氯菊酯在不同质地土壤中的光降解动力学规律

为了研究氯菊酯在土壤中的光降解规律,更好地为其在自然环境中的降解提供理论依据,探讨了氯菊酯在不同质地土壤中,不同条件下的光降解动力学规律。结果表明:氯菊酯降解符合准一级动力学规律,氯菊酯的降解受土壤质地的影响较大,在不同土壤中降解率为:壤质砂土砂质壤土壤质黏土,日光比紫外光照射下腐殖酸对氯菊酯的降解影响明显,随着腐殖酸浓度的增加,它对氯菊酯的降解作用先促进后抑制。

Photodegradation Kinetics of Permethrin in Different Soil Texture

In order to study the fate of permethrin photodegradation in the soil and to provide better theoretical basis for degradation of permethrin in natural environment, degradation kinetics of permethrin photodegradation was investigated in the different soil mechanical compositions and under different conditions. Results show that all photodegradation reactions followed Pseudo-first-order kinetics, and permethrin degradation was greatly influenced by soil texture. Degradation rate of permethrin under tested conditions followed the order of loamy sand > sandy loam > loamy clay. It is greater under sunlight than under UV light that humic acid affects photo degradation of permethrin. Humic acid plays a promoter role on degradation at first and with the increasing of its concentration it plays an inhibit role.