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我国对微量铟的显色反应研究得较少.最常用的是碱性染料萃取光度法,但操作冗繁而且苯的毒性较大.因此寻找灵敏度高而又能在水相测定铟的新方法是很有必要的. 用苯荧光酮(2,3,7-三羟基-9-苯基-6-荧光酮,PF)作显色剂的胶束增溶分光光度法已应用于锗、钼、锡、镓等的测定,但用类似的方法测铟则尚未见报道.我们的实验证明,在pH为7.7～8.9的醋酸-氢氧化铵缓冲介质中,铟与PF及氯化十六烷基吡啶(OPC)生成玫瑰红色的三元配合物,其配合比为In(III):PF:CPC=1:2:2,表观稳定常数为8.6×10~(10),摩尔吸收系数达1.28×10~5.提出用乙酸乙酯萃取分离杂质.利用本显色反应测定微量铟,方法灵敏且稳定,准确度和精密度均较好.
However, there are few studies on the color reaction of trace indium in our country, and the most common one is the basic dye extraction spectrophotometry, but the operation is cumbersome and the benzene is more toxic.Therefore, finding a new method of high sensitivity and determination of indium in aqueous phase is It is necessary that micellar solubilization spectrophotometry using benzene fluorone (2,3,7-trihydroxy-9-phenyl-6-fluorone, PF) as a developer has been applied to germanium, molybdenum, Tin, gallium, etc. However, it has not been reported that a similar method of measuring indium has been reported.Our experiments show that indium and PF and cetyl chloride Pyridine (OPC) is a rose-red ternary complex with an In (III): PF: CPC ratio of 1: 2: 2, an apparent stability constant of 8.6 × 10 ~ (10) and a molar absorption coefficient of 1.28 × 10 ~ 5. Proposed extraction of impurities with ethyl acetate.Using the color reaction of trace indium, the method is sensitive and stable, accuracy and precision are better.