间接分光光度法测定空气中微量氯气  

Indirect Spectrophotometric Determination of Microamount of Chlorine in Air

作　　者：高小红[1] 马玉龙[1] 吴春姗[1] 汤军[1] 曾洁[1] 姬乔娜[1] 

机构地区：[1]武汉理工大学华夏学院化学与制药工程系,武汉430223

出　　处：《理化检验（化学分册）》2013年第8期918-919,923,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：空气中的氯气经氢氧化钠溶液吸收后生成次氯酸钠，再经盐酸酸化释放出游离氯，游离氯能够定量地将碘化物氧化为单质碘，利用淀粉作为显色剂建立了间接分光光度法测定氯气的方法。反应体系的最大吸收峰值于570nm处，氯的质量浓度在1．0mg·L-1以内与吸光度之差△A呈线性关系．检出限（3s／是）为5×10-6mg·L。方法用于模拟气体和工厂附近空气样品分析。用标准加入法测得回收率在101％～103％之间，测定值的相对标准偏差（n=5）均小于2％。Chlorine in air was absorbed vnth INaOH solution to tom INaLR）, wlalcn was reacteo vvm tart to rcmase free chlorine, lodide was quantitatively oxidized to Ie by Clz and reacted with starch to give a blue colored product, with absorption maximum at the wavelength of 570 nrrL Linear relationship between values of AA and rnqss concentration of chlorine was kepl in the range within 1.0 mg L- 1, with detection limit （3s/le） of 5 X 10 mg I, i. The proposed method was applied to the analysis of samples of simulated gas and air nearby the factory. Values of recovery found bv standard addition method were in the ranges of 101%- 103%with RSD＇s less than 2%.

关 键 词：氯气 分光光度法 空气 

分 类 号：O657.32[理学—分析化学]