3种低相对分子质量有机酸对土壤中DDT的解吸

Effect of Three Low-Molecular Organic Acids on Desorption of DDT in Soil

选择不同质量浓度（3.4～2000 mg/L）的有机酸做土壤中的滴滴涕（DDT）解吸实验.结果表明：在质量浓度为3.4 mg/L时柠檬酸和苹果酸对土壤中DDT的解析率达到4.6%和3.5%,并且盐碱土中DDT的解析率要高于草甸土中的解析率.植物生长过程中根系会释放根系分泌物,这些根系分泌物会增加对土壤中有机污染物的净化,这是一种有长远利用价值的土壤净化方式.

The different mass concentrations of organic acids were chosen to investigate the desorption of DDT in soil. Citric acid and malic acid both markedly enhanced the desorption of DDT when their mass concentrations were 3.4 mg/L,their desorption rates can reach 4.6% and 3.5% ,and the desorption rate of DDT in saline soil was higher than that in nesdow soil. The root can release exudates in the course of plant growth, these exudates can increase the purification of organic pollutants in soil, which was one kind of soil decontamination methods with long-term value.