Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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The Analytical Bias of Total Hydrocarbon (THC) Measurements in Relation to the Selection of Standard Gas Compound

총탄화수소의 계측에서 표준시료성분의 선택에 따른 오차 발생 연구

  • Kim, Ki-Hyun (Department of Environment & Energy, Sejong University)
  • 김기현 (세종대학교 환경에너지융합학과)
  • Received : 2010.04.23
  • Accepted : 2010.08.04
  • Published : 2010.08.31
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Abstract

In this article, the performance of the THC analyzer was inspected using two different span gases of methane ($CH_4$) and propane ($C_3H_8$). To explore the effect of standard gas selection, MicroFID system was tested by the following procedures. Initially, the system is spanned by propane gas of 60 ppm (or 180 ppmC). The system is then run against methane standards prepared at 5 different concentrations of 200, 250, 300, 400, and 500 ppm. According to the suggestion of the KMOE's test procedure to use multiplying a factor of 3 (for propane), the resulting THC values derived by methane standards were systematically biased with ~500% error relative to true value. This paper discusses the interpretation procedures to obtain the least biased THC values for a given span set-up.

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References

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