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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Field Soil Dissipation ~(14)CET―751 (Pyraflufen-ethyl) in Bare Ground in California High Specific Activity Radiolabeled Test Substance and Small Plot Design Afford Excellent Method To Measure Field Dissipation
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Field Soil Dissipation ~(14)CET―751 (Pyraflufen-ethyl) in Bare Ground in California High Specific Activity Radiolabeled Test Substance and Small Plot Design Afford Excellent Method To Measure Field Dissipation

机译：加利福尼亚裸地中的田间土壤耗散〜（14）C ET―751（吡氟苯醚-乙基）高比活度放射性标记的测试物质和小面积设计，是一种测量田间耗散的出色方法

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Field soil dissipation studies to support EPA registration of pyraflufen-ethyl (ET-751) were conducted in small outdoor plots (3 x 20 feet) under cotton growing conditions in California using [pyrazole-5-~(14)C] labeled test substance applied at 13.4 g/acre (33.2 g/ha). Use of radiolabeled ET-751 afforded a limit of quantification (LOQ) of < 0.001 parts per million (ppm) for soil total radioactive residues (TRR) determinations and extracted metabolite residues. The t_(1/2) for ET-751 was < 1 day due to rapid hydrolysis to the free acid (E-1). The latter reached its maximum (0.0193 ppm) in 0-3 inch soil segments after 6 hours, but this was short lived (t_(1/2)～14 days) and residues fell to < 0.010 ppm by 14 DAT. Other identified metabolites were formed from E-1 or ET-751 by reductive cleavage, O-methylation and/or N-demethylation reactions. Each of the latter metabolites was detected at 0.010 ppm in 0-3 inch soil extracts. At least two unidentified polar metabolites (designated U-1 and U-2) were also detected. U-2 contained at least two components, which had chromatographic properties similar to unknown polar metabolites detected in parallel soil photolysis or aerobic soil studies. None of the 3-6 inch soil segments contained TRR > 0.010 ppm. TRR in lower soil segments were 0.010 ppm. A maximum of 0.0025 ppm E-1 was detected in 3-6 inch soil extracts (14 DAT) and U-2 reached 0.0038 ppm in 28 DAT 3-6 inch soil. By 359 DAT all metabolite residues were 0.001 ppm, or less, in 0-3 inch and 3-6 inch soil extracts. The degradation of parent and formation of known metabolites in the dissipation study and a parallel aerobic soil metabolism study was similar both qualitatively and quantitatively.
机译：在加利福尼亚州的棉花种植条件下，使用[吡唑-5-〜（14）C]标记的测试物质，在室外小面积（3 x 20英尺）内，进行田间土壤耗散研究，以支持吡氟氟醚（EPA-751）的EPA注册施用量为13.4克/英亩（33.2克/公顷）。使用放射性标记的ET-751对土壤总放射性残留物（TRR）测定和提取的代谢物残留物的定量限（LOQ）<百万分之0.001（ppm）。由于快速水解为游离酸（E-1），ET-751的t_（1/2）<1天。在6小时后，后者在0-3英寸土壤段达到了最大值（0.0193 ppm），但这是短命的（t_（1/2）〜14天），残留物在14 DAT时降至<0.010 ppm。通过还原裂解，O-甲基化和/或N-去甲基化反应，从E-1或ET-751形成了其他鉴定出的代谢物。在0-3英寸的土壤提取物中，每种后一种代谢产物的含量均<<< 0.010 ppm。还检测到至少两种未鉴定的极性代谢物（称为U-1和U-2）。 U-2包含至少两种成分，其色谱性质类似于在平行土壤光解或好氧土壤研究中检测到的未知极性代谢物。 3-6英寸的土壤段均未包含TRR> 0.010 ppm。较低土壤段的TRR≤0.010 ppm。在3-6英寸土壤提取物中（14 DAT）检测到最大0.0025 ppm E-1，在28 DAT 3-6英寸土壤中U-2达到0.0038 ppm。到359 DAT为止，0-3英寸和3-6英寸土壤提取物中的所有代谢物残留量均为0.001 ppm或更低。耗散研究和有氧土壤代谢平行研究中母体的降解和已知代谢物的形成在定性和定量上相似。

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