退色光度法测定微量溴酸根离子  

Spectrophotometric determination of bromate by decolouring methyl orange

作　　者：刘文明[1] 马卫兴[1] 

机构地区：[1]江苏淮海工学院化工系

出　　处：《化学试剂》1999年第3期164-165,共2页Chemical Reagents

摘　　要：研究了在盐酸介质中，溴酸根氧化甲基橙使其退色的最佳条件，提出了测定微量ＢｒＯ３－的新方法。最大吸收波长为５１０ｎｍ，表观摩尔吸光系数ε为１．０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，ＢｒＯ３－量在０～２５μｇ／２５ｍＬ内符合比耳定律。该法用于某些化学试剂中微量ＢｒＯ３－的测定，结果满意。n this paper,the decolouring reaction which results from the oxidation of methyl orange by bromate in HCl medium has been studied.The decrease in colour is directly proportional to the amount of bromate.The maximum absorption is at 510nm and the apparent molar absorptivity is 1.0105Lmol-1cm-1.Beers law is obeyed from 0 to 25g/25mL for bromate.The method has been used for the determination of bromate in chemical reagents with good results.

关 键 词：甲基橙 溴酸根 测定 褪色光度法 

分 类 号：O613.43[理学—无机化学]