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Aerobic versus Anaerobic Microbial Degradation of Clothianidin under Simulated California Rice Field Conditions.
Mulligan, Rebecca A; Tomco, Patrick L; Howard, Megan W; Schempp, Tabitha T; Stewart, Davis J; Stacey, Phillip M; Ball, David B; Tjeerdema, Ronald S.
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  • Mulligan RA; Department of Environmental Toxicology, College of Agricultural and Environmental Sciences, University of California , One Shields Avenue, Davis, California 95616-8588, United States.
  • Schempp TT; Department of Chemistry and Biochemistry, California State University , 400 West First Street, Chico, California 95929-0210, United States.
  • Ball DB; Department of Chemistry and Biochemistry, California State University , 400 West First Street, Chico, California 95929-0210, United States.
  • Tjeerdema RS; Department of Environmental Toxicology, College of Agricultural and Environmental Sciences, University of California , One Shields Avenue, Davis, California 95616-8588, United States.
J Agric Food Chem ; 64(38): 7059-67, 2016 Sep 28.
Article en En | MEDLINE | ID: mdl-27499061
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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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oryza / Microbiología del Suelo / Contaminantes del Suelo / Tiazoles / Guanidinas / Insecticidas País/Región como asunto: America do norte Idioma: En Revista: J Agric Food Chem Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oryza / Microbiología del Suelo / Contaminantes del Suelo / Tiazoles / Guanidinas / Insecticidas País/Región como asunto: America do norte Idioma: En Revista: J Agric Food Chem Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos