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- Title
BIOAVAILABILITY OF THE ORGANOPHOSPHOROUS INSECTICIDE CHLORPYRIFOS TO THE SUSPENSION-FEEDING BIVALVE, MERCENARIA MERCENARIA, FOLLOWING EXPOSURE TO DISSOLVED AND PARTICULATE MATTER.
- Authors
Bejarano, Adriana C.; Widenfalk, Anneli; Decho, Alan W.; Chandler, G. Thomas
- Abstract
Under estuarine conditions, hydrophobic pesticides undergo physical/chemical partitioning into dissolved and particulate fractions of sediments. Our experimental study using 14C-chlorpyrifos (14C-CHPY) showed that sorptive associations of this common insecticide with particulate (>0.2 µm) and dissolved fractions (<0.2 µm) of sediments strongly influenced uptake, tissue absorption, and elimination in the estuarine bivalve Mercenaria mercenaria. Bivalves were fed algae mixed with particulate and dissolved fractions of 14C-CHPY-contaminated estuarine sediment particles, components of estuarine sediments (silica, humic acids), and a naturally occurring food source (phytoplankton) to quantify relative uptake, tissue absorption efficiencies, and elimination of 14CCHPY. Measurements of 14C-CHPY tissue absorption efficiencies (AE%) indicated that particle source qualities influenced much of the insecticide bioavailability. Mean tissue AE% of 14C-CHPY associated with different particulate fractions ranged from 23 to 31%, while uptake from the dissolved/colloidal forms resulted in low (7-17%) AE%. Our data indicated that 14C-CHPY is more likely to bioaccumulate through ingestion of contaminated particulate material than through filtration/ingestion of dissolved/colloidal material. The high selectivity and digestibility of algae particles by M. mercenaria, a potentially ingested food source, may play an important role in the bioavailability of chlorpyrifos in this animal.
- Subjects
ESTUARINE ecology; PESTICIDES; INSECTICIDES; NORTHERN quahog; CLAMS
- Publication
Environmental Toxicology & Chemistry, 2003, Vol 22, Issue 9, p2100
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1897/02-293