【摘要】 在硫酸介质中 ,以酒石酸为活化剂 ,痕量钒对溴酸钾氧化甲基橙的反应有极强的催化作用 ,以极谱法监测催化反应过程中甲基橙及其氧化产物浓度的变化 ,建立了双峰指示催化动力学极谱法测定痕量钒的新方法。方法的线性范围为 0 .2 3～ 3.70 μg/L,检出限为 0 .1 7μg/L。方法已用于食品及水样中痕量钒的测定。更多还原

【Abstract】 A new catalytic polarographic method for determination of trace amounts of vanadium(Ⅴ) was proposed .The method was based on the catalytic effects of V(Ⅴ) on the oxidation of methy1 orange by bromate in sulfuric acid medium with tartaric acid as an activator. The reaction was monitored by measuring the decrease of the peak height at -0 62V or the increase of the peak height at -0.52V. The linear range is 0.23～3.70 μg/L for vanadium(Ⅴ), with detection limit of 0.17 μg/L. The method was used to determine trace vanadium in food and water samples with satisfactory results.更多还原