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石灰性黄壤腐植酸对毒死蜱的水解影响及吸附特征

Keywords: 毒死蜱,黄壤腐植酸,吸附,水解

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Abstract:

试验采用平衡振荡法研究了三峡库区重庆开县石灰性黄壤腐植酸对毒死蜱的水解影响及吸附特征。结果表明,腐植酸可促进毒死蜱的水解,腐植酸浓度为0和480mg·L-1时,毒死蜱的水解半衰期分别为365min和187min。腐植酸对毒死蜱的吸附行为均可用Linear方程和Freundlich方程来描述,拟合效果均达显著水平,毒死蜱在腐植酸上的吸附率在75%~90%范围内;试验条件下温度为15℃时腐植酸对毒死蜱的吸附量最大,随着试验温度的升高吸附量呈现出先降低后增大的趋势;pH和离子强度变化对毒死蜱的吸附影响均不明显;腐植酸添加量越大,单位质量的腐植酸吸附量越小。

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