Triadimefon在土壤中的降解和吸附

对Triad im efon在土壤中的降解和吸附行为进行了研究。两年的大田试验结果表明Triad im efon在红壤中半衰期分别为3.68d和8.77d,水稻土中分别为3.69d和7.63d,其降解受温度影响较大。批量法研究的Triad im efon在四种土壤中的吸附行为的试验结果表明Triad im efon在土壤中的吸附符合Freund lich经验公式;Kd随土壤有机质含量的增加而增大,吸附性与土壤有机质含量呈正相关;土壤有机质吸附常数Koc为259,表明Triad im efon在土壤中的移动性为中等:在土壤中的吸附量随温度的升高而降低,在土壤中的吸附主要为物理吸附。

Degradation and Adsorption Behaviors of Triadimefon in Soil

The degradation and adsorption behaviors of triadimefon in soil were investigated.The field experiments of two years showed that the half-lives of triadimefon in red soil were 3.68 and 8.77d,repectively.Howerer,those of triadimefon in paddy soil were 3.69d and 7.63d respectively.Triadimefon in soils was influenced by temperature.In addition,the results of adsorption behavior of triadimefon in four soils with the batch equilibrium method indicated that adsorption isotherms of triadimefon was described very well by the Freundlich equation.The Kd value increased with the increasing quantity of soil organic matter.The average adsorption constant of soil organic matter(Koc) was 259,which meant that the ability of triadimefon's movement in soil belonged to medium one.The quantity of soil adsorption decreased with the temperature increasing.The adsorption of triadimefon in soil was mainly physical adsorption.