微乳液离子液体协同增敏磷钼杂多酸-结晶紫显色体系  

Synergistic sensitization of phosphorus molybdenum heteropolyacid-crystal violet chromogenic system by microemulsion and ionic liquid

作　　者：张莹琪[1] 白建武[1] 赵策[1] 

机构地区：[1]太原工业学院化学与化工系,山西太原030008

出　　处：《现代化工》2017年第2期205-207,共3页Modern Chemical Industry

基　　金：山西省高校科技研发项目(20111028)

摘　　要：利用分光光度法研究了O/W型微乳液Triton X-100/n-C5H11OH/n-C9H20/H2O与氯代-1-丁基-3-甲基咪唑离子液体协同对结晶紫-磷钼杂多酸显色体系的增敏作用。在18℃下,通过实验确定了反应的最大吸收波长;显色反应的稳定时间;微乳液和离子液体的体积比及微乳液和离子液体混合液的用量;显色体系的酸度;钼酸铵、结晶紫的用量。在较佳显色条件下,绘制了标准工作曲线,得到的线性回归方程为y=0.171 9x-0.006 1,摩尔吸光系数为1.3×105L/(mol·cm),比单一微乳液中摩尔吸光系数提高了40%。用等摩尔系数法测得磷钼杂多酸与结晶紫缔合比为3∶7,方法的检出限为4×10-6g/L。对5种标准钢样中磷质量分数进行测定,其相对标准偏差均小于3%。通过测定结晶紫的分配系数初步探讨了反应机理。Synergistic sensitization effect of the O/W microemulsion Triton X-100/n-C5H11 OH/n-C9H20/H2 O and chlorinated 1-butyl-3-methyl imidazole ionic liquids on crystal violet-phosphorus molybdenum heteropolyacid chromogenic system has been studied by spectrophotometric method for the first time. The maximum absorption wavelength and the stability time of the chromogenic reaction,the volume ratio of microemulsion and ionic liquid,the amount of microemulsion and ionic liquid mixture,acidity of chromogenic system and the optimal dosage of ammonium molybdateand crystal violet have been determined under the conditions of 18℃ in the experiment. The standard working curves under the best chromogenic conditions have also been plotted. The linear regression equation has been obtained as y = 0. 171 9x-0. 006 1. The molar absorption coefficient is 1. 3 × 10^5L·mol^-1·cm^-1,which is 40% higher than that in the single microemulsion system. The association ratio of phosphorus molybdenum heteropolyacid and crystal violet is measured to be 3 ∶ 7 with equimolar coefficient method and the detection limit is 4 × 10^-6g/L. Relatively standard deviation of this method is less than 3% in the determination of phosphorus content in five kinds of standard steel samples. The reaction mechanism has been preliminarily explored by distribution constant of crystal violet.

关 键 词：微乳液 离子液体 增敏 磷 结晶紫 钼酸铵 分光光度法 

分 类 号：O657.32[理学—分析化学]