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本文研究了钒(V)在过氧化氢存在下与2—(3.5—二氯—2—吡啶偶氮)—5—二甲氨基苯酚(筒称3.5—dicl— DMPAP)形成三元络合物的条件及其组成。试验表明,络合物最大吸收波长为580nm,摩尔吸光系数ε_(580)=4.6×10~4,组成为V(V):3.5—dicl—DMPAP:H_2o_2=1:1:1,钒浓度在0～20μg/25ml内符合比尔定律。在磷酸介质中、除铜、钴钯允许量较小外,其它常见离子允许量均较大,该法已用于矿样及钢样中微量钒的测定。方法速度快、灵敏度较高、选择性好。
In this paper, the formation of ternary complexes of vanadium (V) with 2- (3,5-dichloro-2-pyridylazo) -5-dimethylaminophenol The conditions and their composition. The results showed that the maximum absorption wavelength of the complex was 580 nm, the molar extinction coefficient ε 580 was 4.6 × 10 4, the composition was V (V): 3.5-dicl-DMPAP: H 2o 2 = 1: 0 ~ 20μg / 25ml within the Bill’s law. In the phosphoric acid medium, in addition to the allowable amount of copper and cobalt and palladium, the allowable amount of other common ions are large, the method has been used for the determination of trace vanadium in ore samples and steel samples. The method is fast, sensitive and selective.