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本实验研究了1-(2-吡啶偶氮)-2-萘酚(简称PAN)与镍形成络合物的组成、络合物的显色条件和共存元素干扰的消除,拟定了矿石中微量镍的测定方法。实验一仪器和主要试剂 1 72型分光光度计,0.5厘米比色皿。 2 PHS-2型酸度计。 3 乙酸-乙酸钠缓冲溶液:1M乙酸溶液,以1M乙酸钠溶液调节至pH=3.5(用酸度计测量)。 4 PAN溶液:0.1%,0.1克PAN溶于100毫升甲醇中。 5 盐酸-乙酸溶液:17毫升浓盐酸和12毫升冰
In this experiment, the composition of complexes of 1- (2-pyridylazo) -2-naphthol (referred to as PAN) and nickel, the color conditions of the complexes and the interference of coexisting elements were studied. Determination of nickel. Experiment with an instrument and the main reagent 72 spectrophotometer, 0.5 cm cuvette. 2 PHS-2 pH meter. 3 Acetic acid-sodium acetate buffer solution: 1 M acetic acid solution, adjusted to pH = 3.5 (measured by pH meter) with 1 M sodium acetate solution. 4 PAN solution: 0.1%, 0.1 g PAN dissolved in 100 ml methanol. Hydrochloric acid-acetic acid solution: 17 ml of concentrated hydrochloric acid and 12 ml of ice