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研究了在磷酸介质中柠檬酸存在下痕量Ｖ（Ⅴ） 催化溴酸钾氧化对氯偶氮氯膦的反应及反应的动力学条件， 建立了催化动力学光度法测定痕量Ｖ（Ⅴ）的新方法， 该方法的检出限为４－７３×１０－１１ ｇ／ｍｌ， 线性范围为０－００１ ～１０ μｇ／２５ ｍｌ。将该体系用于巯基葡聚糖凝胶（ＳＤＧ） 分离后测定痕量Ｖ（ Ⅴ） ， 方法的选择性、灵敏度都很高。用于样品中痕量Ｖ（ Ⅴ） 测定，结果令人满意。
The kinetic conditions for the reaction of trace potassium (Ⅴ) to chloro-chlorophosphonazo and the reaction conditions in the presence of citric acid in phosphoric acid medium were studied. A new kinetic spectrophotometric method for the determination of trace V (Ⅴ) Method, the detection limit of this method is 4-73 × 10-11 g / ml, the linear range of 0-001 ~ 10 μg / 25 ml. The system was applied to the determination of trace V (Ⅴ) after the separation of mercapto-dextran gel (SDG). The selectivity and sensitivity of the method were high. For the determination of trace V (V) in the sample, the results are satisfactory.