Assessment of the sediment chlordane levels in McLoud Run, Cedar Rapids, Iowa

CHED 815

Josh R Dettman and Marty St. Clair.
The chlordane concentrations in the sediments of McLoud Run, an urban cold-water trout stream, were determined using an immunoassay screening followed by GC-MS analysis of selected sites. Sediment samples were collected that appeared to be high in organic carbon content. All samples were analyzed with an immunoassay screening technique specific to chlordane and for organic carbon content. Four sites were identified to have high chlordane levels. The sediments from the four sites (S1, S7, S17, and S20) were Soxhlet extracted and analyzed by GC-MS. The concentrations of those sites were determined to be (in ppb): S1= 7.5(±1.3)x102, S7= 9(±4)x102, S17= 1.6(±0.8)x103, and S20= 1.7(±1.0)x103. The chlordane concentrations increased moving upstream from the less developed portion of McLoud Run towards the residential portion.