기준채널 교정기술을 적용한 광산란 기반 초미세먼지 측정기의 측정 신뢰도 평가

서지정보

· 발행기관 : 한국대기환경학회
· 수록지 정보 : 한국대기환경학회지 / 38권 / 3호 / 341 ~ 353페이지
· 저자명 : 박승식, 류준호, 정시원, 김광련, 박후경

초록

Attention has been attracted to low-cost light-scattering based dust monitors (LSMs) to conduct exposure assessment and measure continuously the concentrations of ambient PM10 and PM2.5. However, by a lack of calibration on these LSMs, their accuracy and reliability are often unknown which limit their application in scientific research. In the LSM, the particle number concentration is counted and then transferred to mass concentration as the output. The measurements of particles by light scattering method, however, are often affected by factors such as the high relative humidity, particle size distribution, and chemical composition. In this study, referenced-channel calibration method was applied to improve their accuracy and precision among the light-scattering PM2.5 monitors. In comparison with the β-gauge monitor, better accuracy and correlation (R2) were obtained in PM2.5 concentrations observed with LSM applied with referenced-channel calibration method (“NEW LSM”) than those from conventional LSM. In addition, the relative precision of PM2.5 measurements among three LSMs was found to be excellent in the NEW LSMs (0.1~14.5%), rather than in the conventional LSMs (0.2~27.2%).
Results from this study suggest that high quality PM2.5 data measured by newly-upgraded LSMs will effectively be utilized in predicting future PM2.5 concentrations in urban areas. However, a long-term study is required to improve the reproducibility and accuracy of the PM2.5 measurements made by the light-scattering based dust monitors applied with the referencedchannel calibration technology in the future.

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