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首页> 外文期刊>Environmental Science & Technology >Acetochlor in the Hydrologic System in the Midwestern United States, 1994
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Acetochlor in the Hydrologic System in the Midwestern United States, 1994

机译：1994年美国中西部水文系统中的乙草胺

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摘要

The herbicide acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide] was given conditional registration in the United States by the U.S. Environmental Protection Agency in March 1994. This registration provided a rare opportunity to investigate the occurrence of a pesticide during its first season of extensive use in the midwestern United States. Water samples collected and analyzed bythe U.S. Geological Survey during 1994 documented the distribution of acetochlor in the hydrologic system; it was detected in 29% of the rain samples from four sites in Iowa, 17% of the stream samples from 51 sites across nine states, and 0% of the groundwater samples from 38 wells across eight states. Acetochlor exhibited concentration increases in rain and streams following its application to corn in the midwestern United States, with 75% of the rainwater and 35% of the stream samples having acetochlor detected during this time period. Acetochlor concentrations in rain decreased as the growing season progressed. Based onthe limited data collected for this study, it is anticipated that acetochlor concentrations will have a seasonal pattern in rain and streams similar to those of other acetanilide herbicides examined. Possible explanations for the absence of acetochlor in groundwater forthis study include the rapid degradation of acetochlor in the soil zone, insufficient time for this first extensive use of acetochlor to have reached the aquifers sampled, and the possible lack of acetochlor use in the recharge areas for the wells examined.
机译：1994年3月，美国环境保护署在美国对除草剂乙草胺[2-氯-N-（乙氧基甲基）-N-（2-乙基-6-甲基苯基）乙酰胺]进行了有条件注册。这种注册非常少见有机会调查在美国中西部广泛使用农药的第一个季节中农药的发生情况。 1994年美国地质调查局收集和分析的水样记录了乙草胺在水文系统中的分布。在爱荷华州四个地点的29％雨水样本，九个州51个地点的17％溪流样本，八个州38个井的地下水样本中0％被检出。在美国中西部玉米中施用乙草胺后，其在雨水和溪流中的浓度增加，其中有75％的雨水和35％的溪流样品在这段时间内检测到了乙草胺。随着生长期的发展，雨中乙草胺的浓度下降。根据为这项研究收集的有限数据，预计在雨水和溪流中乙草胺的浓度将具有季节性模式，与所检查的其他对乙酰苯胺除草剂的浓度相似。这项研究中地下水中无乙草胺的可能解释包括土壤区域乙草胺的快速降解，首次大量使用乙草胺的时间不足以达到采样的含水层，以及在补给区可能没有乙草胺的使用。检查的井。

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