|HUANG Qiang, LI Qian, LAN Shuang, LONG Fei.Influence of Span Drift Time on Accuracy of Sulfur Dioxide from Air Automatic Monitoring Station[J].Environmental Monitoring and Forewarning,2015,7(2):29-31
|关键词: 空气自动监测 二氧化硫 跨漂时间
|Influence of Span Drift Time on Accuracy of Sulfur Dioxide from Air Automatic Monitoring Station
HUANG Qiang, LI Qian, LAN Shuang, LONG Fei
Mianyang Environmental Monitoring Center, Mianyang, Sichuan 621000, China
|Using a standard gas from Institute for Environmental Reference Materials of Ministry of Environmental Protection, we analyzed the sulfur dioxide from three air automatic monitoring stations in Mianyang city. Experimental results showed that after span drift the signal response from the sulfur dioxide detection instrument EC9850B ramped quickly to a high value and then increased gradually before tending to stabilize. Comparing monitoring data from the known gas standard, it was established that the response spanned a drift time of 35 minutes before stabilization, and fluctuated near the standard median of the reference gas. Acquiring data starting from this point could improve the accuracy and efficacy of the data, and the quality could be under control.
|Key words: Air automatic monitoring Sulfur dioxide Span drift time