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[학술저널]

  • 학술저널

이복진(전남대학교) 박승식(전남대학교)

DOI : 10.5572/KOSAE.2019.35.3.357

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초록

In this study, a GRIMM dust monitor (hereafter, OPC) and TSI optical particle sizer (OPS), which utilize light scattering technique for real-time monitoring of particle number and concentration, were evaluated based on the gravimetric and beta-ray absorption methods during the period from March 12 to April 09, 2018 at an urban site. For this purpose, 24-hr integrated PM2.5 samples were collected and analyzed for ionic species. Hourly average PM10 and PM2.5 concentrations from OPS were 2.7 and 1.7 times higher than those from GRIMM OPC, respectively, and also 1.9 and 1.7 times higher than those from betaray absorption method (BAM). However, highest PM2.5/PM10 value was found in GRIMM OPC. The PM2.5/PM10 was 0.85±0.09, 0.50±0.20, and 0.53±0.17 for OPC, OPS, and BAM, respectively, indicating rather underestimation of PM10 from GRIMM OPC. 24-hr average PM2.5 from OPC and OPS was approximately 3% (an intercept of +9.3 μg/㎥) lower and 63% (an intercept of +3.3 μg/㎥) higher than that from the gravimetric method, respectively, with R2 values of 0.93 and 0.82. However, 24-hr average PM2.5 from BAM was strongly correlated with the gravimetric method with a slope of 0.96, an intercept of 3.4 μg/㎥, and an R2 of 0.97, suggesting high reliability of BAM. Also the difference in 24-hr PM2.5 between gravimetric method and OPS increased negatively with increasing the concentrations of secondary inorganic components (=NO₃-+NH₄++SO₄2-), NO₃-, NH₄+, and SO₄2- However, secondary ionic species concentrations were very poorly correlated (R2=~0.00) with the difference in 24-hr PM2.5 between the gravimetric method and GRIMM OPC, suggesting GRIMM dust monitor provides a reliable and real-time measurements of PM2.5. Finally, results from this study indicates that PM10 and PM2.5 from TSI OPS and PM10 from GRIMM OPC should be corrected to obtain their real concentrations based on the gravimetric method and/or BAM.

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Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
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