Research Article
Chemical Characteristics of High PM Episodes Occurring in Spring 2014, Seoul, Korea
Table 1
Thermal program of EC/OC analysis.
| | Program activity | Carrier gas | Time (seconds) | Program temperature |
| | Oven purge | Helium | 10 | Ambient | | 1st ramp | Helium | 60 | 250 | | 2nd ramp | Helium | 60 | 500 | | 3rd ramp | Helium | 60 | 650 | | 4th ramp | Helium | 90 | 850 | | Cool for EC w/fan | Helium | 30 | — | | Stabilize temperature | Helium | 45 | 550 | | 1st ramp | Helium/oxygen | 90 | 650 | | 2nd ramp | Helium/oxygen | 90 | 775 | | 3rd ramp | Helium/oxygen | 120 | 940 | | External standard calibration and cool-down | Cal. gas + helium/oxygen | 120 | — |
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