摘要
基于铋对抗坏血酸还原磷钼酸反应的催化作用，提出了测定微量铋的动力学极谱法。催化反应产物在ｐＨ９．６的ＮＬＨ＿３—ＮＨ＿４Ｃｌ缓冲溶液中于－１．２０Ｖ（ｖｓ．ＳＣＥ）可产生一个灵敏的极谱波。催化体系与非催化体系的△ｉ与铋浓度在０～１．０μｇ／ｍＬ范围内有线性关系。拟定了利用氯氧化铋沉淀法分离，示波极谱测定合金标样中微量铋的方法。
in acidic medium, bismuth can catalyze the reaction of ascorbic acid and molybdophosphoric acid. The reaction product can be reduced with a sensitive wave at-1.20V (vs. SCE) in NH3-NH4Cl buffer solution (pH 9.6). The working curve is linear from O to 10 μg/10 mL bismuth. The polarographic behavior of the catalyzed product has been studied, the wave is proved to be an adsorbtive wave. The method has been used to determinate bismuth in standard samples of alloy by separating bismuth from diverse ions as the oxychloride. Satisfactory results are obtained.
出处
《桂林工学院学报》
1996年第2期174-177,共4页
Journal of Guilin University of Technology
关键词
铋
磷钼酸
维生素C
极谱法
bismuth
molybdophosphate heteropoly acid
ascorbic acid
polarography
