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国内外测定五氧化二磷多采用钼蓝比色法。此法重现性好,操作简便,灵敏度尚能满足要求,三价磷共存时无干扰。空气中五氧化二磷与水作用生成磷酸,磷酸与钼酸铵所生成的黄色化合物磷钼酸,可被抗坏血酸、氯化亚锡、硫酸肼、硫酸亚铁等还原剂还原成蓝色的钼蓝。由于还原剂种类不同,显色强度、稳定性和
Determination of phosphorus pentoxide at home and abroad to use molybdenum blue colorimetric method. This method reproducibility is good, easy to operate, the sensitivity can still meet the requirements, co-existence of trivalent phosphorus without interference. P2O5 and water in the air to generate phosphoric acid, phosphoric acid and ammonium molybdate generated yellow compound phosphomolybdic acid, can be reduced by ascorbic acid, stannous chloride, hydrazine sulfate, ferrous sulfate and other reducing agents to blue molybdenum blue. Due to the different types of reducing agents, color strength, stability and