| 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. |
| Genre: | Article |
| ProdID: | 70016339 |
| Citation Author: | Lovley, D. R.; Woodward, J. C. |
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| Citation End Page: | 929 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Consumption of freons CFC-11 and CFC-12 by anaerobic sediments and soils; 1992; Article; Journal; Environmental Science and Technology; Lovley, D. R.; Woodward, J. C. |
| Citation Start Page: | 925 |
| Citation Volume: | 26 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Consumption of freons CFC-11 and CFC-12 by anaerobic sediments and soils; 1992; Article; Journal; Environmental Science and Technology; Lovley, D. R.; Woodward, J. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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