紫外分光光度法测定水中微量溴酸盐的含量

Determination of Trace Bromate in Water by UV Spectrophotometry

基于BrO3-与I-在酸性介质中发生氧化还原反应形成具有紫外吸收的I3-的性质,采用了紫外分光光度法测定水体中微量溴酸盐含量,方法加标回收率在98%～102%之间,相对标准偏差RSD为1.7%,线性相关系数为0.9991,检测限为4.0μg/L,能满足现有标准的检测要求。

A simple ultraviolet-spectrophotometric method was developed for the Determination of bro mate in water samples. Bromate reacts with iodide in acidic media to produce tri-iodide which has a UV ab- sorbance at 288 nm and thus can be monitored spectrophotometrically. The recovery of bromate Determi- nation by UV spectrophotometry was 98%-102%, and the relative standard deviation was 1.7%（n=9）. The calibration equation for bromate analysis has a good linearity with regression coefficient of 0. 9991. The detection of limit for bromate was 4.0 tLg/L, showing that the method can meet the testing require ment.