过磷酸钙肥料中磷含量的测定方法探讨

Discussion on the Determination of Phosphorus Content in Calcium Superphosphate Fertilizer

分别采用磷钼酸喹啉重量法、磷钼酸喹啉容量法以及钼酸铵重量法三种方法对过磷酸钙肥料中五氧化二磷的含量进行了分析对比。结果表明,磷钼酸喹啉重量法与容量法测定的五氧化二磷含量较为接近,但磷钼酸喹啉重量法操作过程与容量法相比较为简化,且重现性较好。钼酸铵重量法在测定过程中避免了有毒试剂喹啉的使用,可以考虑作为常规测定五氧化二磷含量的替代方法使用。

The determination of phosphorus content in calcium superphosphate fertilizer was carried out with three different methods of quinolone phosphomolybdate gravimetric method , quinoline phosphomolybdate volumetry method and ammonium molybdate weight method.The results showed that the determination of phosphorus content using quinolone phosphomolybdate gravimetric method and quinoline phosphomolybdate volumetry method was close to each other , however , the quinolone phosphomolybdate gravimetric method was simplified and showed good repeatability.On the other hand , ammonium molybdate weight method considered to be an alternative method for routine determination of phosphorus pentoxide without the use of toxic reagents.