摘要
研究了3种表面活性剂及其不同浓度配比对五种柴油链烃的增溶及对柴油污染土壤的洗脱作用。结果表明,复合表面活性剂的增溶效果优于单一表面活性剂,其中尤以阴离子表面活性剂SDS与非离子表面活性剂Tw-80的配比效果最佳;随阴离子表面活性剂复合比例的提高,可以有效地降低复合表面活性剂混合胶束的临界胶束浓度,提高单位表面活性剂接纳目标污染物的能力,增大目标链烃分配进入胶束相的倾向,同时有效降低增溶平衡时对表面活性剂用量的要求;高浓度的阴离子表面活性剂具有很高的污染洗脱效率,非离子表面活性剂Tw-80则易被土壤吸附而导致洗脱效率低下,但阴离子表面活性剂SDS与Tw-80配比能够有效地改善Tw-80易被土壤吸附的现象,并随复合比例提高而不同程度的增强污染土壤中柴油的洗脱效果。
The mobilization and elution of the five diesel hydrocarbons from contaminated soil has been examined using three kinds of commercially available surfactants and their combinations. The elution of diesel hydrocarbons by the combined surfactants was increased by the combined surfactants, especially for the combination of anion surfactant SDS and nonionic surfactant Tw-80. The mobilization of the diesel hydrocarbons increased and the critical micelle concentration （CMC） of combined surfactants declined with the increasing of proportion of anionic surfactant in the combination. The mobilization efficiency of Tw-80 on the diesel hydrocarbons was low because of its adsorption on soil. However the addition of SDS would improved this phenomenon, and the mobilization and elution efficiency of diesel hydrocarbons was increased with its proportion rising.
出处
《生态环境学报》
CSCD
北大核心
2009年第2期523-530,共8页
Ecology and Environmental Sciences
基金
国家水专项(2008ZX07101-010)
国家自然科学基金项目(20507017)
关键词
表面活性剂
复合
增溶
洗脱
柴油
surfactants
diesel
solubilization
washing
compound
