Sorption of Chlorobiphenyls in Sediment—Water Systems Containing Nonionic Surfactants
1999
Park, Jae Woo | Boyd, Stephen A.
Nonionic surfactants may aid remediation of contaminated soils and sediments by increasing aqueous concentrations of poorly water-soluble organic contaminants. In order to explore the effects of nonionic surfactants on the sediment—water distribution of PCBs, a series of batch experiments was performed using four commercial nonionic surfactants (Triton X-100, Triton X-405, Triton X-705, and Tween 80) and Red Cedar River sediment. Sediment—water distributions of 4,4′-dichlorobiphenyl (Di-CB), 2,2′,4,4′-tetrachlorobiphenyl (Tetra-CB), and 2,2′,4,4′,5,5′-hexachlorobiphenyl (Hexa-CB) were studied at aqueous surfactant concentrations ranging from zero to >1.5 times the critical micelle concentration (CMC) of each surfactant. The results show decreases in apparent soil—water distribution coefficients (K*) of PCB congeners at all surfactant concentrations as compared to the intrinsic sorption coefficient (K) in the absence of surfactant, unlike that previously reported. A new model incorporating a surface micellization concept for the sorbed surfactant phase was successfully applied to experimental data presented here and in a previous study.
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