Soil Sorption of Organic Vapors and Effects of Humidity on Sorptive Mechanism and Capacity

Cary T. Chiou, Thomas D. Shoup

研究成果: Article同行評審

314 引文 斯高帕斯(Scopus)

摘要

Vapor sorption isotherms on dry Woodburn soil at 20-30 °C were determined for benzene, chlorobenzene, p-di-chlorobenzene, m-dichlorobenzene, 1,2,4-trichlorobenzene, and water as single vapors and for benzene, m-dichlorobenzene, and 1,2,4-trichlorobenzene as functions of relative humidity (RH). Isotherms for all compounds on dry soil samples are distinctively nonlinear, with water showing the greatest capacity. Water vapor sharply reduced the sorption capacities of organic compounds with the dry soil; on water-saturated soil, the reduction was about 2 orders of magnitude. The markedly higher sorption of organic vapors at subsaturation humidities is attributed to adsorption on the mineral matter, which predominates over the simultaneous uptake by partition into the organic matter. At about 90% RH, the sorption capacities of organic compounds become comparable to those in aqueous systems. The effect of humidity is attributed to adsorptive displacement by water of organics adsorbed on the mineral matter. A small residual uptake is attributed to the partition into the soil-organic phase that has been postulated in aqueous systems. The results are essentially in keeping with the model that was previously proposed for sorption on the soil from water and from organic solvents.

原文English
頁(從 - 到)1196-1200
頁數5
期刊Environmental Science and Technology
19
發行號12
DOIs
出版狀態Published - 1985 12月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 環境化學

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