采暖季北京大气PM10中硫酸盐与硫氧化率的观测研究;

SO42-是PM10中的重要组成成分，其形成过程受到多个因子的影响。本文利用高频的自动在线分析系统连续观测了采暖季北京大气中的SO42-与硫氧化率，并探讨了它们与气态前体物、氧化剂、气象因子等的关系。结果表明在采暖季SO42－仍然是PM10中的重要组成部分，并且与SO2显著线性相关，燃煤仍然是采暖季的主要污染来源；非污染期的SO42-来源于远距离输送的老化气团，硫氧化率高，O3浓度的增加对SO2的转化有促进作用；污染期SO42-来源于局地的一次排放，硫氧化率低；整个观测期内风速对颗粒物中SO42-浓度影响较大，温度、相对湿度与SO42-和硫氧化率无明显相关关系。

Study on sulfate and sulfur oxidation ratio in PM10 during heating season in Beijing

Sulfate is a major component of PM_(10) 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 PM_(10) was sulfate and there was a significant correlation between sulfate and SO_2 during heating season in Beijing.Coal burning was still the primary pollution source in heating season. During non-pollution period,SO_4~(2-) was mainly from aged air mass with high sulfur oxidation ratio which was promoted by O_3 during long range transportation.During pollution period,SO_4~(2-) was mainly from original source with lower sulfur oxidation ratio which had no obvious correlation with O_3.Except wind speed,there were no significant correlations bwteen meterological facotrs and sulfate and between meteorological factors and sulfur oxidation ratio during observation.