Sorption Equilibria of Vapor Phase Organic Pollutants on Unsaturated Soils and Soil Minerals
Abstract
Most groundwater pollutants are volatile organic compounds; however, there is relatively little understanding of the sorption reactions that control the transport and fate of organic vapors in the vadose zone. This investigation identified the physical/chemical properties of the soil matrix and organic vapors which control vapor-solid phase distribution. The dominant property which regulates vapor sorption in the unsaturated zone is the moisture content of the soil. Under very dry conditions, soil mineral/vapor interactions are regulated by specific surface area, indicating the dominance of a relatively non-specific physical adsorption process. However, at moisture contents exceeding an average surface coverage of four to eight layers of water, vapor uptake is controlled by partitioning reactions into soil moisture and soil organic matter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1990
- Accession Number
- ADA242161
Entities
People
- Jean L. Swager
- Leonard W. Lion
- Say K. Ong
- Sharon R. Linder
- Steven J. Schwager
Organizations
- Cornell University School of Civil and Environmental Engineering