Influence of Solvent and Sorbent Characteristics on Distribution ofPentachlorophenol in Octanol-Water and Soil-Water Systems

摘要

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.)