Results of the National Alachlor Well Water Survey

Article Abstract:

The National Alachlor Well Water Survey (NAWWS), designed to analyze drinking water, was conducted between mid-1987 and 1989. The presence of the herbicide alachlor in well water was studied. Samples of water were obtained from 1,430 private, rural wells in 89 counties. Fewer than 1% of the wells were found to have detectable amounts of alachlor. Tests for other pesticides revealed a 12% occurrence level for atrazine and a 50% occurrence level for nitrate/nitrite.

Drinking water, Contamination

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Immunoassay screens for alachlor in rural wells: false positives and an alachlor soil metabolite

Article Abstract:

The frequency of false positives in alachlor and the cross material that causes most of these responses are discussed. Water samples from the Water Quality Laboratory were tested by gas chromatography confirmation and measured of their final absorbance readings by a microplate reader. Confirmation tests were also made. It was found that the ethane-sulfonate metabolite in alachlor causes the appearnce of positive response among the false positive samples.

Methods, Analysis, Usage, Soil microbiology, Enzyme-linked immunosorbent assay, False positive reactions

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Occurrence of alachlor and its sulfonated metabolite in rivers and reservoirs of the midwestern United States: the importance of sulfonation in the transport of chloroacetanilide herbicides

Article Abstract:

The rate of formation and transport of alachlor and 2-((2',6'-diethylphenyl)-(methoxymethyl)amino)-2-oxoethanesulfonate (ESA) in rivers and vreservoirs in the Midwest was investigated using immunoassay, liquid chromatography and gas chromatography/mass spectrometry. The results showed that the median concentration of ESA was greater than that of alachlor, especially in the upper Midwestern states.

Environmental aspects, Midwestern States, Herbicides

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