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研究了三溴偶氮胂 (TBA)与铋的显色反应。结果表明 ,在 0 88mol/LHClO4介质中 ,Bi 与TBA形成 1∶2稳定的紫红色络合物 ,其最大吸收波长为 630nm ,表观摩尔吸光系数ε=8 78× 1 0 4 ,铋量在 0～50 μg/2 5mL范围内符合比尔定律。本法用于人发中微量铋的测定 ,结果满意。
The color reaction of tribromoarsenazo (TBA) with bismuth was studied. The results showed that Bi and TBA formed a 1: 2 stable fuchsine complex in 0 88mol / LHClO4 medium with a maximum absorption wavelength of 630nm and an apparent molar absorptivity of ε = 8 78 × 10 4. Beer’s law is obeyed in the range of 0 ~ 50 μg / 2 5mL. This method is used for the determination of trace bismuth in human hair with satisfactory results.