3种表面活性剂对有机氯农药污染场地土壤的增效洗脱修复效应

以有机氯农药生产企业工业场地污染土壤为对象,研究Tween80、TritonX-100和SDS这3种表面活性剂对土壤中氯丹(α-氯丹和γ-氯丹)、灭蚁灵、七氯、硫丹(α-硫丹和β-硫丹)的增溶洗脱效应.结果表明,3种表面活性剂对土壤中的有机氯农药均具有一定的增效洗脱作用,且洗脱去除率随表面活性剂添加量升高而逐渐增加.3种表面活性剂对土壤中氯丹、硫丹和七氯的去除率明显高于灭蚁灵,TritonX-100对灭蚁灵的去除率明显高于SDS和Tween80.Tween80和TritonX-100添加量为10g·L-1、SDS添加量为8.50g·L-1时,对土壤中4类有机氯农药的总去除率最高,分别为32.8％、59.7％和60.1％.对于该类污染场地土壤,选择10g·L-1 TritonX-100溶液在50℃条件下振荡5min时洗脱效果最好.

Effects of Three Surfactants Remedying Organochlorine Polluted Soils Through Enhanced Elution

A batch soil washing experiment was carried out using Tween80,TritonX-100 and SDS,three different kinds of surfactants to elute organochlorine pesticides from contaminated soil.It was found that Tween80,TritonX-100 and SDS all displayed certain effects,which increased with the application rate of the surfactants.Their effects on chlordane,endosulfan and heptachlor were obviously higher than on mirex.The removal effect of TrintonX-100 on mirex was significantly higher than that of the other two.Treated with Tween80 at 10 g·L-1,Triton X-100 at 10 g·L-1 and SDS at 8.50 g·L-1,the soil reduced its total contamination of the four pesticides by 32.8%,59.7% and 60.1%,respectively with elevated temperature,the removal rate of OCPs increased.For such contaminated soils,the use of 10 g·L-1 TritonX-100 was the best after the samples were shaken for 5 minutes at 50 ℃.