Analysis of multiple pesticides in urban storm water using solid-phase extraction

An analytical method was developed using C-18 solid-phase extraction and ga s chromatography-nitrogen phosphorus detection (GC-NPD) to determine the pr esence and quantity of 12 contemporary pesticides in storm water runoff fro m an urban environment. The method was validated, using deionized water and water collected from a local pond, for two concentration levels and four h olding time regimes. The method was then utilized in a study examining nonp oint source (NPS) pollution in Wichita, KS. Accuracy and precision were dem onstrated in each test for each analyte except diazinon, which degraded rap idly during holding times in aqueous solution. For all matrices, concentrat ion levels, and holding times, mean recoveries for the remaining 11 pestici des ranged from 50% to 105% with percent relative standard deviations less than 25%.