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有资料提出,测定钢铁中稀土总量时,在石英烧杯内用硫硝混酸溶样,冒硫酸烟控制酸度在0.1～0.5N时,稀土与偶氮氯膦Ⅲ(CPAⅢ)生成1:1蓝色络合物,最大吸收峰在660～670nm处,0～25μg稀土/25ml,符合比尔定律,但此法不适于高硅试样(如球铁),本文采用在玻璃烧杯中加硫硝混酸溶样,不必冒硫酸烟,虽显色酸度稍有变化,但经试验表明,对稀土与CPAⅢ的显色反应没有不良影响,且易掌握,分析时间
Some data suggest that the determination of the total amount of rare earths in steel, sulfur and sulfuric acid in the quartz beaker mixed with acid sample, take sulfuric acid smoke control acidity at 0.1 ~ 0.5N, rare earth and chlorophosphonazo Ⅲ (CPA Ⅲ) generated 1: 1 blue Color complex, the maximum absorption peak at 660 ~ 670nm, 0 ~ 25μg RE / 25ml, in line with Beer’s Law, but this method is not suitable for high silicon samples (such as ductile iron), this paper used in glass beaker plus sulfur mixed nitrate Sample solution, do not take sulfuric acid smoke, although the color slightly change the acidity, but the test showed that the rare earth color reaction with CPA Ⅲ no adverse effects, and easy to grasp, analysis of time