Cd对不同形态漆酶修复DDT污染土壤的影响

Effect of Cd on Remediation of DDT Contaminated Soil Using Different Laccase Forms

研究了重金属Cd对游离漆酶和固定化反胶团漆酶修复土壤有机氯农药DDT污染的影响.结果表明,游离漆酶对土壤中DDT各组分均有不同程度降解,且均随着Cd浓度的增大而降低,含量越高的组分降解率越高,受到Cd污染的影响也越大(p,p-′DDT>p,p-′DDD>o,p-′DDT>p,p-′DDE);当Cd浓度分别为0、0.5、1和2 mg.kg-1时,游离漆酶对土壤中DDT总量的降解率分别为50.68%、32.50%、14.92%和13.40%.固定化反胶团漆酶比游离漆酶能更有效地降解DDT,DDT降解率在无Cd和有Cd存在时(Cd浓度为0.5 mg.kg-1)分别提高20%和30%左右.

This study investigated the effect of Cd on remediation of DDT contaminated soil using free laccase and immobilized reversed micelles laccase.The results show： degradation rates of ingredients of DDT and total DDT reduced with increasing of Cd concentration,the higher percentage of components in total DDT,the greater impact of Cd on them.Degradation rates of different components were p,p′-DDT 〉 p,p′-DDD 〉o,p′-DDT〉p,p′-DDE.When Cd concentration was 0,0.5,1 and 2mg·kg^-1,the responding degradation rates of DDTs were measured at 50.68%,32.50%,14.92% and 13.40%,respectively.Compared with free laccase,degradation rate of total DDT by immobilized reversed micelles laccase nearly increased by 20% in soil without Cd and 30% in soil with 0.5mg·kg^-1 Cd,implying that immobilized reversed micelles laccase is more effective for DDT degradation than free laccase.