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偶氮氯膦类显色剂曾用于钢铁和镍基合金等材料中稀土的测定,近期,文献报导了用二溴硝基偶氮氯麟作铈组稀土显色剂并用于镍基合金和彩色显像管玻璃中铈的测定。我们应用这一新型稀土显色剂进行了直接光度法测定铜合金中铈组稀土的研究,籍EDTA-Zn盐和氟化铵掩蔽伴存离子,用六偏磷酸钠褪色作参比抵消基体的干扰。试样酸溶后即可分液在磷酸-EDTA
Chlorophosphonazo-based developers have been used for the determination of rare earths in materials such as steel and nickel-based alloys. Recently, dibenzo nitroazo chlorinated polycrystalline rare earths have been reported in the literature for use in nickel-based alloys and Determination of cerium in color picture tube glass. We use this new rare earth chromogenic reagent for direct spectrophotometric determination of rare earth cerium group of copper alloy, EDTA-Zn salt and ammonium fluoride concealed by coexisting ions, with sodium hexametaphosphate fading as a reference to offset the substrate interference. Acid-soluble sample can be separated in the phosphoric acid-EDTA