现在国内外测定磷矿石、过磷酸钙及其它磷酸盐中P_2O_5含量大多采用容量法。该法过滤洗涤沉淀至中性很费时时。为了加快过滤洗涤沉淀的速度,日本用古氏坩埚、玻璃纤维滤纸、减压洗涤过滤。因为磷钼酸喹啉在中性和酸性中稳定,笔者在日本方法的基础上,采用双 Now at home and abroad determination of phosphate rock, superphosphate and other phosphate P2O5 content in most of the capacity method. The method of filtering sedimentation to neutral is very time consuming. In order to speed up the speed of filtration and sedimentation, Japan with the ancient crucible, glass fiber filter, vacuum filtration. Because of phosphine molybdate in neutral and acidic stability, the author based on the Japanese method, the use of double