Abstract
The semipermeable membrane device (SPMD) technology, was used to determine the presence of bioavailable organochlorine (OC) pesticides in the water of the main stem Missouri River. SPMDs were deployed for 28 days at five main stem sites - Sioux City, IA; Nebraska City,NE; Kansas City, MO; Glasgow, MO; and Hermann, MO. In general, OCs were present at all sites. Of all targeted analytes, the chlordane components, heptachlor expoxide, toaxaphene, and dieldrin were generally present at the highest concentrations. Replicate (n = 4) SPMD samplers sequestered similar quantities (typical CV = 10-35% ) of each OC pesticide. The sequestered residues represent an estimation of bioavailable (by respiration process) or dissolved OCs present in the main stem of the Missouri River.
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