摘要
在ｐＨ３．５～４．５的邻苯二甲酸氢钾－ＨＣｌ缓冲介质中，Ｓｂ（Ⅲ）与甲基橙、溴化十六烷基三甲铵形成有色多元配合物的显色反应，建立了测定微量锑的高灵敏光度分析法。配合物最大吸收波长为５４０ｎｍ，表观摩尔吸光系数为４．８９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，锑的质量浓度在０～１２μｇ／２５ｍＬ范围内符合比尔定律，配合物中Ｓｂ（Ⅲ）与甲基橙（ＭＯ）的组成比为ｎ（Ｓｂ（Ⅲ））∶ｎ（ＭＯ）＝１∶１。采用巯基棉分离，可消除共存离子的影响，提高体系的选择性。已用于铜合金中微量锑的测定，结果满意。
A highly sensitive spectrophotometric method for the determination of trace antimony has been developed ,based on the reaction of antimony(Ⅲ) with methyl orange(MO) and cetyltrimethylammonium bromide (CTMAB).In the KHC 8H 4O 4 HCl buffer medium at pH3.5～4 5,antimony reacts with methyl orange and CTMAB to form a red complex which exhibits maximum absorption at 540nm with an apparent molar absorptivity of 4.89×10 5L·mol -1 ·cm -1 .The composition of the complex is n (Sb(Ⅲ))∶ n (MO)=1∶1.Beer's law is obeyed in the range of 0～12μg/25mL for antimony.After separation of the interfering ions by sulfhydryl fiber cotton,the method has been applied to the determination of trace antimony in copper alloys with satisfacotry results.
出处
《分析试验室》
CAS
CSCD
1999年第1期5-8,共4页
Chinese Journal of Analysis Laboratory
关键词
锑
甲基橙
分光光度法
CTMAB
测定
Antimony
methyl orange
cetyltrimethylammonium bromide
spectrophotometry
