Abstract:

Sulfate is a major component of PM10 in atmosphere and its concentration is affected by many factors. In this article, sulfate concentration and sulfur oxidation ratio in heating season were measured with on-line systems, and the relationships between sulfur oxidation ratio and influencing factors were discussed.
The results showed that the most abundant component of PM10 was sulfate and there was a significant correlation between sulfate and SO2 during heating season in Beijing. Coal burning was still the primary pollution source in heating season. During non-pollution period, SO42- was mainly from aged air mass with high sulfur oxidation ratio which was promoted by O3 during long range transportation. During pollution period, SO42- was mainly from original source with lower sulfur oxidation ratio which had no obvious correlation with O3. Execpt wind speed, there were no significant correlations bwteen meterological facotrs and sulfate and between meteorological factors and sulfur oxidation ratio during observation.

Key words: heating season, sulfate, sulfur oxidation ratio, meteorological factor