钼催化-共振瑞利散射光谱法测定痕量溴酸根  

Resonance Rayleigh Scattering Determination of Trace Bromate in Drinking Water Using Polyvinyl Alcohol-Boric Acid-iodine System

作　　者：李重宁 汤雪萍[1,2,3] 邓雯靓 温桂清[1,2,3] 刘庆业[1,2,3] 梁爱惠[1,2,3] 蒋治良[1,2,3] 

机构地区：[1]广西师范大学珍稀濒危动植物生态与环境保护教育部重点实验室,广西桂林541004 [2]广西师范大学广西污染控制理论与技术重点实验室,广西桂林541004 [3]广西师范大学环境与资源学院,广西桂林541004

出　　处：《广西师范大学学报（自然科学版）》2015年第3期111-116,共6页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(21477025;21465006;21267004;21367005;21365011;21467001;21447006;21307017;21567005);广西自然科学基金资助项目(2013GXNSFFA019003;2014GXNSFAA118050;2014GXNSFAA-118059)

摘　　要：在盐酸介质及硼酸存在条件下,Mo（VI）催化溴酸根离子氧化I-形成I2,I2与硼酸及聚乙烯醇（PVA）反应形成蓝绿色络合物,在670nm处有一个最大吸收峰,在369nm处有一个最大共振瑞利散射峰。在选定的条件下,其吸光度和共振瑞利散射强度随着溴酸根浓度增大而线性增强,由此建立了光度法和共振瑞利散射法测定饮用水中溴酸根的新方法。BrO-3质量浓度分别在0.1-2μg/L和1-30μg/L与共振瑞利散射强度增大值ΔI和吸光度增大值ΔA呈线性关系,检出限分别为0.05μg/L和0.5μg/L。采用共振瑞利散射光谱法测定饮用水中的溴酸根,得到了满意的结果。In hydrochloric acid medium containing boric acid, Mo（VI） catalyzed bromate oxidation ofiodine ion to form iodine, and then it reacted with polyvinyl alcohol to form blue green complex. Itexhibited a maximum absorption peak at 670 nm, and a maximum resonance scattering peak at 369nm.In the selected conditions, there was a good linear relationship between the absorbance and resonanceRayleigh scattering intensity and the concentration of a certain range of bromate. Therefore, two newmethods of determination of bromate were put forward in drinking water with spectrophotometry andresonance Rayleigh scattering. By using the spectroph0tometric method, the regression equation was AA---- 0.086pr --0.013, the linear range was from 1 to 30 μg/L, with a detection limit of 0.5 μg/L. Byusing the resonance Rayleigh scattering method, the regression equation was AI =406.44pro ＋36.36,the linear range was from 0.1 to 2 μg/L, with a detection limit of 0.05μg/L. Bromate in drinking waterwas determined by using resonance Rayleigh scattering method with satisfactory results.

关 键 词：溴酸根 催化 聚乙烯醇 共振瑞利散射 

分 类 号：O657.3[理学—分析化学]