巯基葡聚糖凝胶分离富集分光光度法测定微量铟的研究

Spectrophotometric determination of indium after separation and enrichment by mercapto-dextran gel

研究了在溴化十六烷基三甲基铵存在下铟与邻氯苯基荧光酮的显色反应。结果表明,在pH5 8～6 6HAc-NaAc缓冲介质中,铟与邻氯苯基荧光酮形成灵敏度很高的紫红色络合物,其ε=2 26×105,于25mL溶液中铟质量在0～12μg范围内符合比尔定律,采用巯基葡聚糖凝胶(SDG)分离富集,使方法的选择性大为提高,可用于多种样品中痕量铟的测定,结果令人满意,由此建立了一种灵敏度高、选择性好的测In 新方法。

A new highly sensitive color reaction of In*# with 2,6,7trihydroxyl9(2'chlorine)3fluorone(oCPF)and CTMAB has been studiedIt is shown that indium*# can form a complex with the above mentioned reagent in the medium of pH60 HAc-NaAc buffer solutionThe apparent molar absorptivity of the complex is 226×105L·mol-1·cm-1 at 580nmThe range of the determination of In*# is 0-12μg/25mL In*# can be separated from the coexisting ions in sample by mercaptodextran gelThe method has been applied to the determination of indium in samples with satisfactory results