液膜分离富集CN-与测定水中氰化物

SEPARATION AND ENRICHMENT OF CN - WITH EMULSION LIQUID MEMBRANE AND DETERMINATION OF CYANIDE IN WATER

用ＴＢＰ－ＰＭＢＰ、ＳＰＡＮ８０、液体石蜡、煤油和内相（２％ＮａＯＨ溶液）乳状液膜，研究了ＣＮ－的迁移行为及最适宜的实验条件。ＣＮ－在１５ｍｉｎ内可以迁移９９．５％以上。在此情况下许多共存离子，如Ｍｏ６＋、Ｍｏ５＋、Ｆｅ３＋、Ａｌ３＋、Ｃａ２＋、Ｍｇ２＋、Ｓｒ２＋、Ｂａ２＋、∑ＲＥ３＋、Ａｇ２＋、Ｐｄ２＋、Ｐｔ４＋、Ｒｈ３＋、Ｃｕ２＋、Ｐｂ２＋、Ｚｎ２＋、Ｗ６＋、Ｖ５＋、Ｓｎ４＋、Ｓｅ４＋、Ｔｅ４＋、ＳｉＯ２－３、ＮＯ－３、Ｃｌ－、ＳＯ２－４、ＰＯ３＋４、ＣｌＯ－４、ＣＯ２－３、Ｓ２－、Ｉ－、ＮＨ＋４、胺、乙酸根等，都不能被迁移透过这一乳状液膜，使ＣＮ－（或氰化物）与这些离子得到满意的分离。此法已成功地用于富集、测定水和工业废水中的微量氰化物，相对标准偏差（ＲＳＤ）在３．８％以下。

The transport of CN - through the emulsion liquid membrane of TBP-PMBP-SPAN80-liquid paraffin-kerosene-internal phase(2%NaOH solutions)that transporting CN -(cyanide)completely and rapidly was carried out under optimal experimental conditions.The transport rate in 15 min is above 99.5%.In this case many Co-existed ions,such as Mo 6+ ,Mo 5+ ,Fe 3+ ,Al 3+ ,Ca 2+ ,Mg 2+ ,Sr 2+ ,Ba 2+ ,∑RE 3+ ,Ag 2+ ,Pd 2+ ,Pt 4+ ,Rh 3+ ,Cu 2+ ,Pb 2+ ,Zn 2+ ,W 6+ ,V 5+ ,Sn 4+ ,Se 4+ ,Te 4+ ,SiO 2- 3,NO - 3,Cl -,SO 2- 4,PO 3+ 4,ClO - 4,CO 2- 3,S 2- ,I -,NH + 4,amines,Ac - etc.can be separated from these ion satisfactorily.The method has been successfully applied to the enrichment and determination of trace cyanide in water and industrial waste water with a relative standard deviation(RSD)of less than 3.8%.