【摘要】 在光度分析中 ,以合适的微乳液为介质与相同含量的胶束体系比较具有很好的增溶、增敏作用。本文首次以OP/n C5H1 1 OH/n C7H1 6 /H2 O水包油 (O/W )型非离子微乳液为介质 ,对结晶紫 -硅钼杂多酸分光光度法进行了研究。其实验最佳条件为 3 .0mL 2 .5× 10 - 2 mol/L钼酸铵溶液 ,13 .0mL 2 .0mol/L硫酸溶液 ,3 .0mL微乳液 ,6.0mL 1.0× 10 - 3mol/L结晶紫溶液。最大吸收波长为 5 60nm ,表观摩尔吸光系数为 1.85× 10 5,该体系较相应的胶束体系表观摩尔吸光系数提高了3 0 %。在 5 0mL溶液中 ,硅质量在 0～ 7μg范围内符合比尔定律。此法对多种钢样中硅含量进行测定 ,结果准确、操作方便 ,试验条件宽容 ,干扰少更多还原

【Abstract】 In spectrophotometric analysis,the proper microemulsion has more solubilization and sensitization than that micelle has.In this paper, a spectrophotometric method for the deterination of silicon with crystal violet-heteropoly silicornolybdic acid in O/W nonionic microemulsion medium(OP/n-C₅H₁₁OH/n-C₇H₁₆/H₂O) is developed firstly.The optimum conditions for determination of silicon are 3.0 mL 2.5×10^-2 mol/L （NH₄）₂MoO₄,13.0 mL 2.0 mol/L H₂SO₄,3.0 mL microemulsion and 6.0 mL 1.0×10^-3 mol/L crystal violet.The maximum absorption wavelength is 560 nm. The apparent molar absorptivity is 1.85×10⁵ L· mol^-1·cm^-1. In this system it is 30% highter than that of in the micelle system. Beer’s law is obeyed in the range of 0-7 μg Si/50 mL. The method is very accurate and convenient for the determination of silicon in steels.The experiment condition is tolerant and interference rarely exist.更多还原