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(P190) Using Co-Located Passive Samplers and Mussels to Monitor Pesticide Bioavailability.
Kohn, Nancy*,1, Crecelius, Eric1, White, Carmen2, Lincoff, Andrew3, 1 Battelle Marine Sciences Laboratory, Sequim, Washington, USA2 EPA Region IX, San Francisco, California, USA3 EPA Region IX Laboratory, Richmond, California, USA
ABSTRACT- Remedial dredging of pesticide-contaminated marine sediment from the United Heckathorn Superfund Site in Richmond, California, was conducted between September 1996 and March 1997. The long-term post-remedial monitoring program consists of annual collection of resident mussels and water samples for pesticide analysis. In the most recent year of monitoring, polyethylene passive samplers were deployed at the monitoring stations, with the objective of relating lipid-normalized tissue concentrations of high Kow chlorinated pesticides in living resident mussels with the concentrations measured in the polyethylene passive samplers. Passive samplers were deployed for four weeks in winter 2002; mussel samples were collected when the passive samplers were retrieved on March 6, 2002. Passive samplers and resident mussels detected the same pesticides and identified the same gradient in pesticide concentrations between stations. The relative proportions of individual pesticide compounds were not always consistent between passive samplers and mussels: the relative concentrations of principal pesticide components were similar at the more contaminated stations, but different at the less contaminated stations. Resident organism tissue concentrations have high ecological relevance because of the potential for trophic transfer and food-chain biomagnification, in addition to direct effects on the organism. Determining the relationship of a passive sampler measurement to an ecologically relevant parameter increases the utility of passive samplers to monitor persistent organic pollutants in the marine environment. Passive samplers can be deployed where resident organisms are sparse or absent, can be used in conjunction with sediment traps to assess particulate vs. dissolved contaminant loads, and provide a consistent uptake rate that allows long-term comparisons of water quality and bioavailability of persistent organic pollutants.
Key words: Biomonitoring, Bioavailability, Pesticides, Passive Sampler
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