钢铁、合金及冶金原材料中磷的测定是极为重要的。在冶金分析测定磷的方法中光度法占90％以上。早在六十年代初期,我国就广泛采用了以氟化钠—氯化亚锡还原的磷钼蓝直接光度法,近十年(特别近六年)来光度法测定磷又有了发展。八十年代初文献综述了用物理方法、化学方法和物理 Determination of phosphorus in steel, alloy and metallurgical raw materials is extremely important. In the metallurgical analysis of phosphorus in the method of light accounted for more than 90%. As early as the early 1960s, the phosphomolybdate blue direct spectrophotometric method using sodium fluoride-stannous chloride was extensively adopted in our country. In the last ten years (especially in the past six years), phosphorus has been developed by spectrophotometry. The early 1980s reviewed the use of physical methods, chemical methods and physics