| Organic carbon (OC) and elemental carbon (EC) in PM2.5 were determined by NIOSH 5040、870 heating protocol therm-optical transmission (TOT) for on-line monitoring and IMPROVE-A heating protocol thermal optical reflection (TOR) for laboratory analysis, respectively. By comparing and analyzing the test results, it showed that the correlation coefficient between on-line monitoring (NIOSH 5040) and laboratory analysis (IMPROVE-A) was more than 0.8, the overall correlation was good, the difference between EC values was slightly larger. Under NIOSH 870 protocol, TC values measured by on-line monitoring and laboratory analysis were generally similar, while OC values and EC values were slightly different. For on-line monitoring, OC values under NIOSH 5040 protocol were slightly lower than that of 870 protocol, while EC values were slightly higher than that of 870 protocol. Both temperature protocols were optional in daily monitoring. |
