二苯碳酰二肼分光光度法测定空气中二氧化硫  

Diphenylcarbazide Spectrophotometric Determination of Sulfur Dioxide in Air

作　　者：李峰[1] 周源[2] 

机构地区：[1]湖南师范大学化学化工学院,长沙市麓山南路410081 [2]湖南师范大学医学院

出　　处：《光谱实验室》2009年第5期1233-1235,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：用三乙醇胺为吸收液,采集空气中的二氧化硫。在酸性条件下,二氧化硫与C^(6+)反应,过量的Cr(6+)用二苯碳酰二肼显色测定,以此间接测定空气中微量二氧化硫。最大吸收波长位于550nm,方法的检出限为1.0μg/5mL,线性范围1.2-2.0μg/L,精密度为5.5%。方法简单方便,试剂安全无毒,适用于现场测定。Triethanolamine was used as absorbent fluid,sulfur dioxide in the air was absorbed. The absorbed sulfur dioxide reacted with Cr^（6＋）,the excessive Cr^（6＋） reacted with diphenylcarbazide and formed a color compound,and was determined by spectrophotometry.So the trace sulfur dioxide in air was determined indirectively at 550nm.The detection limit is 1.0μg/5mL in the linear range of 1.2—2.0μg/L,precision is 5.5%.The method is easy,safe,without toxic reagents.

关 键 词：二苯碳酰二肼 分光光度法 空气 二氧化硫 

分 类 号：O657.32[理学—分析化学]