Distribution of hydrophobic ionogenic organic compounds between octanol and water: organic acids

Octanol-water partition coefficients were determined for 10 environmentally significant organic acids (PCP, TeCP, 2,4,5,-T, DDA, DNOC, 2,4-D, 2,4-DB, dicamba, fenac and silvex) as a function of aqueous phase salt concentration (0.05-0.2 M lithium chloride, sodium chloride, potassium chloride, calciu...

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Bibliographic Details
Published in:Environmental science & technology 1990-12, Vol.24 (12), p.1795-1803
Main Authors: Jafvert, Chad T, Westall, John C, Grieder, Erwin, Schwarzenbach, Rene P
Format: Article
Language:English
Subjects:
540320 - Environment, Aquatic- Chemicals Monitoring & Transport- (1990-)
ACETIC ACID
ALCOHOLS
Applied sciences
AROMATICS
Biological and physicochemical phenomena
BUTYRIC ACID
CARBOXYLIC ACIDS
CHEMICAL REACTION KINETICS
CHEMISTRY
DATA
ENVIRONMENTAL SCIENCES
Exact sciences and technology
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
KINETICS
MEASURING METHODS
MONOCARBOXYLIC ACIDS
Natural water pollution
NITRO COMPOUNDS
NITROPHENOL
NUMERICAL DATA
OCTANOLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
POLLUTION
REACTION KINETICS
WATER CHEMISTRY
WATER POLLUTION
Water treatment and pollution
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Summary:Octanol-water partition coefficients were determined for 10 environmentally significant organic acids (PCP, TeCP, 2,4,5,-T, DDA, DNOC, 2,4-D, 2,4-DB, dicamba, fenac and silvex) as a function of aqueous phase salt concentration (0.05-0.2 M lithium chloride, sodium chloride, potassium chloride, calcium chloride and magnesium chloride) and pH. An equilibrium model that described 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, was used to quantitatively interpret the results. The distribution of DNOC (2-methyl-4,6-dinitrophenol) on a natural sorbent as a function of salt concentration and pH, and the competitive adsorption on an environmental sorbent of PCP (pentachlorophenol) and TeCP (2,3,4,5-tetrachlorophenol) were studied in the context of a further understanding of the distribution of ionogenic compounds in the environment.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00082a002