| Autor: |
Ronald F. Probstein, Richard A. Jacobs, R. Edwin Hicks, Mehmet Z. Sengun |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology. 29:1933-1955 |
| ISSN: |
1077-1204 |
| DOI: |
10.1080/10934529409376157 |
| Popis: |
The dominant transport process for removing charged species from soils by electric fields is electromigration. In the case of heavy metals, the polarity and magnitude of the charge depends on the pH. Positive ions are generally stable at low pH and negatively charged complexes dominate at high pH. The transport is further complicated by the strong dependence of solubility on pH, with many heavy metals being virtually insoluble in moderately alkaline conditions. It was found experimentally that under certain conditions, strong pH gradienis can develop in the soil trapping the metals by a process of isoelectric focusing, A numerical model of the transport and electrochemical processes was extended for the first time to incorporate complexation and precipitation reactions and was found to closely reproduce the experimental findings. The model demonstrates the role played by background ions and electroneutrality in governing the distribution of species, and how the concomitant variations in the elect... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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