摘要
研究了碱性介质中，Ｍｎ（Ⅱ）被空气氧化生成Ｈ２ＭｎＯ３，然后在Ｈ３ＰＯ４介质中，Ｃｕ（Ⅱ）和阳离子型有机相／水相微乳液（ＣＴＭＡＢ／戊醇／正庚烷／水）的存在下，Ｍｎ（Ⅳ）与二安替比林对乙氧基苯基甲烷（ＤＡｐＥＭ）生成橙色产物，λｍａｘ为４５０ｎｍ，ε＝１．９５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｍｎ（Ⅱ）的质量浓度在０～３２０μｇ／Ｌ内符合比尔定律。方法用于合金中锰的测定，结果与标准值符合，５次测定结果的ＲＳＤ＜３％。
In alkaline medium, Mn(Ⅱ) was oxidized to Mn(Ⅳ) by air. In the presence of Cu(Ⅱ) and CTMAB/ n C 5H 11 OH/ n C 7H 16 /H 2O, diantipyryl ( p ethoxy )phenylmethane reacts with Mn(Ⅳ) to form a orange product in phosphoric acid medium. The molar absorptivity is 1.95×10 5 L·mol -1 ·cm -1 at 450 nm. Beer′s law is obeyed in the range of 0～320 μg/L. The method has been applied to the determination of manganese in alloy. The results are in good agreement with recommended values with precision of <3% RSD( n =5).
出处
《岩矿测试》
CAS
CSCD
北大核心
1998年第4期282-284,共3页
Rock and Mineral Analysis
基金
云南省教委自然科学基金
关键词
锰
混合表面活性剂
显色反应
显色剂
diantipyryl ( p ethoxy ) phenylmethane, spectrophotometry, manganese, cetyltrimethylammonium bromide(CTMAB), n pentanol( n C 5H 11 OH), n heptane( n C 7H 16 )
