A new catalytic kinetic spectrotmetic method for the determination of nanotrace vanadium based on index reaction between potassium bromate and Calmagite (R)in H3PO4 medium has been established. The optimum conditions had been investigated. The calibration curves are obtained over the range 0～100pg/ml of vanadium and detection limit was 2.36 pg/ml. The apparent activation energy of this catalytic reaction was found to be 44.91kJ/mol and the apparent rate constant of this catalytic reaction was found to be 1.45×10-3 s-1. The method has been applied to determination of vanadium in water samples with satisfactory results.%在磷酸介质中,钒(V)强烈的催化溴酸钾氧化钙指示剂褪色的指示反应,研究了该催化反应的最佳实验条件,建立了测定钒的新方法.方法的测定范围是0～100pg/ml,检出限为2.36pg/ml.催化反应的表观活化能为44.91kJ/mol,表观速率常数为1.45x10<'-3> s<'-1>.方法用于水样中痕量钒的测定,结果满意.
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