Abstract: Emulsion liquid membrane system containing mobile carrier is widely applied in separation and preconcentration of trace substances in solution. In this paper，the separation performance for fluoride was studied by the emulsion liquid membrane. Established stable conditions of the emulsion liquid membrane were as follows：the volume ratio of T-154 to liquid paraffin to kerosene was 3∶2∶95，the mass concentration of Al2(SO4)3 used as the internal phase was 3%，and the ratio of oil phase to internal phase was 1∶0.6. The separation conditions including the ratio of emulsion to external phase，the value of pH，stirring speed and enrichment time were investigated. The fluoride in the environmental water was determined with the prepared emulsion. The results showed that the recovery of standard addition was 96%—103%，the relative standard deviation was 2.0%—4.8%. The method of separation and preconcentration of fluoride had the advantages of simple operation，low-cost and high efficiency.

Key words: emulsions, liquid membranes, separation, fluoride, surfactants, waste water

摘要： 乳状液膜在分离富集溶液中的微量物质方面获得广泛的应用，本文研究了其对溶液中氟离子的分离富集效果，确定了制备稳定乳状液膜的条件：乳化剂（T-154）∶膜增强剂（液体石蜡）∶溶剂（煤油）=3∶2∶95（体积比），内水相为3%的Al2(SO4)3溶液，油内比为1∶0.6；讨论了分离富集条件，包括乳水比、溶液pH值、搅拌速度和富集时间等因素；应用于环境水样中氟离子的测定，加标回收率为96%～103%，相对标准偏差RSD（n=6）为2.0%～4.8%，结果令人满意。指出该方法操作简单、成本低、效率高，可用于分离富集废水中的氟离子。

关键词: 乳液, 液膜, 分离, 氟, 表面活性剂, 废水