催化动力学示波电位法测定蔬菜中痕量钒

Catalytic-Kinetic Determination with Oscillographic Potentiometry of Trace Vanadium in Vegetables

研究了在酸性介质中 ,钒催化KBrO3 KBr 抗坏血酸体系的反应和动力学条件 ,建立了催化动力学示波电位法测定痕量钒的方法。该方法的检出限为 0 .0 1 1 5μg·ml- 1 ,线性范围为 0～ 0 .1 0 3μg·ml- 1 ,反应的活化能为 1 5 .30kJ·mol- 1 。该法加料测定回收率为 96 %～ 1 0 1 % ,操作简便、快捷 ,准确度高。用于蔬菜中钒的含量测定 ,结果令人满意。

A catalytic-kinetic method combined with oscillographic potentiometry was developed for determination of trace vanadium based on shortening the induction period of bromate with bromide and ascorbic acid in chlorhydic acid system. The method has high sensitivity for the determination of trace vanadium. The linear range of determination is 0～0.103 μg·ml -1. The determination limit is 0.0115 μg·ml -1. The method has been used for the determination of trace vanadium in vegetables, and the recovery is 96%～101%.