This article selected seven surfactants,paired in combinations,as washing agents to investigate their effects on leaching chromium(Ⅵ)from soil and the influencing factors.The results showed that the novel amphoteric surfactant,octadecyl dimethylammonium oxide(OA-18),had a higher leaching rate compared to the other six surfactants.Additionally,the mixed washing agent composed of OA-18 and sodi-um dodecyl benzene sulfonate(SDBS)demonstrated better leaching performance than individual surfac-tants and other tested combination washing agents.The best leaching effect was achieved when OA-18 and SDBS were combined in a volume ratio of 6∶4,with an initial concentration of the mixed washing agent at 1.2 g/L,a solution pH of 8,an oscillating washing time of 12 h,and a soil-to-water ratio of 1∶15.Under these conditions,the removal rate of chromium(Ⅵ)from soil was 92.3%.
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