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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Field Dissipation Studies: The Measurement of Zero-Time Residues
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Field Dissipation Studies: The Measurement of Zero-Time Residues

机译：场耗研究：零时间残留物的测量

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Low zero-time recoveries in field soil dissipation studies of pesticides were identified as a problem by the United States Environmental Protection Agency (EPA) in 1992. Studies were designed to include various capture systems in addition to collection of standard soil cores in order to determine whether low recoveries were the result of misapplication or were from some other cause. Data from a range of capture systems for a variety of chemicals and formulation types verified that the chemical was reaching the soil. This suggested that low residues from zero-time cores were the result of sampling problems rather than application issues. Other possible contributors to low recoveries were losses after application, un-representative sampling, and losses during sample handling and preparation. Several of these processes can combine to produce low zero-time recoveries. The analysis of multiple data sets showed that low zero-time values resulted in a conservative prediction of half-life. The increase in half-life is relatively small, generally about 15%, with some up to 30%.
机译：1992年，美国环境保护署（EPA）将农药在田间土壤耗散研究中的零时回收率低视为一个问题。除确定标准土壤核心外，还设计了包括各种捕集系统的研究，以便确定低回收率是由于使用不当还是其他原因造成的。来自各种化学物质和配方类型的一系列捕获系统的数据验证了该化学物质已到达土壤。这表明零时磁芯的残留量低是采样问题而不是应用问题的结果。回收率低的其他可能原因是应用后的损失，无代表性的采样以及样品处理和制备期间的损失。这些过程中的几个可以结合起来以产生低的零时回收率。对多个数据集的分析表明，零时间值低会导致半衰期的保守预测。半衰期的增加相对较小，通常约为15％，有些则高达30％。

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