光度法测定镁在国内比较常采用的方法有二甲苯胺兰Ⅱ、铬变酸2R、铬黑 T、达旦黄以及二甲苯胺兰与镁的胶束增溶等。然而这些方法都存在着不同程度的缺点。新镁试剂偶氮氯膦-Ⅰ近几年来已用于测定微量镁。并取得了满意的结果。经过比较和实验,证明它和近年合成的兴多偶氮氯膦-Ⅰ(未正式投产)一样,是迄今为 Spectrophotometric determination of magnesium in the country are more commonly used methods are two toluidine blue II, chromate 2R, chrome black T, up to yellow and the dimethylamine and micellar micellar solubilization. However, these methods all have different degrees of shortcomings. New magnesium reagent chlorophosphonazo-I has been used in recent years for the determination of trace magnesium. And achieved satisfactory results. After comparing and experimenting, it is proved that it is the same as the synthesized polychlorinated bisphosphono-I (not put into production) in recent years,