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毒死蜱有毒代谢物3,5,6-TCP在土壤中的吸附-解吸研究

Keywords: 毒死蜱,,,6-TCP,吸附,解吸,风险

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Abstract:

应用OECD106批平衡方法,研究了毒死蜱的有毒代谢物3,5,6-TCP在6种典型土壤中的吸附-解吸行为。结果表明:Elovich方程、双常数方程和抛物线扩散方程能较好地拟合3,5,6-TCP在第四纪红土、黑土、黄壤和褐土中的吸附动力学过程,而对紫色土和潮沙土的拟合度较低(拟合相关系数小于0.85);应用Freundlich方程和线性方程拟合第四纪红土、黑土、黄壤和褐土的经验常数nfads均小于1(非线性吸附),而紫色土和潮沙土的nfads值则接近于1(线性吸附);3,5,6-TCP在6种土壤中解吸的滞后系数H值均大于1,即解吸速率大于吸附速率。6种土壤对3,5,6-TCP的吸附常数Kfads从1.37~6.74μg1-nf·mLnf·g-1,吸附系数Kd值从0.50~1.30mL·g-1,其中第四纪红土和黑土对其吸持力较强(Kd>1),因而更应注意环境安全;其他4种土壤的Kd值则均小于1,淋溶风险较大。

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