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

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Environmental Science and Technology; (USA)

DOI:https://doi.org/10.1021/es00082a002· OSTI ID:5949660

Jafvert, C T ^[1]; Westall, J C ^[2]; Grieder, E; Schwarzenbach, R P ^[3]

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1. Environmental Protection Agency, Athens, GA (USA)
2. Oregon State Univ., Corvallis (USA)
3. Swiss Federal Institute for Water Resources and Water Pollution Control, Kastanienbaum (Switzerland)

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, CaCl{sub 2}, or MgCl{sub 2}) 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-2-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 CaCl{sub 2}) and pH, and competitive adsorption of pentachlorophenol and 2,3,4,5-tetrachlorophenol on an environmental sorbent.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5949660
• Journal Information: Environmental Science and Technology; (USA), Journal Name: Environmental Science and Technology; (USA) Vol. 24:12; ISSN ESTHA; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACETIC ACID
ALCOHOLS
AROMATICS
BUTYRIC ACID
CARBOXYLIC ACIDS
CHEMICAL REACTION KINETICS
CHEMISTRY
DATA
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
KINETICS
MEASURING METHODS
MONOCARBOXYLIC ACIDS
NITRO COMPOUNDS
NITROPHENOL
NUMERICAL DATA
OCTANOLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
POLLUTION
REACTION KINETICS
WATER CHEMISTRY
WATER POLLUTION