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SORPTION OF ORGANIC ACID COMPOUNDS TO SEDIMENTS: INITIAL MODEL DEVELOPMENT
Citation:
Jafvert, C. SORPTION OF ORGANIC ACID COMPOUNDS TO SEDIMENTS: INITIAL MODEL DEVELOPMENT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/172 (NTIS PB91144980).
Description:
The adsorption to sediments and soils of selected organic acid compounds was examined as a function of compound and sediment properties. ntrinsic compound properties examined included the dissociation constant (pKa) and hydrophobic character. roperties of the sediment examined included ionic strength and composition, organic carbon content and aqueous phase pH. y varying these properties, adsorption of both the neutral and anionic forms of these compounds was shown to occur. dsorption of the neutral species occurs similarly to that of other hydrophobic compounds that do not contain acidic function groups. dsorption of the anionic species was influenced, however, by intrinsic chemical as well as electrostatic factors. dsorption of the anionic species to a specific sediment was modeled as a linearly dependent function of pH. ompounds used in this study included 2,4-dinitro-o-cresol (DNOC), 2-(2,4,5-trichlorophenoxy)propanoic acid (silvex), pentachlorophenol (PCP), 4-chloro-a-(4-chlorophenyl)benzeneacetic acid (DDA) and 4-(2,4-dichlorophenoxyObutyruc acid (2,4-DB).