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RECORD NUMBER: 46 OF 207

OLS Field Name OLS Field Data
Main Title Distribution of Hydrophobic Ionogenic Organic Compounds between Octanol and Water: Organic Acids.
Author Jafvert, C. T. ; Westall, J. C. ; Grieder, E. ; Schwarzenbach, R. P. ;
CORP Author Environmental Research Lab., Athens, GA. ;Oregon State Univ., Corvallis. Dept. of Chemistry. ;Eidgenoessische Anstalt fuer Wasserversorgung, Abwasserreinigung und Gewaesserschultz, Duebendorf (Switzerland).
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/453;
Stock Number PB91-183368
Additional Subjects Water pollution ; Sorbents ; Organic compounds ; Water chemistry ; Environmental research ; Sediments ; Soil science ; Ion exchanging ; Adsorption ; Desorption ; Mathematical models ; pH ; Chemical equilibrium ; Octanol ; Chlorine organic compounds ; Acids ; Reaction kinetics ; Reprints ; Chemical reaction mechanisms ; Phenol/methyl-dinitro ; Activity coefficients ; CAS Registry No: 7732-18-5 ; 111-87-5
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NTIS  PB91-183368 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1991
Collation 11p
Abstract
The octanol-water distributions of 10 environmentally significant organic acid compounds were determined as a function of aqueous-phase salt concentration (0.05-0.2 M LiCl, NaCl, KCl, CaCl2, or MgCl2) and pH. The compounds were pentachlorophenol, 2,3,4,5-tetrachlorophenol, (2,4,5-trichlorophenoxy)acetic acid, 4-chloro-alpha-(4-chlorophenyl)benzeneacetic acid, 2-methyl-4,6-dinitrophenol, (2,4-dichlorophenoxy)acetic acid, 4-(2,4-dichlorophenoxy)butanoic acid, 3,6-dichloro-e-methoxybenzoic acid, 2,3,6-trichlorobenzeneacetic acid, and 2-(2,4,5-trichlorophenoxy)propionic acid. The experimental results were interpreted quantitatively with an equilibrium model that accounts for acid dissociation in the aqueous phase and partitioning into the octanol phase by the neutral organic species, free inorganic and organic ions, and ion pairs. The partition constants for the neutral ion pairs correlate well with the partition constants of the neutral acids. Two experiments address the applicability of these octanol-water distribution data to the distribution of ionogenic compounds in the environment: the distribution of 2-methyl-4,6-dinitrophenol on a natural sorbent as a function of salt concentration (NaCl and CaCl2) and pH, and competitive adsorption of pentachlorophenol and 2,3,4,5-tetrachlorophenol on an environmental sorbent. (Copyright (c) 1990 American Chemical Society.)