Chromatographic models for the sorption of neutral organic compounds by soil from water and air.
The solvation parameter model is used to construct models for the estimation of the soil-water and soil-air distribution constants and to characterize the contribution of fundamental intermolecular interactions to the underlying sorption processes. Wet soil is shown to be quite cohesive and polar but relatively non-selective for dipole-type, lone-pair electron and hydrogen-bond interactions. Using a comparison of system constant ratios chromatographic systems employing reversed-phase liquid chromatography on polar bonded phases are shown to provide suitable models for estimating soil-water distribution constants. No suitable gas chromatographic models were found for the soil-air distribution constant but the requirements for such a system are indicated. Models are also provided for adsorption at the air-water interface. Estimation methods based on either the solvation parameter model or chromatographic model reproduce experimental distribution constants for a wide variety of compounds with a similar error (0.2-0.3 log units) to that expected in the experimental data.
Chemistry Department, Parke-Davis Pharmaceutical Research Division, Warner-Lambert Company, Ann Arbor, MI 48105, USA.
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D000327:Adsorption; D000388:Air / Q000032:analysis*; D000393:Air Pollutants / Q000737:chemistry; D002845:Chromatography; D008433:Mathematics; D008956:Models, Chemical; D009930:Organic Chemicals / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis; D014867:Water / Q000737:chemistry*; D014873:Water Pollutants / Q000032:analysis
D000393:Air Pollutants; D009930:Organic Chemicals; D012987:Soil; D012989:Soil Pollutants; D014873:Water Pollutants; D014867:Water