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Biotic and abiotic degradation of four cephalosporin antibiotics in a lake surface water and sediment.
- Source :
-
Chemosphere [Chemosphere] 2010 Sep; Vol. 80 (11), pp. 1399-405. Date of Electronic Publication: 2010 Jun 25. - Publication Year :
- 2010
-
Abstract
- Cephalosporins are widely used veterinary and human antibiotics, but their environmental fate and impacts are still unclear. We studied degradation of four cephalosporins (cefradine, cefuroxime, ceftriaxone, and cefepime) from each generation in the surface water and sediment of Lake Xuanwu, China. The four cephalosporins degraded abiotically in the surface water in the dark with half-lives of 2.7-18.7d, which were almost the same as that in sterilized surface water. Under exposure to simulated sunlight, the half-lives of the cephalosporins decreased significantly to 2.2-5.0d, with the maximal decrease for ceftriaxone from 18.7d in the dark to 4.1d under the light exposure. Effects of dissolved organic matter (DOM) and nitrate on photodegradation of the cephalosporins were compound-specific. While DOM (5 mg L(-1)) stimulated the photodegradation of only cefradine (by 9%) and cefepime (by 34%), nitrate (10 microM) had effects only on cefepime (stimulation by 13%). Elimination rates of the cephalosporins in oxic sediment (half-lives of 0.8-3.1d) were higher than in anoxic sediment (half-lives of 1.1-4.1d), mainly attributed to biodegradation. The data indicate that abiotic hydrolysis (for cefradine, cefuroxime, and cefepime) and direct photolysis (for ceftriaxone) were the primary processes for elimination of the cephalosporins in the surface water of the lake, whereas biodegradation was responsible for the elimination of the cephalosporins in the sediment. Further studies are needed on chemical structure, toxicity, and persistence of transformation products of the cephalosporins in the environment.<br /> (Copyright © 2010 Elsevier Ltd. All rights reserved.)
- Subjects :
- Aerobiosis
Anti-Bacterial Agents analysis
Anti-Bacterial Agents chemistry
Biodegradation, Environmental
Cefepime
Ceftriaxone analysis
Ceftriaxone chemistry
Ceftriaxone metabolism
Cefuroxime analysis
Cefuroxime chemistry
Cefuroxime metabolism
Cephalosporins analysis
Cephalosporins chemistry
Cephradine analysis
Cephradine chemistry
Cephradine metabolism
Fresh Water microbiology
Geologic Sediments microbiology
Nitrates chemistry
Oxygen chemistry
Photolysis
Water Pollutants, Chemical analysis
Water Pollutants, Chemical chemistry
Anti-Bacterial Agents metabolism
Cephalosporins metabolism
Fresh Water chemistry
Geologic Sediments chemistry
Water Pollutants, Chemical metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1298
- Volume :
- 80
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 20579689
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2010.05.048