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胶束增溶光度法测定微量钒已有报导,用2-(5-溴-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)-H_2O_2测定钒的方法也有报导。本文在此基础上研究了在表面活性剂8176存在下,用5-Br-PADAP光度法测定钒(V)的适宜条件及络合物的组成,提出了一个重现性好,灵敏度高,操作简便的测定矿石中微量钒的新方法。络合物(1:1)的最大吸收波长和表观摩尔吸光系数分别为590nm和9.06×10~4l·mol~(-1)·cm~(-1),最低检测限为0.008μg/ml,在0.2～16μgV(V)/25ml范围内遵守比尔定律,并满意地应用于硅酸盐和铁矿石中钒的测定。 1.主要试剂与仪器:
Micellar solubilization spectrophotometry for the determination of vanadium has also been reported. Methods for the determination of vanadium with 2- (5-Br-PADAP) -H 2 O 2 have also been reported. Based on this, the suitable conditions for the determination of vanadium (V) with 5-Br-PADAP in the presence of surfactant 8176 and the composition of complex have been studied. A new method with good reproducibility, high sensitivity, Simple and convenient method for determination of trace vanadium in ore. The maximum absorption wavelength and apparent molar absorptivity of the complex (1: 1) were 590 nm and 9.06 × 10 -4 l · mol -1 cm -1, respectively. The minimum detection limit was 0.008 μg / ml Beer’s law was observed in the range of 0.2 to 16 μgV (V) / 25 ml and satisfactorily applied to the determination of vanadium in silicates and iron ores. 1. The main reagents and equipment: