||Sorption of Organic Acid Compounds to Sediments: Initial Model Development.
Jafvert, C. T. ;
||Environmental Research Lab., Athens, GA. Office of Research and Development.
Organic acids ;
Chemical water pollutants ;
Chemical properties ;
Trichlorophenoxy propanoic acid ;
Chloro-alpha-chlorophenyl benzeneacetic acid ;
Dichlorophenoxybutyric acid ;
DDA insecticide ;
PCP herbicide ;
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||The adsorption to sediments and soils of selected organic acid compounds was examined as a function of compound and sediment properties. Intrinsic compound properties examined included the dissociation constant (pKa) and hydrophobic character. Properties of the sediment examined included ionic strength and composition, organic carbon content and aqueous phase pH. By varying these properties, adsorption of both the neutral and anionic forms of these compounds was shown to occur. Adsorption of the neutral species occurs similarly to that of other hydrophobic compounds that do not contain acidic functional groups. Adsorption of the anionic species was influenced, however, by intrinsic chemical as well as electostatic factors. Adsorption of the anionic species to a specific sediment was modeled as a linearly dependent function of pH. Compounds used in this study included 2,4-dinitro-o-cresol (DNOC), 2-(2,4,5-trichlorophenoxy)propanoic acid (silvex), pentachlorophenol (PCP), 4-chloro-alpha-(4-chlorophenyl)benzeneacetic acid (DDA) and 4-(2,4-dichlorophenoxy-butyric acid (2,4-DB).
||Pub. in Environmental Toxicology and Chemistry, v9 n10 p1259-1268 Oct 90.
|NTIS Title Notes
||Reprint: Sorption of Organic Acid Compounds to Sediments: Initial Model Development.
||PC A03/MF A01