微波炉浓缩甲基橙光度法测定饮用水中溴酸盐的研究  

Study on determination of trace bromate in drinking water by microwave concentrating methyl orange spectrophotometry

作　　者：杨敏[1] 谢静[1] 杨树科[1] 刘丹[1] 王红斌[1] 

机构地区：[1]云南民族大学民族药资源化学国家民委-教育部重点实验室,化学与生物技术学院,昆明650500

出　　处：《分析试验室》2012年第3期55-58,共4页Chinese Journal of Analysis Laboratory

基　　金：民族药资源化学国家民委-教育部重点实验室开放基金(MZY1121)项目资助

摘　　要：建立了一种微波浓缩甲基橙分光光度法测定水中溴酸根离子的方法。考察了酸度、时间、温度和甲基橙用量对测定方法的影响。分别对从各大超市购买的不同瓶装饮用水,经过微波炉浓缩后,用甲基橙分光光度法进行测定。其结果与离子色谱标准方法对比,结果表明:两种方法测定同一水样的相对误差小于7.0%。溴酸根离子氧化甲基橙使其褪色的最大吸收波长为510nm;溴酸根离子的浓度在0.0～1.0 mg/L范围内符合比尔定律。回归方程为:Y=0.9299X-0.0001,相关系数为r=0.9992。A method for microwave concentrating methyl orange spectrophotometric determination of trace bromate in drinking water was established. The effects of acidity, time, temperature and the amount of methyl orange on the determination method were investigated. The bottle drinking water of experiment was from different major supermarkets. Samples were concentrated by microwave and determinated by spectrophotometry and the results were compared with those by ion chromatographic standard method. The results show that the maximum absorption wavelength of decolouring reaction for oxidation of methyl orange by bromatin is 510nm and bromate concentration in the range of 0. 0 - 1.0 μg/mL is obeyed Beer＇s Law. The regression equation is Y = 0. 9299× - 0.0001, and the correlation coefficient is 0. 9992. The relative error of two methods is less than 7.0%. The advantages of spectrophotometry are affordable, easy operation, good stability, and it can be used for the determination of trace bromate in drinking water.

关 键 词：溴酸盐 微波浓缩 甲基橙分光光度法 离子色谱法 

分 类 号：O657.3[理学—分析化学]