Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 542, Issue -, Pages 706-715Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2015.10.140
Keywords
Sulfamethoxazole; Biotransformation; Mineralization; Redox potential; Metabolite
Categories
Funding
- Spanish Ministry of Science and Innovation through HOLSIA [CTM2013-46750-R]
- Xunta de Galicia through MicroDAN [EM 2012/087]
- Fundacion Segundo Gil Davila
- Fundacion Barrie
- FEDER
- Swiss National Science Foundation [200021_135428]
- Swiss National Science Foundation (SNF) [200021_135428] Funding Source: Swiss National Science Foundation (SNF)
Ask authors/readers for more resources
C-14-sulfamethoxazole biotransformation, sorption and mineralization was studied with heterotrophic and autotrophic biomass under aerobic and anoxic conditions, as well as with anaerobic biomass. The C-14-radiolabelled residues distribution in the solid, liquid and gas phases was closely monitored along a total incubation time of 190 h. Biotransformation was the main removal mechanism, mineralization and sorption remaining below 5% in all the cases, although the presence of a carbon source exerted a positive effect on the mineralization rate by the aerobic heterotrophic bacteria. In fact, an influence of the type of primary substrate and the redox potential was observed in all cases on the biotransformation and mineralization rates, since an enhancement of the removal rate was observed when an external carbon source was used as a primary substrate under aerobic conditions, while a negligible effect was observed under nitrifying conditions. In the liquid phases collected from all assays, up to three additional peaks corresponding to C-14-radiolabelled residues were detected. The highest concentration was observed under anaerobic conditions, where two radioactive metabolites were detected representing each around 15% of the total applied radioactivity after 180 h incubation. One of the metabolites detected under anoxic and anaerobic conditions, is probably resulting from ring cleavage of the isoxazole ring. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available