Consumption of freons CFC-11 and CFC-12 by anaerobic sediments and soils
Environmental Science & Technology
By: Derek R. Lovley and J.C. Woodward
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Abstract
A variety of anaerobic sediments and soils consumed CFC-11 (CFCl3) and CFC-12 (CF2Cl2). An aerobic soil did not. Active microbial metabolism was required for CFC-12 uptake in all of the sediments examined. CFC-11 uptake was faster in the presence of microbial activity, but reduced components in the sediments also resulted in nonenzymatic CFC-11 consumption in most instances. CFC-12 uptake in a culture of Clostridium pasteurianum provided a model for the sediment uptake of CFC-11 and CFC-12 that required active microbial metabolism. Consumption of CFC-11 in the presence of reduced hematin demonstrated a potential mechanism for nonenzymatic CFC-11 consumption. These findings demonstrate that CFC-11 and CFC-12 are not biochemically inert under anaerobic conditions. This suggests that anaerobic degradation of CFC-11 and CFC-12 in anaerobic landfills might prevent some disposed CFC-11 and CFC-12 from entering the atmosphere. The results also suggest that CFC-11 and CFC-12 cannot be used as stable tracers in anaerobic environments. Furthermore, although the microbial sink for atmospheric CFC-11 and CFC-12 is much less than current anthropogenic release, this sink could have a significant long-term effect on the amount of CFC-11 and CFC-12 reaching the stratosphere.
Suggested Citation
Lovley, D.R., and Woodward, J., 1992, Consumption of freons CFC-11 and CFC-12 by anaerobic sediments and soils: Environmental Science & Technology, v. 26, no. 5, p. 925-929, https://doi.org/10.1021/es00029a009.
ISSN: 1520-5851 (online)
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Consumption of freons CFC-11 and CFC-12 by anaerobic sediments and soils |
| Series title | Environmental Science & Technology |
| DOI | 10.1021/es00029a009 |
| Volume | 26 |
| Issue | 5 |
| Publication Date | May 01, 2002 |
| Year Published | 1992 |
| Language | English |
| Publisher | ACS |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 5 p. |
| First page | 925 |
| Last page | 929 |