Validation of SOC Estimation Using OC and EC Concentration in PM2.5 Measured at Seoul

The organic carbon in the ambient particulate matter (PM) is divided into primary (POC) and secondary (SOC) by their formation way. To regulate PM effectively, estimation of amount POC SOC separately one important consideration. Since cannot be measured directly, previous studies have evaluated determination Elemental Carbon (EC) tracer method. EC method a estimating value from calculating determining (OC/EC)pri which ratio values OC combustion source. In this study, three different approaches were applied to concentrations PM2.5 at Seoul for (OC/EC)pri: 1) minimum OC/EC during measurement period; 2) regression analysis vs. select lower 5-20% ratio; 3) has lowest correlation coefficient (R2) between reported as R squared (MRS). Each are 0.35, 1.34, 1.77, respectively 1-h data. We compared data with 24-h revealed that estimated had twice larger than due low time resolution sampling. finally confirmed most appropriate calculated atmosphere.