定电位电解法测定烟气中SO2的干扰问题及解决方法

谢馨; 柏松

引用本文:	谢馨,柏松.定电位电解法测定烟气中SO2的干扰问题及解决方法[J].环境监控与预警,2010,2(5):25-26
	XIE Xin,BAI Song.Problems and Solution on the Interference in Sulfur Dioxide Analysis with Fixed-potential Electrolysis[J].Environmental Monitoring and Forewarning,2010,2(5):25-26

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定电位电解法测定烟气中SO2的干扰问题及解决方法
谢馨,柏松
南京市环境监测中心站，江苏南京 210013

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。

关键词: 二氧化硫含湿量负压干扰气体

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

XIE Xin,BAI Song

Nanjing Environmental Monitoring Central Station, Nanjing, Jiangsu 210013, China

Abstract:

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.

Key words: sulfur dioxide moisture content negative pressure interference gas