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纯镍和镍镁合金中微量镁的测定,至今须采用分离手段,直接测定未见有报道。这是由于镍-铬变酸2R络合物与镁络合物的吸收峰波长重合,故镍严重干扰镁的测定。资料报道镍的允许量25微克。本文以乙二胺为掩蔽剂,使与大量镍形成淡青紫色的Ni-乙二胺络合物,为直接测定镁奠定了基础。在PH10.9的氨性介质中,以乙二胺-三乙醇胺联合,掩蔽镍及其它杂质元素,用铬变酸2R显色获得满意的结果,方法简便。镁在20μg/50ml内符合比
Pure nickel and nickel-magnesium alloy in the determination of trace amounts of magnesium so far have to use separation methods, no direct determination of the reported. This is due to nickel - chromium sour 2R complex with the absorption peak of magnesium complexes wavelength coincidence, so nickel seriously interfere with the determination of magnesium. Data reported that the allowable amount of nickel 25 micrograms. In this paper, ethylenediamine as a masking agent, with a large number of nickel to form a light purple Ni-ethylenediamine complex for the direct determination of magnesium laid the foundation. In the ammonia medium of PH10.9, ethylenediamine-triethanolamine combination, masking nickel and other impurity elements, chromium chromogenic acid 2R color rendering satisfactory results, the method is simple. Magnesium in 20μg / 50ml in line with the ratio