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当微咸缺氧水样经过二硫酸钾氧化后用钼蓝分光光度法测定其中的总磷时,从总磷和无机磷两者之差求得的有机磷为负值,主要原因是胶态水合氧化铁(Ⅲ)和正磷酸盐的共沉淀,或者由于产生正磷酸铁(Ⅲ)沉淀造成的。采用硝酸和高氯酸氧化可避免此影响。
When the total amount of total phosphorus was determined by the molybdenum blue spectrophotometric method after the oxic acid aqueous solution was oxidized by potassium persulfate, the organic phosphorus obtained from the difference between the total phosphorus and the inorganic phosphorus was negative. The main reason was colloidal Co-precipitation of hydrated iron (III) oxide and orthophosphate, or precipitation of iron (III) orthophosphate. The use of nitric acid and perchloric acid oxidation can avoid this effect.