| Autor: |
Muller, Markus D., Angst, Werner, Zipper, Christian, Fleischmann, Thomas, Kohler, Hans-Peter E., Bolliger, Christof, Suter, MarcJ.-F. |
| Předmět: |
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| Zdroj: |
Biodegradation; 1999, Vol. 10 Issue 4, p271, 0p |
| Abstrakt: |
Aerobic degradation experiments with the racemic mixtures of mecoprop and dichlorprop revealed that activated sludge collected from the aeration tank of a municipal waste water treatment plant degraded bothenantiomers of mecoprop and dichlorprop within 7 days, albeit in an enantioselective manner; the (S) enantiomers were preferentially degraded. Mecoprop, dichlorprop, and 2,4-D were completely metabolized under aerobic conditions, as shown by the 86-98% elimination of dissolved organic carbon. Under anaerobic conditions, the concentration of 2,4-D decreased exponentially with a first-order reaction rate constant of 0.24 per day and without a lag-phase. After an incubation time of 17 days, 2,4-D was completely removed. 2,4-Dichlorophenol was the main metabolite of anaerobic 2,4-D degradation; only traces of 4-chlorophenol were detected. In contrast, the chiral phenoxypropionic acid herbicides mecoprop and dichlorprop persisted under anaerobic conditions during 49 days of incubation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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