Degradation potential of S-metolachlor in an artificial wetland ecosystem: microcosm assessment
2011
Hoyos, C. | Bize, A. | Bouchez, T. | Mazeas, L. | Passeport, E. | Tournebize, J.
A new method to estimate the biodegradation potential of S-metolachlor, in an artificial wetland ecosystem (AWE) in Bray, France, was developed. For that propose, batch experiments were performed with sediments collected from AWE. The half-life of S-metolachlor was determined under biotic and abiotic conditions (sterile microcosms), aerobic and anoxic conditions and in the presence of different carbon sources (crush plants or acetate). One assay was performed without any carbon source. The results suggest that the S-metolachlor degradation is a biotic phenomenon catalyzed by microorganisms. There is a significant decrease of the half-lives in the biotic microcosm (15.5 days in the case of the aerobic microcosm and 20.5 days in the anoxic) comparing to the sterile microcosms (60.2 days in the case of the aerobic and 45.5 days in the anoxic) (P
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