Accumulation of organochlorine pesticides and PCBs by semipermeable membrane devices and Mytilus edulis in New Bedford Harbor

Article Abstract:

The accumulation of contaminants, including organochlorine and PCBs, by aquatic species vary according to the physical, chemical, and biological processes that affect exposure concentrations, contaminant bioavailability, and the organism's physiological state. Semipermeable membrane devices, a sampling methods based on the use of indigenous or transplanted bivalve mollusks, offer a possible way for estimating total exposure concentrations without much inconsistency that may result from the above problems.

Research and Development in the Physical, Engineering, and Life Sciences, Water Pollution Control R&D, Chlorinated Aromatics, Methods, Aromatic compounds, Water pollution research, Organochlorine compounds, Organic chlorine compounds, Water quality bioassay

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A kinetics model for predicting the accumulation of PCBs in phytoplankton

Article Abstract:

A predictive model for the accumulation of polychlorinated biphenyls (PCBs) in phytoplankton that incorporates the dynamics of the process is developed and tested. An evaluation of the model's performance revealed that it made a significantly better reproduction of the observed accumulation of PCBs in phytoplankton compared to the traditional equilibrium model. Its increased predictiveness, which is attributed to the use of a phytoplankton growth parameter, was observed during periods of intense growth.

Models, Chemical reaction, Rate of, Chemical kinetics, Phytoplankton, Biochemical toxicology

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Settling removal rates of PCBs into the Northwestern Atlantic derived from 238U-234Th disequilibria

Article Abstract:

Particle decomposition and/or compound desorption appear to have caused the decrease in the fraction of polychlorinated chlorobiphenyls (PCBs) settling flux that approaches the sediments with both water column depth and with aqueous solubility of the congeners. Congeners with increasing chlorination, on the other hand, may have caused the sharp decrease in 234 Th-derived surface ocean fluxes far from the continental source.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Administration of Air and Water Resource and Solid Waste Management Programs, Uranium Metal, Thorium, Oceans Pollution, Environmental aspects, Water pollution control, Uranium, Marine pollution, Oceanographic research, North Atlantic Ocean

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