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[方法]采用平衡吸附法,对黑土吸附百菌清及解吸行为进行研究,了解百菌清在土壤环境中的存在状况及迁移规律。[结果]土壤对百菌清的吸附和解吸经历了快速、减速和平衡3个阶段,土壤对百菌清吸附解吸平衡基本在12 h内完成。黑土对百菌清的吸附符合Henry等温式,在试验质量浓度范围内黑土对百菌清的最大吸附量为1 386.75 mg/kg,最大解吸率为7.93%;pH值对黑土吸附百菌清的影响呈现出正相关性,随pH值增加百菌清吸附量增大,而对百菌清解吸的影响呈现负相关性,随pH值增加百菌清的解吸量减小。[结论]研究表明:土壤pH值对百菌清在土壤中的环境行为具有一定的影响;土壤对百菌清的吸附量与解吸率的相差较大。
[Method] The equilibrium adsorption method was used to study the adsorption of chlorothalonil and desorption of black soil to understand the existence and migration of chlorothalonil in the soil environment. [Result] The adsorption and desorption of chlorothalonil under the soil had three stages of rapid, slowed down and equilibrium. The equilibrium of adsorption and desorption of chlorothalonil under the soil was basically completed in 12 h. The adsorption of chlorothalonil on black soil accorded with Henry’s isotherm. The maximum adsorption capacity of chlorothalonil on black soil was 1 386.75 mg / kg and the maximum desorption rate was 7.93% within the test concentration range. The adsorption of chlorothalonil The effect showed a positive correlation. With the increase of pH value, the adsorption capacity of chlorothalonil increased, but the effect on the desorption of chlorothalonil showed a negative correlation. The desorption amount of chlorothalonil decreased with the increase of pH value. [Conclusion] The results showed that: the pH of soil had a certain impact on the environmental behavior of chlorothalonil in soil; the difference of adsorption and desorption rate of chlorothalonil in soil was larger.