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在非离子型微乳液(OP/n-C5H11OH/n-C7H16/H2O)存在下,乙基紫与磷钼钒杂多酸在0.7～1.0 mol/L H2SO4介质中形成吸附型离子缔合物,该缔合物的组成为磷钼钒杂多酸:乙基紫=1:2,最大吸收波长为612 nm,表观摩尔吸光系数ε=1.58×l05L.mol-1.cm-1,磷质量浓度在0.026～0.4μg/mL范围内符合比尔定律,检测限为0.4μg/50 mL,用该方法测定了钢中的磷,RSD<5%。
In the presence of nonionic microemulsion (OP / n-C5H11OH / n-C7H16 / H2O), ethyl violet forms an adsorbed ion-association with phosphomovanadophosphoric acid in a 0.7-1.0 mol / The complex has the composition of phosphorus molybdovanadophosphoric acid: ethyl violet = 1: 2, the maximum absorption wavelength is 612 nm, the apparent molar absorptivity ε = 1.58 × l05 L · mol -1 · cm -1, the mass of phosphorus Beer’s law was obeyed at a concentration range of 0.026-0.4 μg / mL with a detection limit of 0.4 μg / 50 mL. The phosphorus in the steel was determined by this method with a RSD <5%.