DBH-PF—Tar—CPB体系分光光度法测定钽

Spectrophotometric Determination of Tantalum with 3,5-Dibromo-4-Hydroxy Phenyl Fluorone(DBH-PF)-Tartaric Acid(Tar)-Cetylpyridinium Bromide(CPB)System

研究了用新显色剂DBH-PF分光光度测定钼的方法。在CTMAB存在时,Ta与DBH-PF形成1∶3红色配合物,最大吸收在523nm波长处,摩尔吸光系数为1.2×10~5,当钽含量在0～30μg/25ml范围内符合比尔定律。许多其它金属离子不干扰钽的测定。方法灵敏,选择性高,应用于高温合金中钽的测定获得满意的结果。

A spectrophotometric method for the determination of tantalum with the new chromogenic reagent DBH-PF has been studied.In the presence of CTMAB, Ta reacts with DBH-PF to form a 1:3 red complex with a maximum absorption at 523 nm, its molar absorptivity being 1.2X105. Beerfs law is obeyed for 0-30ug Ta/25ml. Most of other metal ions do not interfere with the determination of tantalum.The present method is sensitive and selective ,and satisfactory results are obtained in the determination of tantalum in high-temperature alloys.