||Influence of Solvent and Sorbent Characteristics on Distribution of Pentachlorophenol in Octanol-Water and Soil-Water Systems.
Lee, L. S. ;
Rao, P. S. C. ;
Nkedi-Kizza, P. ;
Delfino., J. J. ;
||Florida Univ., Gainesville.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Partition coefficients ;
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Sorbent and solvent characteristics influencing sorption of pentachlorophenol (PCP) were investigated. Analysis of aqueous sorption data for several sorbents over a broad pH range suggested hydrophobic sorption of neutral PCP predominates at pH<7. At pH>7, sorption of the pentachlorophenolate anion PCP(-1) and the formation and sorption of neutral ion pairs (such as metal cation (M(+) + PCP(-1) = MPCP(o)) were considered. The observed sorption data were described over the entire pH range with knowledge of pH, soil organic carbon content, and PCP's pKa. Increased sorption of PCP(-1) was observed with increasing ionic strength for batch sorption studies conducted in aqueous CaCl2 solutions. Octanol-water partition coefficients measured in various electrolyte solutions suggested that formation of MPCP(o) and the partitioning of PCP(-1) are influenced by the cationic species. (Copyright (c) by the American Chemical Society, 1990.)