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mobilization of arsenic from contaminated sediment by anionic and nonionic surfactants

Journal of Environmental Sciences 2017年第6期29卷 281-289页

作者： Chuan Liang Xianjia Peng Beijing Key Laboratory of Industrial Wastewater Treatment and Reuse Research Center for Eco-Environmental SciencesChinese Academy of SciencesBelting 100085China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The increasing manufacture of surfactants and their wide application in industry, agriculture and household detergents have resulted in large amounts of surfactant residuals being discharged into water and distributed into sediment. surfactants have the potential to enhance arsenic mobility, leading to risks to the environment and even human beings. In this study, batch and column experiments were conducted to investigate arsenic mobilization from contaminated sediment by the commercial anionic surfactants sodium dodecylbenzenesulfonate （SDBS）, sodium dodecyi sulfate （SDS）, sodium laureth sulfate （AES） and nonionic surfactants phenyl-polyethylene glycol （Triton X-100） and polyethylene glycol sorbitan monooleate （Tween-80）. The ability of surfactants to mobilize arsenic followed the order AES 〉 SDBS 〉 SDS = Triton X-100 〉 Tween 80. arsenic mobilization by AES and Triton X-100 increased greatly with the increase of surfactant concentration and pH, while arsenic release by SDBS, SDS and Tween-80 slightly increased. The divalent ion Ca2＋ caused greater reduction of arsenic mobilization than Na＋. Sequential extraction experiments showed that the main fraction of arsenic mobilized was the specifically adsorbed fraction. Solid phase extraction showed that arsenate （As（V）） was the main species mobilized by surfactants, accounting for 65.05%-77.68% of the total mobilized arsenic. The mobilization of arsenic was positively correlated with the mobilization of iron species. The main fraction of mobilized arsenic was the dissolved fraction, accounting for 70% of total mobilized arsenic.

关键词： surfactants arsenic iron sediment mobilization

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