【摘要】 本文研究了在氯乙酸介质中,锡（Ⅳ）-溴邻苯三酚红-Tween 80-溴化十六烷基吡啶体系的高灵敏配合显色反应。反应的适宜酸度为2.62—2.94。配合物的最大吸收在530nm。摩尔吸光系数为3.72×10⁵L·mol^-1·cm^-1。锡（Ⅳ）含量在0.2—5.0μg/25ml范围内服从比耳定律。研究了30余种离子的干扰。拟定的方法可用于Pb（N0₃）₂中微量锡的测定。更多还原

【Abstract】 In a medium of monochloroacetic acid, a highly sensitive colour reaction of Sn（Ⅳ） with bromopyrogallol red （BPR）, Tween-80 and cetylpyridinium bromide （CPB） has been studied spectrophotometrically. Sn（Ⅳ） forms a red-purple complex with the above reagents at pH 2.62—2.94 exhibiting maximum absorption at 530 rim. Beer’s law is obeyed for Sn（Ⅳ） in the range of 0.2—5.0μg in 25 ml with the molar absorptivity of 3.72×10⁵ L.mol-1. cm^-1. The effects of diverse ions on the determination of Sn（Ⅳ） are examined, Micro amounts of Sn in pure Pb（NO₂）2 have been dctermined.更多还原