DDT污染土壤的植物修复技术

The phytoremediation technique of DDT-contaminated soil

本文报道用植草方法研究为DDT及其主要降解产物污染土壤的植物修复技术。在污染物的浓度为 0 .2 15mg/kg的土壤中 ,种植 10种草 3个月后DDT及其主要降解产物的总含量分别降低 19.6 %— 73.0 %。种植不同品种的草对土壤中污染物有不同的去除能力 ,其中以种植丹麦产的Taya草 (Per .ryegrass)与美国产的Titan草 (Tallfescue)为最强。用种植草的方法修复受DDT及其主要降解产物污染的土壤是一项可行的技术。在去除土壤中DDT的作用上 ,草的吸收是轻微的 ,只占原施药量的 0 .13%— 1.0 8% ,土壤中污染物消失的主要因素是土壤中生物降解作用的结果。

A phytoremediation technique for contaminated soil by DDT and its main degradation product using 10 species of grass was described. The concentration of DDT and its main degradation product with concentration of 0.215 mg/kg in soil was decreased from 19.6% to 73.0%, respectively after the growth of grass in 3 months. Various species of grass had different remediation ability. The Taya grass from Danish and Titan grass from USA possessed stronger ability among the 10 species of grass. Utilization of grass for remediation of DDT and its main degradation product contaminated soils was a possible technique. In the decrease of DDT and its main degradation product in soil, the function of absorb and concentration of DDT and its main degradation product by grass was very low, and was only 0.13%-1.08% of original amount of pesticide in soil. The key factor was microdegradation of pesticides in soil.