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关于微量钙的测定国内外亦有不少报导,特别是随着稀土金属的广泛应用对于稀土中微量钙的测定尤为重要。例如,日本对彩色电视机用氧化钇的成分,在1970年规定其氧化钇含量最低不少于99.9％,其主要杂质钙要求小于10ppm。而到1979年,则要求氧化钇含量不少于99.99％,钙要求小于7ppm。目前对稀土氧化物中微量钙的测定大多是采用原子吸收法和火焰光度法。利用化学分析法进行测定的主要加有乙二醛缩双法(GBHA法),但此法的稳定性较差。为此,通过试验我们拟定了稀土氧化物中微量钙的偶氮胂(Ⅰ)分光光度测定法。采用在pH=9-10时,用氨水和铜试剂沉淀
On the determination of trace amounts of calcium, there are many reports at home and abroad, especially with the extensive use of rare earth metals for the determination of trace amounts of rare earth calcium is particularly important. For example, in Japan, the composition of yttrium oxide for color television sets stipulated in 1970 was that its yttrium oxide content should be at least 99.9% and its main impurity calcium requirement should be less than 10 ppm. By 1979, yttrium oxide content of not less than 99.99%, calcium requirement of less than 7ppm. At present, the determination of trace calcium in rare earth oxides is mostly by atomic absorption spectrometry and flame photometry. The main method of chemical analysis for the determination of glyoxal shrink double method (GBHA method), but the stability of this method is poor. To this end, we have developed arsenazo (I) spectrophotometric assay of trace amounts of calcium in rare earth oxides. Precipitation with ammonia and copper reagents at pH = 9-10