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磺胺甲恶唑在沉积物中的降解行为研究

Keywords: 抗生素,磺胺甲恶唑,沉积物,降解

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Abstract:

为评价磺胺类抗生素在沉积物中降解行为,以最常用的磺胺类药物——磺胺甲恶唑(SMZ)为对象,通过不同的环境条件下室内模拟实验,研究了其在沉积物中的降解动态以及相关环境因素(微生物、含氧量、光照、沉积物种类和药物起始浓度等)对降解过程的影响情况。结果表明,SMZ在沉积物中的降解途径主要为兼性厌氧微生物降解,非生物降解等其他降解途径只占较小比例。SMZ的降解速率与沉积物的有机质含量密切相关,高有机质含量的沉积物中SMZ的降解更快,沉积物中的光敏剂也能促进SMZ的降解。高浓度的SMZ通过抑制沉积物微生物的活性,使得其降解显著下降。

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