KBrO3-Fe(Ⅱ)-双吡啶阻抑光度法测定饮用水中微量溴酸盐  

Determination of trace bromate in drinking water by inhibition-spectrophotometry of KBrO3-Fe(Ⅱ)-BPY

作　　者：黎克纯 付望 张颜 凌敏 刘细祥 Li Kechun;Fu Wang;Zhang Yan;Ling Min;Liu Xixiang(School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530006,China;Guangxi Key Laboratory for Polysaccharide Materials and Modifications)

机构地区：[1]广西民族大学化学化工学院,广西南宁530006 [2]广西多糖材料与改性重点实验室

出　　处：《无机盐工业》2020年第8期78-80,共3页Inorganic Chemicals Industry

基　　金：国家自然科学基金(41967030);广西高校中青年教师科研基础能力提升项目(2019KY0171,2019KY0180);广西民族大学校级科研项目(2018MDYB004);广西民族大学人才启动项目(2018KJQD08)。

摘　　要：在p H=2.7的条件下,Br O32-对Fe(Ⅱ)-双吡啶(2,2′-bipyridine,BPY)显色体系有明显的阻抑作用,据此建立了一种测定饮用水中微量Br O32-的新方法。实验考察了p H、超声时间、显色剂用量和显色时间对溴酸盐测定的影响。在选定条件下,该方法的线性范围为0.2~1.0 mg/L(R2=0.9993),检出限为0.0026 mg/L。该法用于饮用水中Br O32-含量的测定,其RSD均小于5%(n=3),加标回收率为92.8%~101.5%,能满足饮用水中微量Br O32-的测定要求。Under the condition of p H=2.7,there was a significant inhibition of Br O32-on the chromogenic reaction of Fe(Ⅱ)-BPY system,so a new method was established for determination of trace Br O32-in drinking water.The influence of p H,ultrasonic time,dosage of chromogenic agent and coloration time on the determination of trace Br O32-was discussed.Under the comfirmed conditions,the absorbance value was linearly correlated to bromate concentration in the range of 0.2~1.0 mg/Lwith the correlation coefficient of 0.9993.The detection limit was found to be 0.0026 mg/L.This method was applied to determine the content of Br O32-in drinking water and RSD was less than 5%(n=3),the recoveries were in the range of 92.8%~101.5%,which can satisfy the requirements for determinating trace Br O32-in drinking water.

关 键 词：溴酸盐 Fe(Ⅱ)-双吡啶体系 阻抑作用 分光光度法 

分 类 号：TQ131.13[化学工程—无机化工]