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首页> 美国政府科技报告 >Ground-Water Quality and Vulnerability to Contamination in Selected Agricultural Areas of Southeastern Michigan, Northwestern Ohio, and Northeastern Indiana.
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Ground-Water Quality and Vulnerability to Contamination in Selected Agricultural Areas of Southeastern Michigan, Northwestern Ohio, and Northeastern Indiana.

机译：密歇根州东南部，俄亥俄州西北部和印第安纳州东北部选定农业区的地下水质量和易受污染。

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Ground-water quality was assessed in the northeastern part of the Corn Belt, where tile-drained row crops are underlain by fractured glacial till. Data were collected from 30 shallow monitor wells and 18 co-located domestic wells as part of the U.S. Geological Survey's National Water-Quality Assessment in the Lake Erie-Lake St. Clair Basin. Pesticides or pesticide degradates were detected in 41 percent of the monitor wells and 6 percent of the domestic wells. The pesticides detected closely correspond to those most heavily applied-herbicides used on corn and soybeans. Pesticide degradates were detected three times more frequently, and at higher concentrations, than were parent compounds. No pesticides concentration exceeded a USEPA Maximum Contaminant Level (MCL), but MCL's have not been established for 9 of the 11 compounds detected.

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