丽春红S褪色分光光度法测定溴酸根离子的研究  

Study on the Fading Photometric Determination of Micro-amounts of Bromate with Ponceau S

作　　者：曾艳霞[1] 蒋锋 沙鸥[1] 马卫兴[1] 李树安[1] 许兴友[1] 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005 [2]连云港杰瑞药业有限公司,江苏连云港222006

出　　处：《淮海工学院学报（自然科学版）》2008年第3期52-54,共3页Journal of Huaihai Institute of Technology:Natural Sciences Edition

基　　金：江苏省高校自然科学研究计划资助项目(05KJB150003)

摘　　要：在盐酸介质中,依据溴酸根离子氧化丽春红S褪色的原理提出了测定溴酸根离子的新方法,研究了测定的最佳条件。测定的最大吸收波长λmax为510 nm,溴酸根离子在0.5-5.0μg/mL范围内符合比尔定律,线性回归方程为A510=0.318 5ρ-0.040 6,相关系数为0.994 94,表观摩尔吸光系数为4.08×10^4L/（mol.cm）。该法可用于化学试剂中的微量溴酸根测定,结果满意。A new photometric method for the determination of micro-amounts of bromate is proposed based on the oxidation of Ponceau S in HCl medium. The optimal conditions were studied. The maximum absorption of Ponceau S lies at 510 nm. A decrease of Ponceau S absorbance results from its oxidation by bromate, and a linear relationship is established between the decrease of absorbanee and bromate concentration of 0.5-5.0μg/mL. Beer＇s law is obeyed with the regression equation A510 =0. 318 5ρ-0. 040 6, the related coefficient 0. 994 94 and the Molar absorbance coefficient 4.08× 10^4 L/（mol · cm）. The proposed method has been applied to the determination of micro-amounts of bromate in chemical reagents with satisfactory results.

关 键 词：丽春红S 溴酸根离子 褪色分光光度法 

分 类 号：O657.3[理学—分析化学]