Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9451240 | Chemosphere | 2005 | 10 Pages |
Abstract
Ninety strains of fungi from the collection of our mycology laboratory were tested in Galzy and Slonimski (GS) synthetic liquid medium for their ability to degrade the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) and its by-product, 2,4-dichlorophenol (2,4-DCP) at 100 mg lâ1, each. Evolution of the amounts of each chemical in the culture media was monitored by HPLC. After 5 days of cultivation, the best results were obtained with Aspergillus penicilloides and Mortierella isabellina for 2,4-D and with Chrysosporium pannorum and Mucor genevensis for 2,4-DCP. The data collected seemed to prove, on one hand, that the strains responses varied with the taxonomic groups and the chemicals tested, and, on the other hand, that 2,4-D was less accessible to fungal degradation than 2,4-DCP. In each case, kinetics studies with the two most efficient strains revealed that there was a lag phase of 1 day before the onset of 2,4-D degradation, whereas there was none during 2,4-DCP degradation. Moreover, 2,4-DCP was detected transiently during 2,4-D degradation. Finally, M. isabellina improved its degradation potential in Tartaric Acid (TA) medium relative to GS and Malt Extract (ME) media.
Keywords
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Environmental Chemistry
Authors
T. Vroumsia, R. Steiman, F. Seigle-Murandi, J.-L. Benoit-Guyod, Groupe pour l'Ãtude du Devenir des Xénobiotiques dans l'Environnement (GEDEXE) Groupe pour l'Ãtude du Devenir des Xénobiotiques dans l'Environnement (GEDEXE),