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正磷酸根离子在酸性介质中与钼酸盐及偏钒酸盐反应生成稳定的黄色络合物,在提取液柠檬酸浓度不超过0.34g/100ml条件下,波长420nm时用示差法测定其光密度。
Orthophosphate ions react with molybdate and metavanadate to form a stable yellow complex in an acidic medium. When the concentration of citric acid in the extract is not more than 0.34 g / 100 ml and the wavelength is 420 nm, density.