土壤类型与污染浓度对漆酶修复DDT污染土壤的影响

Effect of soil types and pollution levels on remediation of DDT soil pollution by laccase

具有难降解、高残留特征的DDT至今在土壤中仍有残留,对农产品安全和人体健康有严重影响。本文采用批实验的方法研究了3种不同类型土壤和3个污染水平对漆酶修复DDT污染土壤的影响。研究结果表明,不同类型土壤中DDT各组分及总量(DDTs)的降解率存在显著差异,总体上为水稻土>菜园土>赤红壤,对照处理土壤中DDTs的降解率仅为20%左右,加酶处理土壤中则高达50%～65%。对于不同污染水平的DDT污染土壤,土壤中DDT各组分及DDTs的降解率均随着污染水平的提高而增大,多数在不同污染水平之间差异显著。对照处理对不同污染水平土壤中DDTs的降解率仅为15%左右,而加酶处理则高达43.60%～50.53%。

The pesticide DDT （Dichlorophenyltrichloroethane） is a toxic and persistent organic pollutant in soil. Although it has been banned in China since 1983, there are also residues of DDT in soil, which could bring influence on agricultural products quality and human health, Batch experiments were made to investigate the effect of three soils and three pollution levels on the remediation of DDT by laccase respectively. Main results achieved from this study are as follows＇, Degradation rates of indivldual and total DDT in three soils are different significantly and generally in order of paddy soil〉vegetable soil〉lateritic red soil, Degradation rates of DDTs are only 20% or also in control soils but up to 50% - 65% in laccase-treated soils, As for the contaminated soils with different pollution levels, degradation rates of individual and total DDT in lateritic red soil with different pollution concentrations increase with increasing pollution levels and most of them are different significantly among different levels. Degradation rates of DDTs are only 15% or also in control soil with different pollution levels but up to 43.60% - 50.53 % in laccase-treated soil with corresponding pollution levels.