A distributed reactivity model for sorption by soils and sediments. 12: Effects of subcritical water extraction and alterations of soil organic matter on sorption equilibria
- Univ. of Michigan, Ann Arbor, MI (United States)
- Drexel Univ., Philadelphia, PA (United States). School of Environmental Science, Engineering, and Policy
- Chinese Academy of Science, Guiyang, Guizhou (China). National Key Lab. of Environmental Geochemistry
Subcritical water extraction was used as a tool to remove the carboxylic, aliphatic, and carbohydrate types of organic carbon from a humic soil. The rates and extents of soil organic carbon removal were quantified as functions of superheated water temperature, phase, and exposure time. The experimental data suggest that superheated water effects deoxygenation/aromatization reactions of soil organic matter that mimic those of geologically slow, natural diagenesis processes. Phenanthrene sorption and desorption equilibrium isotherms for the altered soils were measured. The sorption isotherms were characterized by increasing capacity and nonlinearity with increasing degree of polar functionality removal and simulated diagenesis of the soil organic matter.
- OSTI ID:
- 355494
- Journal Information:
- Environmental Science and Technology, Vol. 33, Issue 10; Other Information: PBD: 15 May 1999
- Country of Publication:
- United States
- Language:
- English
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