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动力催化分光光度法测定天然水中ppb级钒的优点是灵敏度高,不需进行预浓缩就可直接取样分析。其测定原理是基于钒在某些氧化还原反应中具有催化作用。其反应速度又与钒的含量有定量关系,所以从反应速度的变化,就可以测定体系中钒的含量。我们在前人工作基础上,选择钒催化溴酸盐氧化没食子酸的反应来测定水样中钒。其测定浓度范围为2～100ppb,钒回收率达95%左右,但铁、铜等离子共存时干扰测定,特
The catalytic spectrophotometric determination of ppb grade vanadium in natural water has the advantage of high sensitivity and direct sample analysis without preconcentration. The determination principle is based on the catalytic effect of vanadium in some redox reactions. The reaction rate and the content of vanadium has a quantitative relationship, so from the reaction rate changes, you can determine the system of vanadium content. On the basis of our predecessors’ work, we chose vanadium to catalyze the reaction of bromate oxidation of gallic acid to determine vanadium in water samples. The determination of the concentration range of 2 ~ 100ppb, vanadium recovery rate of about 95%, but the iron and copper ions interfere with the determination of coexistence, special