双显色剂协同显色光度法测定锡  

Study on the Synergistic Coloration of Tin(Ⅱ) with Pyrocatechol Violet and Rhodamine B and Its Application

作　　者：刘文明[1] 马卫兴[1] 钱保华[1] 张明星[1] 

机构地区：[1]淮海工学院化工系,连云港222005

出　　处：《光谱学与光谱分析》1999年第5期765-767,共3页Spectroscopy and Spectral Analysis

摘　　要：　在ｐＨ ５．０ 的ＮａＡｃ－ＨＡｃ缓冲溶液中， ＰＶＡ 存在时， 锡和邻苯二酚紫（ＰＶ） 与罗丹明Ｂ（ＲｈＢ） 生成离子缔合物， 其组成为Ｓｎ∶ＰＶ∶ＲｈＢ＝ １∶２∶４。缔合物最大吸收波长为５６０ ｎｍ ， 表观摩尔吸光系数ε＝１．１８×１０５ Ｌ·ｍ ｏｌ－ １ ·ｃｍ － １ 。锡量在０～１５ μｇ／２５ｍ Ｌ范围内符合比耳定律。拟定方法已用于某些样品中微量锡的测定， 结果满意。In the presence of PVA,a sensitive color reaction of tin(Ⅱ) on pyrocatechol violet and rhodamine B has been studied.In a NaAc HAc(pH=5 0) medium,tin(Ⅱ) ions form an ions associate complex with pyrocatechol violet and rhodamine B.The composition of the complex is Sn(Ⅱ)∶PV∶RhB=1∶2∶4.The maximum absorption of the ions associate complex is at 560 nm with an apparent molar absorptivity of 1 18×10 5 L·mol -1 ·cm -1 .Beer′s law is obeyed in the range of 0—15 μg/25mL of tin.The method is highly selective and has been applied to the determination of trace tin in some objects with satisfactory results.

关 键 词：锡 邻苯二酚紫 罗丹明B 协同显色 分光光度法 

分 类 号：O614.432[理学—无机化学]