Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul
Abstract The organic carbon in the ambient particulate matter (PM) is divided into primary organic carbon (POC) and secondary organic carbon (SOC) by their formation way. To regulate PM effectively, the estimation of the amount of POC and SOC separately is one of the important consideration. Since S...
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| Format: | Article |
| Language: | English |
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Springer
2022-02-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.210388 |
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| author | Ha Young Yoo Ki Ae Kim Yong Pyo Kim Chang Hoon Jung Hye Jung Shin Kwang Ju Moon Seung Myung Park Ji Yi Lee |
| author_facet | Ha Young Yoo Ki Ae Kim Yong Pyo Kim Chang Hoon Jung Hye Jung Shin Kwang Ju Moon Seung Myung Park Ji Yi Lee |
| author_sort | Ha Young Yoo |
| collection | DOAJ |
| description | Abstract The organic carbon in the ambient particulate matter (PM) is divided into primary organic carbon (POC) and secondary organic carbon (SOC) by their formation way. To regulate PM effectively, the estimation of the amount of POC and SOC separately is one of the important consideration. Since SOC cannot be measured directly, previous studies have evaluated the determination of SOC by the Elemental Carbon (EC) tracer method. The EC tracer method is a method of estimating the SOC value from calculating the POC by determining (OC/EC)pri which is the ratio of the measured values of OC and EC from the primary combustion source. In this study, three different approaches were applied to OC and EC concentrations in PM2.5 measured at Seoul for determining (OC/EC)pri: 1) the minimum value of OC/EC ratio during the measurement period; 2) regression analysis of OC vs. EC to select the lower 5-20% OC/EC ratio; 3) determining the OC/EC ratio which has lowest correlation coefficient value (R2) between EC and SOC which is reported as minimum R squared method (MRS). Each (OC/EC)pri ratio of three approaches are 0.35, 1.34, and 1.77, respectively from the 1-h data. We compared the (OC/EC)pri ratio from 1-h data with 24-h data and revealed that (OC/EC)pri estimated from 24-h data had twice larger than 1-h data due to the low time resolution of sampling. We finally confirmed that the most appropriate value of (OC/EC)pri is that calculated by a regression analysis of 1-h data and estimated SOC values at PM2.5 of the Seoul atmosphere. |
| format | Article |
| id | doaj-art-f2b1c903a9c64001bbe039bcda27b41b |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2022-02-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-f2b1c903a9c64001bbe039bcda27b41b2025-02-09T12:17:12ZengSpringerAerosol and Air Quality Research1680-85842071-14092022-02-0122411210.4209/aaqr.210388Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at SeoulHa Young Yoo0Ki Ae Kim1Yong Pyo Kim2Chang Hoon Jung3Hye Jung Shin4Kwang Ju Moon5Seung Myung Park6Ji Yi Lee7Department of Environmental Science & Engineering, Ewha Womans UniversityDepartment of Environmental Science & Engineering, Ewha Womans UniversityDepartment of Chemical Engineering & Materials Science, Ewha Womans UniversityDepartment of Health Management, Kyungin Women’s UniversityDepartment of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental ResearchDepartment of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental ResearchDepartment of Air Quality Research, Climate and Air Quality Research Division, National Institute of Environmental ResearchDepartment of Environmental Science & Engineering, Ewha Womans UniversityAbstract The organic carbon in the ambient particulate matter (PM) is divided into primary organic carbon (POC) and secondary organic carbon (SOC) by their formation way. To regulate PM effectively, the estimation of the amount of POC and SOC separately is one of the important consideration. Since SOC cannot be measured directly, previous studies have evaluated the determination of SOC by the Elemental Carbon (EC) tracer method. The EC tracer method is a method of estimating the SOC value from calculating the POC by determining (OC/EC)pri which is the ratio of the measured values of OC and EC from the primary combustion source. In this study, three different approaches were applied to OC and EC concentrations in PM2.5 measured at Seoul for determining (OC/EC)pri: 1) the minimum value of OC/EC ratio during the measurement period; 2) regression analysis of OC vs. EC to select the lower 5-20% OC/EC ratio; 3) determining the OC/EC ratio which has lowest correlation coefficient value (R2) between EC and SOC which is reported as minimum R squared method (MRS). Each (OC/EC)pri ratio of three approaches are 0.35, 1.34, and 1.77, respectively from the 1-h data. We compared the (OC/EC)pri ratio from 1-h data with 24-h data and revealed that (OC/EC)pri estimated from 24-h data had twice larger than 1-h data due to the low time resolution of sampling. We finally confirmed that the most appropriate value of (OC/EC)pri is that calculated by a regression analysis of 1-h data and estimated SOC values at PM2.5 of the Seoul atmosphere.https://doi.org/10.4209/aaqr.210388PM2.5OC/EC ratioPrimary organic carbonSecondary organic carbonEC tracer method |
| spellingShingle | Ha Young Yoo Ki Ae Kim Yong Pyo Kim Chang Hoon Jung Hye Jung Shin Kwang Ju Moon Seung Myung Park Ji Yi Lee Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul Aerosol and Air Quality Research PM2.5 OC/EC ratio Primary organic carbon Secondary organic carbon EC tracer method |
| title | Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul |
| title_full | Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul |
| title_fullStr | Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul |
| title_full_unstemmed | Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul |
| title_short | Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul |
| title_sort | validation of soc estimation using oc and ec concentration in pm2 5 measured at seoul |
| topic | PM2.5 OC/EC ratio Primary organic carbon Secondary organic carbon EC tracer method |
| url | https://doi.org/10.4209/aaqr.210388 |
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