Citation:

FANG, Y. AND S. R. AL-ABED. PARTITIONING, DESORPTION, AND DECHLORINATION OF A PCB CONGENER IN SEDIMENT SLURRY SUPERNATANTS. J. Schnoor (ed.), ENVIRONMENTAL SCIENCE AND TECHNOLOGY. American Chemical Society, Washington, DC, 41(17):6253-6258, (2007).

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Partitioning and desorption played specific roles in the dechlorination of 2-chlorobiphenyl (2-ClBP) in sediment slurry supernatants, which are suspensions of disssolved organic matter(DOM). In short-term experiments, the partition coefficient (K_p) was related to the apparent dechlorination rate constant. The K_p value (160 L g_DOC^-I), which is independent on the DOM concentration, was determined based on the decrease of the apparent rate constant with increase of the DOM concentration. In the long-term experiments, the overall rate of dechlorination can be described with a two-compartment model. The time constant for the sediment compartment was related to K_p and the desorption rate constant (k_d). The k_d value (0.21 h^-I) was determined based on the decrease of the time constant values with an increasing DOM concentration. The use of DOM suspensions allowed a short time for equilibrium. Separation of the aqueous and DOM phases was not needed due to the dechlorination of 2-ClBP. The fundamental relationships between the overall dechlorination rate constant and properties of the contaminant and sediment were established.

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