罗克沙砷在粉质壤土中的降解及其毒性评估。
Degradation of roxarsone in a silt loam soil and its toxicity assessment.
机构信息
Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China; School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
出版信息
Chemosphere. 2014 Oct;112:128-33. doi: 10.1016/j.chemosphere.2014.03.103. Epub 2014 May 5.
The land application of poultry or swine litter, containing large amounts of roxarsone, causes serious arsenic pollution in soil. Understanding biotransformation process of roxarsone and its potential risks favors proper disposal of roxarsone-contaminated animal litter, yet remains not achieved. We report an experimental study of biotransformation process of roxarsone in a silt loam soil under various soil moisture and temperature conditions, and the toxicity of roxarsone and its products from degradation. Results showed that soil moisture and higher temperature promoted roxarsone degradation, associating with emergent pentavalent arsenic. Analysis of fluorescein diacetate (FDA) hydrolysis activity revealed that roxarsone does not exert acute toxic on soil microbes. With the release of inorganic arsenic, FDA hydrolysis activity was inhibited gradually, as evidenced by ecotoxicological assessment using Photobacterium leiognathi. The results shade new lights on the dynamic roxarsone biotransformation processes in soil, which is important for guiding appropriate disposal of poultry or swine litter in the environment.
禽畜粪便（含有大量洛克沙砷）的土地应用导致土壤中砷的严重污染。了解洛克沙砷的生物转化过程及其潜在风险有利于洛克沙砷污染动物粪便的妥善处理，但尚未实现。我们报告了在不同土壤水分和温度条件下，壤土中洛克沙砷生物转化过程及其降解产物毒性的实验研究。结果表明，土壤水分和较高温度促进了洛克沙砷的降解，同时伴随着五价砷的出现。荧光素二乙酸酯（FDA）水解活性分析表明，洛克沙砷对土壤微生物没有急性毒性。随着无机砷的释放，FDA 水解活性逐渐受到抑制，这可以通过发光细菌法进行生态毒理学评估得到证明。这些结果为土壤中洛克沙砷的动态生物转化过程提供了新的认识，这对于指导禽畜粪便在环境中的妥善处理具有重要意义。
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