were also investigated, with similar pathways found for each pesticide, except for acetamiprid. Degradation pathways mainly involved photo-oxidation processes, with products identified using liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-Q-TOF-MS) found to be consistent with literature reported results. Bamboo vinegar exerted a photo-quenching effect on the neonicotinoids, with an improved efficiency at higher vinegar concentrations. The photo-quenching rates of thiamethoxam and dinotefuran were 381.58% and 310.62%, respectively, when a 30-fold dilution of vinegar was employed. The photo-degradation products in bamboo vinegar were identical to those observed in methanol, with acetic acid being the main factor influencing the observed quenching effects.

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Section: Resultsmentioning

confidence: 47%

Photo-degradation dynamics of five neonicotinoids: Bamboo vinegar as a synergistic agent for improved functional duration

et al. 2019

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“…Formic acid (puriss p.a., ∼98%), deionized water (≤4.3 μS cm −1 ), methanol, acetone, and water were purchased from Sigma-Aldrich. Synthesis of the degradation product N-(2-chloro-1,3-thiazol-5-ylmethyl)-N-methylurea (TZMU; ≥95.0% purity) was described in Mulligan et al 24 Synthesis of N-(2-Chlorothiazol-5-ylmethyl)-N′-nitroguanidine (TZNG). A homogeneous solution of 2-chlorothiazol-5-yl methanaminium chloride (1.92 g, 10.4 mmol), 100 mL of ethanol, and diisopropylethylamine (3.61 mL, 20.7 mmol) was prepared in a round-bottom flask equipped with a stir bar.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Formic acid (puriss p.a., ∼98%), deionized water (≤4.3 μS cm –1 ), methanol, acetone, and water were purchased from Sigma-Aldrich. Synthesis of the degradation product N -(2-chloro-1,3-thiazol-5-ylmethyl)- N -methylurea (TZMU; ≥95.0% purity) was described in Mulligan et al…”

Section: Methodsmentioning

confidence: 99%

Aerobic versus Anaerobic Microbial Degradation of Clothianidin under Simulated California Rice Field Conditions

Mulligan

Tomco

Howard

et al. 2016

J. Agric. Food Chem.

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Microbial degradation of clothianidin was characterized under aerobic and anaerobic California rice field conditions. Rate constants (k) and half-lives (DT50) were determined for aerobic and anaerobic microcosms, and an enrichment experiment was performed at various nutrient conditions and pesticide concentrations. Temperature effects on anaerobic degradation rates were determined at 22 ± 2 and 35 ± 2 °C. Microbial growth was assessed in the presence of various pesticide concentrations, and distinct colonies were isolated and identified. Slow aerobic degradation was observed, but anaerobic degradation occurred rapidly at both 25 and 35 °C. Transformation rates and DT50 values in flooded soil at 35 ± 2 °C (k = -7.16 × 10(-2) ± 3.08 × 10(-3) day(-1), DT50 = 9.7 days) were significantly faster than in 25 ± 2 °C microcosms (k= -2.45 × 10(-2) ± 1.59 × 10(-3) day(-1), DT50 = 28.3 days). At the field scale, biodegradation of clothianidin will vary with extent of oxygenation.

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“…In 2014, rapid dissipations of clothianidin, similar to those of fipronil, were observed. Although the photodegradation half-lives of clothianidin (14.7-19.4 days) were lower than those of fipronil, 23) the concentrations of clothianidin rapidly decreased because it is highly degradable under flooded conditions and due to microbial activity. 24) In addition, the slower decrease phase was observed only in the volcanic ash soil plots.…”

Section: Dissipation Characteristics Of Nursey-box-applied Pesticidesmentioning

confidence: 90%

Performance evaluation of lysimeter experiments for simulating pesticide dissipation in paddy fields. Part 2: Nursery-box application and foliar application

et al. 2019

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Comparative experiments investigating the dissipation of four nursery-box-applied pesticides and three foliar-applied pesticides were conducted using lysimeters and in actual paddy fields. In the lysimeter experiments, there were test plots for submerged application for both application types. Analytical concentrations of the pesticides in paddy water were evaluated using appropriate kinetic models. The detection levels of pesticides in the paddy water for the nursery-box and foliar applications were 10-77% and 42-79% of the submerged application, respectively. The times required for 50% dissipation (DT 50 s) in case of the nursery-box and foliar applications were 0.8-10.4 days and 0.5-2.7 days, respectively. Although overall dissipations were affected by the physicochemical properties of the pesticide and the experimental design in the test plots, the initial detection levels in the lysimeters, governed by the runoff at transplanting and the deposition at spraying, were comparable with those in the actual paddy fields.

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Photodegradation of clothianidin under simulated California rice field conditions

Cited by 13 publications

References 23 publications

Photo-degradation dynamics of five neonicotinoids: Bamboo vinegar as a synergistic agent for improved functional duration

Photo-degradation dynamics of five neonicotinoids: Bamboo vinegar as a synergistic agent for improved functional duration

Aerobic versus Anaerobic Microbial Degradation of Clothianidin under Simulated California Rice Field Conditions

Performance evaluation of lysimeter experiments for simulating pesticide dissipation in paddy fields. Part 2: Nursery-box application and foliar application

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