Sorption of polychlorinated biphenyls (PCB) to clay particulates and effects of desorption on phytoplankton |
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Authors: | Glynis M. Nau-Ritter Charles F. Wurster |
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Affiliation: | Marine Sciences Research Center, State University of New York, Stony Brook, NY 11794, U.S.A. |
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Abstract: | The sorption of polychlorinated biphenyls (PCB) on illite and chlorite, two minerals of defined composition, was investigated. Illite particles adsorbed higher [14C]PCB (Aroclor 1254) concentrations than did chlorite particles, with equilibrium concentration factors between particles and water being 1.4 × 104 for illite and 1.0 × 104 for chlorite. Desorbed PCB inhibited photosynthesis and reduced chlorophyll-a content of natural phytoplankton assemblages within dialysis membrane bags suspended in the water of a tidal marsh. There was no significant difference in effects on the phytoplankton of PCB desorbed from the two minerals. The rate of [14C]PCB desorption was dependent on the initial concentration on the clay particles. The rate of [14C]PCB loss from bags with particles was slower than that from bags without particles. |
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