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利用磷钼杂多酸测磷,这是众所周知的,但用于钼的测定,还未见报道。本文提出在含MoO_4~(2-)溶液中,过量PO_4~(3-)的存在下使之形成磷钼杂多酸,经抗坏血酸还原后,直接用于钼的测定,方法十分简便。在测定波长690nm处,摩尔吸光系数为7.0×10~2,钼量在0—12mg/mL范围内符合比尔定律,满足高含量钼快速分析的要求。方法用于钼铁中钼的测定,获得较为满意的结果。
Phosphorus molybdenum heteropoly acid measured phosphorus, which is well known, but for the determination of molybdenum has not been reported. In this paper, it is proposed that the method of forming molybdophosphoric heteropoly acid in the presence of excessive PO 4 - (3-) in MoO 4 ~ (2-) solution is directly used for the determination of molybdenum after reduction with ascorbic acid. The method is very simple. The molar absorptivity is 7.0 × 10 ~ 2 at the wavelength of 690nm and Beer ’s law is obeyed in the range of 0-12mg / mL, which satisfies the requirement of rapid analysis of high content of molybdenum. The method was applied to the determination of molybdenum in ferromolybdenum, and the satisfactory results were obtained.