Abstract:
:Quantitative mussel biomonitoring studies often use laboratory-measured whole-body elimination rate coefficients (k(tot) in conjunction with concentration data from field-deployed mussels to estimate bioavailable steady-state contaminant concentrations (C(m(ss)) in aquatic systems. However, the validity of applying laboratory k(tot) values to field-deployed mussels has not been verified. The present study quantified in situ k(tot) values by the common mussel biomonitor species Elliptio complanata for a group of performance reference compound polychlorinated biphenyl (PCB) congeners (International Union of Pure and Applied Chemistry 23, 61, 109, and 173) at 11 sites along the Lake Huron-Lake Erie corridor (southeast MI, USA, and southwest ON, Canada). Predictive site-specific k(tot) versus log K(ow) relationships were derived to estimate in situ k(tot) values for the bioaccumulated environmental PCB congeners, and the resultant steady-state concentration estimates were compared against values estimated using laboratory-derived k(tot) values. In situ k(tot) values were almost always faster (1.3-10-fold) than rate coefficients determined by laboratory studies, with a mean difference +/- standard error of 3.89 +/- 0.28-fold. Consequently, control adjusted steady-state concentrations of sum PCBs in the mussels were overestimated by factors ranging from 1.30 to 3.45 across sites when using laboratory-derived k(tot) values in place of in situ k(tot) values and a field deployment period of 90 d. This error was shown to increase with increasing congener hydrophobicity, as represented by their log K(ow) values, and when shorter field deployment times are performed. To more accurately predict the steady-state concentrations of environmentally accumulated PCBs in mussels, it is recommended that future quantitative biomonitoring studies employ the reference compound approach for measuring site-specific in situ k(tot) values.
journal_name
Environ Toxicol Chemjournal_title
Environmental toxicology and chemistryauthors
Raeside AA,O'Rourke SM,Drouillard KGdoi
10.1897/08-115.1subject
Has Abstractpub_date
2009-02-01 00:00:00pages
434-45issue
2eissn
0730-7268issn
1552-8618pii
08-115journal_volume
28pub_type
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