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镍铬铈合金本厂用于显像管生产,原来对合金中铈的测定是富集分离基体,以偶氮胂(Ⅲ)显色,周期长,操作繁琐。新显色剂二溴硝基偶氮氯膦(DBNCPA)与铈的显色反应灵敏,摩尔吸光系数达1.15×10~5,配合物最大吸收波长在644nm处,铈量在0～8μg/25ml范围内符合比耳定律。常规共存元素的干扰量在mg量,且酸度范围宽,选择性好。但Cr~(3+)、Ni~(2+)含量高时会产生色度影响。我们试验了用六偏磷酸钠来分解铈与DBNCPA的配合物,消除色度影响,使Ni~(2+)、Cr~(3+)允许量大大地提高,这样可测定含量低至0.0x%的痕量铈。从试样分析结果表明,不但方法简便快速,且精密度和准确度均令人满意。
Nickel - chromium - cerium alloy factory for the CRT production, the original determination of cerium in the alloy is enriched separation matrix to arsenazo (Ⅲ) color, long cycle, the operation cumbersome. The new chromogenic reagent DBNCPA was sensitive to the color reaction of cerium, the molar absorption coefficient was 1.15 × 10 ~ 5, the maximum absorption wavelength of the complex was 644nm, the amount of cerium was 0 ~ 8μg / 25ml Beer’s law is within the range. Conventional coexisting elements interfere with the amount of mg, and a wide range of acidity, good selectivity. However, when Cr 3+ and Ni 2+ are high, chroma will be affected. We tested the use of sodium hexametaphosphate to decompose the complexes of cerium with DBNCPA to eliminate the influence of chromaticity, so that Ni ~ (2 +), Cr ~ (3+) allowance greatly increased, so that the content can be measured as low as 0.0x % Trace cerium. From the sample analysis results show that not only the method is quick and easy, and the precision and accuracy are satisfactory.