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This paper describes the characterization of atrazine using an approach developed by the US Geological Survey for an artificial recharge demonstration project in south-central Kansas. Stream discharge and atrazine concentrations, loads, and yields were examined at two US Geological Survey gauging stations from January 1995 through December 1997. A stage-discharge relationship was developed on the basis of discharge measurements and the stage of the stream at the time of measurement. Results of samples collected by automated samplers were compared to results from samples collected manually using depth- and width-integrating techniques. About 1,800 samples were analyzed for triazine herbicides using enzyme-linked immunosorbent assay (ELISA), with a turnaround time of about 2 days per sample. To determine specific atrazine concentrations, 191 samples were also analyzed by gas chromatography/mass spectrometry. Results showed that annual mean atrazine concentrations did not exceed the MCL for atrazine for any year from 1995 through 1997 at either sampling site. However, daily mean atrazine concentrations in water samples from the sampling sites were as high as 33.5 ug/L during spring and summer runoff. Concentrations larger than 3.0 ug/L did not occur at other times of the year.

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Published: 01/01/1998 ISBN(s): 0898679796 Number of Pages: 9File Size: 1 file , 8.5 MB