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高纯铟中锡的测定,一般用硫酸溶样,用铜铁试剂三氯甲烷萃取分离,然后采用比色法、极谱法或光谱法进行测定。这些方法手续烦琐,分析时间长,空白值高,结果稳定性差。我们曾经试验不预先分离锡,以苯芴酮甲基异丁酮萃取进行比色测定,此法条件不易掌握。现提出一个不预先分离锡的苯芴酮比色法。此法加入阳离子表面活性剂—溴化十六烷基三甲基胺以提高灵敏度,加入草酸加快显色速度。
High-purity indium tin determination, the general use of sulfuric acid samples, with copper and iron reagent chloroform extraction and separation, and then using colorimetric, polarographic or spectroscopic determination. These procedures are cumbersome procedures, analysis of a long time, the blank value is high, the results of poor stability. We have tried not to pre-separation of tin, with benzofluorenone methyl isobutyl ketone extraction colorimetric determination, this method is not easy to grasp the conditions. A benzofluorenone colorimetric method is proposed without pre-separation of tin. This method to join the cationic surfactant - cetyl trimethyl ammonium bromide to improve the sensitivity, adding oxalic acid to speed up the color development.