采用乙二胺四乙酸二钠 (EDTA)溶液直接提取过磷酸钙中有效五氧化二磷 ,应用微波加热技术干燥磷钼酸喹啉沉淀。实验表明 ,用 10 0mlEDTA溶液 (0 1mol/L)提取 ,在 (80± 2 )℃恒温下振荡 2 5min ,用微波炉加热干燥磷钼酸喹啉沉淀 15min的测定值 ,与标准方法测定值的绝对差值 <0 15 % ,该方法的相对标准偏差 (RSD) <0 2 % ,精密度和准确度良好 Ethylenediaminetetraacetic acid (EDTA) was used to directly extract effective P2O5 from superphosphate, and the quinolinephosphoric acid was precipitated by microwave heating. Experiments show that the extraction with 10 0EDEDTA solution (0 1mol / L), at (80 ± 2) ℃ constant temperature for 25min, microwave heating and drying of quinoline phosphomolybdate precipitation 15min measured values, and the standard method of determination of absolute Difference <0 15%, the method of relative standard deviation (RSD) <0 2%, good precision and accuracy