在硝酸介质中，磷与钼酸铵形成磷钼杂多酸H3［P（Mo3O 10）］蓝色络合物，该络合物波长λmax＝720nm， ε720 ＝1.6×104，磷量在0.10～0.60μg／mL浓度范围内符合朗伯－比尔定 律，硅系合金中常见离子不干扰测定；相对标准偏差2.94％～6.05％。 本法用于硅系合金中磷量的测定，方法灵敏度较高、选择性好、操作简便，结果满意。
In the medium of nitric acid the phosphomolybdic heteropoly blue was formed by phosphorus with ammonium molybdate. The wave length of maximum absorption λmax for this complex was 720nm, ε72 0=1.6×104L／mol*cm. Beer's law was obeyed in the range of 0.10-0.60μg /mL for phosphorus. The common coexisting ions in the series of silicon alloy have no influence on the determination of phosphorus. The relative standard deviations were 2.94%-6.05%. The proposed method has been applied to determine the phosphorus in the series of silicon alloy with higher sensitivity, good selectivity and satisfactory results.
参考文献
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