1. ASSESSING EXPOSURE OF SEDIMENT BIOTA TO ORGANIC CONTAMINANTS BY THIN-FILM SOLID PHASE EXTRACTION.
- Author
-
MELOCHE, LIZANNE M., DEBRUYN, ADRIAN M. H., OTTON, S. VICTORIA, IKONOMOU, MICHAEL G., and GOBAS, FRANK A. P. C.
- Subjects
COASTAL organisms ,BIOAVAILABILITY ,CONTAMINATED sediments ,THIN films ,SOLID phase extraction ,EXTRACTION techniques ,PARTITION coefficient (Chemistry) ,BIOACCUMULATION ,MACOMA baltica - Abstract
Differences in bioavailability among sediments are a source of variability and uncertainty in sediment quality assessment. We present three sets of studies designed to test a thin-film solid phase extraction technique for characterizing the bioavailability of organic chemicals in sediments. Laboratory studies with spiked natural sediments reveal highly reproducible thin-film extractions for chemicals with octanol-water partition coefficients between 10
4.5 and 108.5 , with 95% equilibration times between 1 and 600 h. Studies with field-collected sediments illustrate that method detection limits are sufficiently low for field application at contaminated sites. Bioaccumulation studies with clams (Macoma balthica) show excellent correlations between thin-film and animal tissue concentrations. We conclude that thin-film extraction provides an ecologically relevant, fugacity-based measure of chemical exposure that can be expected to improve sediment quality assessments. [ABSTRACT FROM AUTHOR]- Published
- 2009
- Full Text
- View/download PDF