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INFLUENCE OF SOLVENT AND SORBENT CHARACTERISTICS ON DISTRIBUTION OF PENTACHLOROPHENOL IN OCTANOL-WATER AND SOIL-WATER SYSTEMS
Lee, L. S., P. Suresh, C. Rao, P. NkediKizza, AND J. J. Delfino. INFLUENCE OF SOLVENT AND SORBENT CHARACTERISTICS ON DISTRIBUTION OF PENTACHLOROPHENOL IN OCTANOL-WATER AND SOIL-WATER SYSTEMS. ENVIRONMENTAL SCIENCE & TECHNOLOGY 24(5):654-661, (1990).
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) and the formation and sorption of neutral ion pairs [e.g., metal cation (M') + (PCP-) = MPCPO] was considered. The observed sorption data were described over the entire pH range with knowledge of pH, soil organic carbon content, and PCP's pK,. Increased sorption of PCP- was observed with in- creasing ionic strength for batch sorption studies con- ducted in aqueous CaClz solutions. Octanol-water par- tition coefficients measured in various electrolyte solutions suggested that formation of MPCPO and the partitioning of PCP- are influenced by the cationic species. Batch sorption studies conducted in methanol-water solutions suggest the predominance of solute-solvent interactions in the sorption of both the neutral and ionized forms of PCP; sorption decreased in a log-linear manner with in- creasing methanol fractions.
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Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
SUBSURFACE PROTECTION AND REMEDIATION DIVISION
SUBSURFACE REMEDIATION BRANCH