求救 翻译摘要

来源：百度知道 编辑：UC知道 时间：2024/09/22 01:56:46
DDT在土壤中的长期残留及其在生物链中的传递，破坏农业生态平衡，危害人体健康，影响部分农产品的对外贸易，所以研究DDT污染土壤的治理方法有着重要意义。本文研究了不同气氛（空气、氧气、氮气）对多孔菌分泌的漆酶修复土壤DDT污染的影响。采用紫外可见分光光度计、气相色谱法（GC）等分别对漆酶的酶活和土壤中DDT的浓度变化进行检测。
实验结果表明：漆酶粗液经过硫酸盐析，酶活力提高50％；DDT污染土壤的漆酶处理中，都是在DDT总量中所占比例较大的组分O,P’-DDT， P,P’-DDD 和P,P’-DDT的浓度降低得较快，降解率较高；所占比例较小的P,P’-DDE的浓度降低很慢，降解率较低；DDT中各组分及DDT总量在酶处理中的降解率随污染土壤中DDT初始浓度的降低而降低。DDT在氧气气氛下降解率为69.63％，在氮气气氛下的降解率为41.22％，在空气气氛下的降解率为62.60％，说明漆酶在氧气充足的条件下，活性更高，对土壤的酶修复效果显著。DDT初始浓度为4.87mg/kg的土壤经过25天的酶处理后，浓度降低到1.5mg/kg，DDT总量的降解率为66.84％。
关键词 DDT 土壤污染 多孔菌 漆酶 固定化酶 修复

DDT in the soil and in the long-term residual biological chain of transmission, destruction of agricultural ecological balance and endanger human health, the impact of some of the foreign trade of agricultural products, the DDT-contaminated soil on the method of governance is of great significance. In this paper, a different atmosphere (air, oxygen, nitrogen) of the porous secretion of laccase repair soil DDT pollution. Using UV-visible spectrophotometer, gas chromatography (GC), respectively on the laccase activity and the concentration of DDT in the soil to detect changes.
The results showed that: laccase after Kraft out of rough, activity increased 50%; DDT-contaminated soil in the handling of paint, are in total DDT in the larger proportion of the components O, P'-DDT, P, P'-DDD and P, P'-DDT to reduce the concentration of a faster, higher rates of degradation; smaller proportion of the P, P'-DDE reduce the concentration of very slow, low rate of degradatio