定电位电解法测定烟气中SO_2的干扰问题及解决方法  

Problems and Solution on the Interference in Sulfur Dioxide Analysis with Fixed-potential Electrolysis

作　　者：谢馨[1] 柏松[1] 

机构地区：[1]南京市环境监测中心站,江苏南京210013

出　　处：《环境监控与预警》2010年第5期25-26,共2页Environmental Monitoring and Forewarning

摘　　要：烟气的含湿量、负压、干扰气体都会对SO2监测数据产生一定干扰,有时甚至会严重偏离实际值。基于定电位电解法测定烟气中SO2的原理,提出采样管设置加热冷凝功能;测试过程注意采样流量变化,当负压超过2.3kPa临时压力时需采取前置抽气泵消除压力;以及计算干扰气体临界浓度,进行软件修正等解决方法。Gas pressure,moisture content and interference gas could affect sulphur dioxide concentration monitoring,and sometimes even produce a gravely deviates.Based on the principle of sulfur dioxide measured by fixed-potential electrolysis,we proposed several solutions：adding heating/condensing function on the sampling tube,keeping a suitable sampling flow and using prepositive pump to reduce the subpressure when it is beyond 2.3kPa,calculating the critical concentration,modifying the software,and so on.

关 键 词：二氧化硫 含湿量 负压 干扰气体 

分 类 号：X830[环境科学与工程—环境工程]