| 北京APEC期间大气颗粒物中类腐殖酸的污染特征及来源 |
| 摘要点击 2686 全文点击 1199 投稿时间：2015-10-25 修订日期：2015-12-15 |
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| 中文关键词 北京 APEC PM2.5 类腐殖酸 来源 |
| 英文关键词 Beijing APEC PM2.5 humic-like substances(HULIS) source |
| 作者 | 单位 | E-mail | | 周雪明 | 中国科学院大学资源与环境学院, 北京 100049 | zhouxueming14@mails.ucas.ac.cn | | 亓雪娇 | 中国科学院大学资源与环境学院, 北京 100049
同济大学环境科学与工程学院, 上海 200092 | | | 项萍 | 中国科学院大学资源与环境学院, 北京 100049 | | | 谭吉华 | 中国科学院大学资源与环境学院, 北京 100049
清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084 | tanjh@ucas.ac.cn | | 段菁春 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | | | 何晓朗 | 广西大学环境学院, 南宁 530004 | | | 贺克斌 | 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084 | | | 马永亮 | 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084 | |
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| 中文摘要 |
| 为分析北京市APEC期间强化减排措施对大气细颗粒物中类腐殖酸(humic-like substances, HULIS)浓度及污染特征的影响.对APEC前后样品进行了碳质组分(OC/EC)、水溶性有机碳(water-soluble organic carbon, WSOC)、HULIS和水溶性离子分析,研究发现APEC采样期间大气颗粒物中HULIS的浓度范围为1~15 μg·m-3.HULIS浓度在会议减排前、中和后期分别为7.99、5.83和7.06 μg·m-3.会议减排对降低HULIS浓度起到了一定作用.在会议期间HULIS的浓度下降程度明显快于EC与WSOC.会议之后HULIS的浓度上升程度明显慢于OC、EC、WSOC和PM2.5; HULIS占PM2.5的值在采样期间变化不大,在采样期间、会议减排前、中和后期分别为13.60%、13.59%、14.02%和12.22%.HULIS-C/OC的值和HULIS-C/WSOC的值依次为28.95%、35.51%、28.37%、19.93%和52.75%、59.58%、51.54%、45.39%.HULIS与湿度呈显著正相关,与风速呈显著负相关; 生物质燃烧和二次转化可能是北京大气颗粒物中HULIS重要来源. |
| 英文摘要 |
| In order to investigate the influence of the emission reduction measure during the Beijing APEC on the concentrations and pollution characteristics of humic-like substances (HULIS) in atmospheric fine particles, PM2.5samples were collected and analyzed for OCEC, WSOC, HULIS and water-soluble ions. The concentration of HULIS in PM2.5 ranged 1μg·m-3-15μg·m-3. HULIS concentrations were 7.99μg·m-3, 5.83μg·m-3 and 7.06μg·m-3 before, during and after APEC, which indicated emission reduction measure had important effect on the reduction of HULIS. The decrease of HULIS during the APEC was significantly faster than those of EC and WSOC, while the increase of HULIS turned out to be much slower than OC, EC, WSOC and PM2.5 after the meeting. The proportions of HULIS to PM2.5 were 13.60%, 13.59%, 14.02% and 12.22% at four different stages, i.e., whole sampling period, before, during and after the APEC, while HULIS-C/OC and HULIS-C/WSOC were 28.95%, 35.51%, 28.37%, 19.93%; and 52.75%, 59.58%, 51.54%, 45.39%, respectively. HULIS was significantly positively correlated with humidity, while significantly negatively correlated with wind speed. Biomass burning and secondary transformation of VOCs might be two important sources of HULIS in Beijing. |
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