液膜法分离富集、测定水中微量锶

Separation Enrichment and Determination of Trace Strontium in Water by Means of Liquid Membranes

用乳状液膜体系对锶进行分离富集。该体系包括协同流动载体（ＰＭＢＰ、ＴＢＰ）、表面活性剂（ＳＰＡＮ８０）、增强剂（丙三醇）、溶剂（正已烷）和内相（１．２ｍｏｌ／Ｌ的盐酸溶液）。实验表明，在适宜的条件下，锶的富集效率可达９９．５％以上，而在此条件下许多共存离子，如Ｆｅ３＋，Ａｌ３＋，Ｃａ２＋，Ｍｇ２＋，Ｂａ２＋，Ｃｒ３＋，Ｃｏ２＋，Ｎｉ２＋，Ｚｒ４＋，Ｃｕ２＋，Ｚｎ２＋，Ｐｂ２＋和ΣＲＥ３＋等（均含２５ｍｇ）；Ｍｎ２＋，Ｈｇ２＋（５ｍｇ）；ＮＯ－３，Ｆ－，Ｃｌ－，ＣｌＯ－４，ＳＯ２－４，Ｉ－，Ｂｒ－（５０ｍｇ，均为非最大限量）；都不迁移、透过此乳状液膜。该法已成功地用于分离富集、测定水和工业废水中的微量锶，相对标准偏差在３．２％以下。

An emulsified liquid membrane system has been used for the separation and enrichment of strontium The system includes a synergetic mobile carrier(PMBP and TBP), a surfactant(SPAN80), a strengthen reagent(glycerol), a solvent(n-Hexane) and an internal phase(1 2 mol/L HCl solution) Experimental results show that the enrichment efficiency can be over 99 5% under appropriate conditions In this case, many co-ions, such as Fe 3+ , Al 3+ , Ca 2+ , Mg 2+ , Ba 2+ , Cr 3+ , Co 2+ , Ni 2+ , Zr 4+ , Cu 2+ , Zn 2+ , Pb 2+ , ∑RE 3+ , etc can not pass through the emulsified liquid membrane The method has been successfully applied to the enrichment and determination of Sr in water and industrial waste water with a relative standard deviation of less than 3 2%