微量磷的测定一般用磷钼蓝比色法,但此法As(Ⅴ)定量干扰,且灵敏度不够高。极谱法间接测定磷和固体电极阴极溶出伏安法测定微量磷已有报道,但都因其手续冗长,实际上应用不多。利用锑(Ⅲ)与磷(Ⅴ)、钼(Ⅵ)形成三元杂多酸,用抗坏血酸等还原剂进行还原后形成磷锑钼三元杂多蓝进行分光光度法测定可以提高灵敏度和显色速度。在此体系中加入适量含氧有机溶剂丙酮,可以进一步提高还原速度和有色物的稳定 Determination of trace phosphorus in general with phosphomolybdate blue colorimetric method, but this method quantitative As (Ⅴ) interference, and the sensitivity is not high enough. Indirect determination of phosphorus and solid electrode by polarographic method Cathodic stripping voltammetric determination of trace phosphorus has been reported, but because of the lengthy procedure, in fact, not much application. The use of antimony (Ⅲ) and phosphorus (Ⅴ), molybdenum (Ⅵ) to form ternary heteropolyacid, with ascorbic acid and other reducing agents to form phosphorus antimony molybdenum ternary heteropoly blue spectrophotometric determination can improve the sensitivity and color speed. In this system by adding an appropriate amount of oxygen-containing organic solvent acetone, you can further improve the reduction rate and the stability of colored objects