在非离子(O/W)型微乳液(OP/n-C5H11OH/n-C7H16/H2O)存在下,磷钼钒杂多酸与乙基紫在0.7—1.0mol/L硝酸介质中形成蓝色的离子缔合物,缔合物的最大吸收波长为612nm,表观摩尔吸光系数ε612为1.58×l05L.mol-1.cm-1,磷含量在0.03—0.4μg/mL范围内符合比耳定律,检出限为0.008μg/mL,用该方法测定铁钙包芯线中的磷,相对标准偏差小于5%,加标回收率在97.5%—101.5%,结果满意。 In the presence of nonionic (O / W) microemulsions (OP / n-C5H11OH / n-C7H16 / H2O), the phosphomolybdic vanadyl heteropolyacid and ethyl violet formed a blue color in a 0.7-1.0 mol / L nitric acid medium Ion complex, the maximum absorption wavelength of the association is 612nm, the apparent molar absorptivity ε612 is 1.58 × l05L.mol-1.cm-1, phosphorus content in the range of 0.03-0.4μg / mL Beer’s Law , The detection limit was 0.008μg / mL. The method was used to determine phosphorus in iron-calcium cored wire. The relative standard deviation was less than 5%, and the recoveries were 97.5% -101.5%. The results were satisfactory.