Competitive adsorption of chlorinated aliphatic hydrocarbons from aqueous mixtures onto soil
- Cleveland State Univ., OH (United States). Dept. of Chemical Engineering
Competitive adsorption of carbon tetrachloride, chloroform and 1,1,1-trichlorethane from aqueous mixture onto soil was investigated. The experimental data were measured through batch equilibration studies in conjunction with GC/MS analysis. Single component and multicomponent sorption isotherms were generated on three representative soil samples with different properties. Competitive effects were analyzed by comparing single component partitioning to binary and ternary solute partitioning, and were quantified in terms of selectivity of an individual compound with respect to another constituent in the mixture. Sorption linearity was observed in all cases, even in the vicinity of saturation, indicating constant retardation during the subsurface transport. Sorption of the same compound on different soils was closely related to the soil`s organic matter content. The order of sorption uptake by different soils was also consistent with the order of clay percentage and the specific surface area. It was concluded that the sorption process was governed by, both, partitioning of the compound on the soil organic matter and accumulation on the inorganic surface. Competitive sorption from multisolute solutions was within a selectivity range of 1.17--2.22. While the contaminant properties dominated the order of competition, soil properties determined its quantification. An opposite relationship between the organic matter content and the selectivity for the compound with higher polarity was observed.
- OSTI ID:
- 250925
- Report Number(s):
- CONF-9507204--
- Country of Publication:
- United States
- Language:
- English
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