Recent studies of pesticides in streams and rivers of the central U.S. have focused on characterizing exposure patterns during a high pesticide use season.  In April-July 2013, a new direct aqueous injection LC/MSMS method was used to analyze more than 200 pesticide compounds in over 1500 filtered water samples from 100 stream sites throughout the central U.S. study area.  Weekly discrete water samples were analyzed for all 100 sites, and small-volume autosamplers were installed at a subset of 7 sites in agricultural and urban watersheds. The autosamplers collected daily and weekly composite samples. In addition, bed sediment samples were analyzed for over 100 pesticide compounds for all sites.  The results will provide a unique assessment of the exposure of aquatic life to pesticide mixtures and enable evaluation of the effects of different sampling strategies on exposure assessment.

Occurrence and characterization of pesticide mixtures in central U.S. streams and rivers

248th National Meeting (2014)

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