紫外光在线催化氧化快速测定高锰酸盐指数  

Determination of Permanganate Index by Flow Injection Analysis with On-line UV-photocatalytic Oxidation and Spectrophotometry

作　　者：冯丽[1] 张新申[2] 冷庚[1] 李绍波[1] 但德忠[1] 

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]四川大学轻纺与食品学院,成都610065

出　　处：《分析化学》2012年第4期630-633,共4页Chinese Journal of Analytical Chemistry

基　　金：国家863课题基金(No.2007AA09210101)资助

摘　　要：将紫外光催化氧化与流动注射技术结合,建立了一种基于KMnO4褪色反应的在线光催化氧化光度法快速测定高锰酸盐指数的新方法。最佳实验条件为:检测波长525nm,进样量300"L,聚四氟乙烯反应管长300cm,KM-nO4浓度0.4mmol/L,H2SO4浓度0.3mol/L,氧化液流速0.65mL/min,载流流速0.85mL/min,15W低压汞灯。方法线性范围为0.5～10mg/L;检出限为0.1mg/L;相对标准偏差<2%(n=6);加标回收率为84.0%～97.0%,分析速度为20样/h。本方法避免了光催化剂的二次污染,实现了水体中高锰酸盐指数的低成本、快速、自动在线分析。By combined of UV-photocatalytic oxidation with flow injection technique, a novel method for the determination of permanganate index by spectrophotometry based on the discoloration reaction of permanganate solution with on-line UV-photocatalytic oxidation has been developed. A 300μL sample solution was injected into carrier stream, merged with a 4 mmol/L permanganate solution containing 0.3 mol/L H2SO4, passed through a 300-cm polytetrafluoroethylene （PTFE） photo-reaction coil wound around a 15-W UV lamp and detected at wavelength of 525 nm. Flow rates of 0. 65 mL/min and 0.85 mL/min were selected as optimum for the oxidant and carrier stream respectively. The sample throughput was 20 h-1 , with a limit of detection of 0.1 mg/L and a linear range of 0.5-10 mg/L. The method had good precision with relative standard deviation 〈12 % （n=6）. The recoveries of river water samples were 84.0%-97.0%. The proposed method avoids the secondary pollution of photocatalyst and enables time and cost efficient and on-line analysis of permanganate index in waters.

关 键 词：紫外光催化氧化 流动注射 在线分析 高锰酸盐指数 水质监测 

分 类 号：X832[环境科学与工程—环境工程]