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环境化学  2015 

磺胺嘧啶和磺胺噻唑在土壤中的吸附行为

Keywords: 磺胺嘧啶,磺胺噻唑,土壤,泥炭,吸附

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Abstract:

采用批平衡实验方法研究磺胺嘧啶(SDZ)和磺胺噻唑(STZ)在五种典型土壤及一种泥炭中的吸附行为.结果表明(1)SDZ和STZ在土壤及泥炭中的吸附量随溶液pH值的升高而减小,与溶液中SDZ和STZ阳离子的含量呈正相关.(2)SDZ和STZ的吸附均可采用Freundlich和Langmuir模型进行拟合,最大吸附量(Qm)的大小依次为泥炭土>黑土>棕壤≥灰褐土>红壤≥灰漠土.除红壤和灰漠土外,Freundlich吸附系数(Kf)的大小次序和(Qm)基本相同.SDZ和STZ的(Qm)与土壤有机质的含量和土壤粉粒的含量呈显著正相关.因此,SDZ和STZ更容易吸附在有机质的含量比较高的泥炭土和黑土中.

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