研究了在酸性介质中痕量钒 (Ⅴ )催化KIO3 氧化变色酸及抗坏血酸体系的反应和动力学条件 ,建立了催化动力学光度法测定痕量钒 (Ⅴ )的新方法.该方法的检出限为0.04μg/L ,线性范围为0～0.5mg/L ,该方法用于水样及人发中痕量钒(Ⅴ)的测定 ,结果令人满意. The reaction and kinetic conditions for the oxidation of chromotropic acid and ascorbic acid catalyzed by trace vanadium (Ⅴ) in acidic media were studied, and a new catalytic spectrophotometric method for the determination of trace vanadium (Ⅴ) was established. The detection of The limit of detection was 0.04 μg / L with a linear range of 0 ~ 0.5 mg / L. The proposed method was applied to the determination of trace vanadium (Ⅴ) in water and human hair with satisfactory results.