Central Columbia Plateau - Yakima River Basin NAWQA Study - Publications

The Relationship between Land Use and Organochlorine Compounds in Streambed Sediment and Fish in the Central Columbia Plateau, Washington and Idaho, USA

By Mark D. Munn and Steve J. Gruber, U.S. Geological Survey, Water Resources Division
in Environmental Toxicology and Chemistry, v. 16, no. 9, p. 1877-1887, 1997


We analyzed streambed sediment and fish in the Central Columbia Plateau in eastern Washington and Idaho for organochlorine pesticides and polychlorinated biphenyls (total PCB). Our objective was to assess the effects of land use on the occurrence and distribution of these compounds; land uses in the study area included forest, dryland and irrigated farming, and urban. We detected 16 organochlorine compounds in streambed sediment and fish tissue; fish usually had more compounds and a greater frequency of detection. The most frequently detected compound was total DDT (sum of six isomers), which was found in 52% of bed sediment samples and 94% of whole fish composite samples. The other commonly detected compounds were dimethyl tetrachloroterephthalate (DCPA), dieldrin, hexachlorobenzene, and total chlordane (sum of cis- and trans-chlordane, cis- and trans-nonachlor, oxychlordane, heptachlor, and heptachlor epoxide). Forest was the only land use with no detections of organochlorine compounds in either fish or bed sediment. Hexachlorobenzene was the only organochlorine pesticide detected at concentrations that differed significantly among land uses; concentrations were higher in the dryland farming areas than in the irrigated farming or urban areas. In agricultural areas irrigated by surface water, total DDT concentrations in both streambed sediment and fish tissue were related to the percentage of land irrigated by water delivered via furrows (gravity irrigation), although total DDT was not detectable in bed sediments until gravity irrigation exceeded 30%. Because of the relation between gravity irrigation and soil erosion, our study supports the importance of controlling soil erosion in order to reduce the overall loading of organochlorine compounds to surface waters.

Central Columbia Plateau - Yakima River Basin NAWQA Study
NAWQA Program Bibliography
Water Resources of Washington State
U.S. Geological Survey
This page is http:// /pubs/ja/OC_journal.htm
Last modified: Mon May 11 12:01:57 1998