Degradation kinetics of manure-derived sulfadimethoxine in amended soil

被引:83
作者
Wang, QQ
Guo, MX
Yates, SR
机构
[1] USDA, ARS, George G Brown Jr Salin Lab, Riverside, CA 92507 USA
[2] Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA
[3] Delaware State Univ, Dept Agr & Nat Resources, Sagamiko, Kanagawa 19901, Japan
关键词
sulfadimethoxine; sulfonamide; antibiotic; degradation; manure; soil;
D O I
10.1021/jf052216w
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Spreading of contaminated manure into agricultural lands as fertilizer is one of the major routes through which veterinary antibiotics enter the environment. In this study, the degradation of manure-derived sulfadimethoxine, a widely used veterinary sulfonamide antibiotic, in manure-amended soil was investigated. A kinetic model, called the availability-adjusted first-order model based on the first-order kinetics and an assumption of the availability of target compound during the degradation process, was developed and was found to fit sulfadimethoxine degradation well. The effect of initial sulfadimethoxine concentration showed that the degradation rate constant increased with decreasing initial concentration, indicating that the bioactivity of the degrading microorganisms in manure-amended soil was sensitive to sulfadimethoxine concentration. Sulfadimethoxine degradation was accelerated with increasing manure content in amended soil. Degradation in nonamended soil was significantly slower than in manure-amended soil. This indicated that sulfadimethoxine may become more persistent once it reaches soil after leaching from manure and that storage of manure for a certain period before application is needed to diminish sulfadimethoxine contamination. Sulfadimethoxine degradation was effectively enhanced with increasing moisture of amended soil. No adverse effect was observed with manure storage on the degradation of manure-derived sulfadimethoxine in amended soil.
引用
收藏
页码:157 / 163
页数:7
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