Comparison of the in situ and desorption sediment-water partitioning of polycyclic aromatic hydrocarbons and polychlorinated biphenyls

Article Abstract:

The hypothesis that only a fraction of the total measured sediment polycyclic aromatic hydrocarbon (PAH) concentration is available for equilibrium partitioning is tested by measuring aqueous PAH concentrations in laboratory desorption experiments using subsamples of sediments from Boston Harbor, MA. The measured aqueous PAH concentrations were overestimated by as much as 100% in some cases by equilibrium partitioning models based on the total measured sediment PAH concentrations. Meanwhile, both in situ and laboratory experiments on aqueous polychlorinated biphenyl concentrations were consistent with equilibrium partitioning models.

Aromatic Hydrocarbons, Marine sediments, Polycyclic aromatic hydrocarbons

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Comment on "Seasonal Variations in Air-Water Exchange of Polychlorinated Biphenyls in Lake Superior." (comment on article by K.C. Hornbuckle, J.D. Jeremiason, C.W. Sweet and S.J. Eisenrech, Environmental Science and Technology, vol. 28, p. 1491, 1994)(inclues reply)

Article Abstract:

Hornbuckle and his colleagues stated that quantitative estimates of the atmospheric component of sources and sinks are critical to the prediction of chemical residence time, ecosystem exposure and whole-lake mass balance. However, their figures underestimate the atmospheric sources and sinks of PCBs in Lake Superior. The model used for predicting PCB vapor flux is inaccurate since it does not take into account the magnitude of each flux.

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Catalytic dechlorination of polychlorinated biphenyls

Article Abstract:

Polychlorinated biphenyls (PCB), widely used as nonflammable oils and high-temperature lubricants, are harmful to the environment and human health. A new remediation technology for addressing PCB contamination is suggested. The new method involves reductive chlorination and homogenous catalysis. It is shown that the technique is a simple, effective method for converting PCBs into harmless and biodegradable biphenyls.

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