硼钼杂多酸-罗丹明B缔合显色反应的研究与应用  

Colour reaction of the ion-associate complex of molybdoboric heteropoly acid-rhodamine B and its application

作　　者：刘淑萍[1] 刘占峰 

机构地区：[1]河北理工学院化工系,唐山063009 [2]威格拉斯仪器(北京)有限公司,北京100015

出　　处：《分析试验室》2001年第3期43-45,共3页Chinese Journal of Analysis Laboratory

基　　金：河北省自然科学基金资助项目

摘　　要：研究了在聚乙烯醇存在下 ,罗丹明 B( RDB)与硼钼杂多酸的离子缔合显色反应。在合适的硫酸介质环境下 ,形成硼钼杂多酸 ,再与 RDB形成离子缔合物 ,其 λmax=570 nm,ε570 =1 .0× 1 0 5L· mol-1· cm-1,硼浓度范围在 0～1 .2μg/2 5m L符合比尔定律。用等摩尔连续变化法 ,平衡移动法确定 B∶ Mo∶RDB=1∶ 7∶ 4。A new colour reaction of ion associate complex of molybdoboric heteropoly acid rhodamine B in the presence of polyvingl alcohol was studied. The ion associate complex exhibits maximum absorptivity at 570 nm, its apparent molar absorpivity was found to be 1.0×10 5. Beer's law is obeyed in the range of 0 to 1.2 μg/25 mL for boracium. The molar ratio of B to RDB and B to Mo in ion associate complex was established to be 1∶4 and 1∶7 by the equimolar continual shift method and the equilibrium shift method. The complex is supposed to be an ion associate complex with the possible formula of [BMo ⅤMo Ⅵ 6O 24 ]. The poroposed method was used to determine trace boracium in sintering are sample with satisfactory results.

关 键 词：硼钼杂多酸 罗丹明B 分光光度法 硼 微量分析 缔合显色反应 

分 类 号：O613.81[理学—无机化学] O657.32[理学—化学]