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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Sources and Magnitudes of Variability in the Terrestrial Field Dissipation of Pesticides
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Sources and Magnitudes of Variability in the Terrestrial Field Dissipation of Pesticides

机译：陆上农药消散的变化来源和幅度

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摘要

Excessive within-site variability in terrestrial field dissipation rate data can prevent the accurate determination of a pesticide's rate of dissipation. The primary sources of variability in these studies include errors associated with test substance application (s~2_(Application)), soil sampling (s~2_(Sampling)), sample analysis (s~2_(Analysis)) and variability among factors affecting abiotic and biotic dissipation processes in soil (s~2_(Dissipation)). The physicochemical properties of a pesticide also affect the observed variability in dissipation rate. Of these potential sources of error, s~2_(Application) and s~2_(Analysis) are the best characterized, each yielding CV values of 10 to 15% for well-controlled bare-soil studies. Variability induced during soil sample homogenization may represent a significant portion of s~2_(Analysis). The magnitudes of s~2_(Sampling) and s~2_(Dissipation) are not well-characterized; both may represent significant sources of variability under field conditions. In practice, it may be difficult to differentiate s~2_(Sampling) from s~2_(Dissipation) due to confounding, but one possible approach is offered here.
机译：地面场耗散率数据的场内差异太大会妨碍准确确定农药的耗散率。这些研究中变异性的主要来源包括与测试物质施用（s〜2_（Application）），土壤采样（s〜2_（Sampling）），样本分析（s〜2_（Analysis））相关的误差以及影响因素的变异性土壤中的非生物和生物耗散过程（s〜2_（耗散））。农药的物理化学性质也会影响耗散率的变化。在这些潜在的误差源中，s〜2_（应用程序）和s〜2_（分析）的特征最为突出，对于控制良好的裸土研究，每个CV值均占10％至15％。土壤样品均质化过程中引起的变异性可能代表s〜2_（分析）的很大一部分。 s〜2_（采样）和s〜2_（耗散）的大小没有很好的表征；两者都可能代表现场条件下的大量可变性来源。实际上，由于混淆，可能很难将s〜2_（采样）与s〜2_（耗散）区分开，但是这里提供了一种可能的方法。

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