一、存在的问题磷矿石中的P_2O_5用酸碱容量法测定,对磷钼酸铵沉淀的洗涤,用硝酸钾溶液,应该是用1/46×P_2O_5的因数计算结果。然而,对P_2O_5标准溶液的回收测定证明,用这个因数计算出的结果都偏高。偏高范围均在0.3～0.5%之间(表1)。 First, the existing problems Phosphate rock P_2O_5 acid-base volumetric method for the determination of ammonium phosphomolybdate precipitation washing, with potassium nitrate solution, should be 1/46 × P_2O_5 factor calculation results. However, the recovery of the P_2O_5 standard solution proved that the results calculated using this factor are both high. High range of 0.3 to 0.5% (Table 1).