LC/MSMS를 이용한 광주지역 초미세먼지 MSA 농도 및 육상기원 2차 유기성분과의 관계

Abstract

Understanding sources of PM2.5 methanesulfonic acid (MSA) from land originated emissions can provide valuable information for ambient sulfate formation. This study determined the main chemical compositions of PM2.5 (i.e., organic carbon (OC), elemental carbon (EC), water soluble organic carbon (WSOC), water-soluble ions, and secondary organic products using liquid chromatography tandem mass spectrometry (LC/MSMS). The sampling sites at the Gwangju Institute of Science and Technology were selected for comprehensive PM investigations in the wintertime of 2017 and 2018. As a result, MSA presents higher correlation coefficient of 0.88 with secondary organic compounds of land originated 2,3-dihydroxy-4-oxopentanoic Acid (DHOPA), 3-hydroxyglutaric Acid (3-HGA). However, lower correlation coefficient of 0.21 with levoglucosan is shown. This study can provide land originated sources into the MSA, which could be a contributor of sulfate in PM2.5.