徐永福课题组 - Prof. YongFu Xu's Reasearch Group @ IAP CAS - Page 9

本实验室获2013所专用实验室评比三等奖

组内消息 2014-01-03

由所技术委员会和所级中心主任郄秀书、科技处、计财处、行政资产处相关负责人以及技术委员会部分委员等组成的检查组,对我所大型仪器设备及专用实验室的管理工作和年度工作计划执行情况进行了现场检查,听取了实验室负责人的现场汇报,并结合有关部门提交的书面总结报告,检查组进行了认真的总结与评比。经检查组讨论研究决定,评比结果如下:本课题组所负责大气环境监测实验室(徐永福)获“2013年大型仪器设备及专用实验室检查与评比”三等奖。

Effects of Relative Humidity on Ozone and Secondary Organic Aerosol Formation from the Photooxidation of Benzene and Ethylbenzene

组内消息 2013-11-07

SOA samples with heating were heated at 110°C for 15 min
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The formation of ozone and secondary organic aerosol (SOA) from benzene–NO x and ethylbenzene–NOx irradiations was investigated under different levels of relative humidity (RH) in a smog chamber. In benzene and ethylbenzene irradiations, the intensity of the bands of O‒H, C=O, C‒O, and C‒OH from SOA samples all greatly increased with increasing RH. The major substances in SOA were determined to be carboxylic acids and glyoxal hydrates. It was also found that SOA contained aromatic products, and NO2- and ONO2-containing products. The results show that the increase in RH can greatly reduce the maximum O3 by the transfer of NO2- and ONO2-containing products into the particle phase. During the process of evaporation, the lost substances from the collected SOA have similar structures for both benzene and ethylbenzene. This demonstrates that ethyl-containing substances are very stable and difficult to evaporate. For benzene, some of glyoxal hydrates were left to form C‒O‒C- and C˭O-containing species like hemiacetal and acetal after evaporation, whereas for ethylbenzene, glyoxal favored cross reactions with ethylglyoxal during evaporation. Only a few species in SOA were released into the gas phase during evaporation while a large part of SOA remained, which is mainly composed of carboxylic acid. It is concluded that the aqueous radical reactions and the hydration from glyoxal can be enhanced under high RH conditions, which can irreversibly enhance the formation of SOA from both benzene and ethylbenzene. 全文下载

<span style="color: #000000;">Jia L, Xu Y F. Effects of Relative Humidity on Ozone and Secondary Organic Aerosol Formation from the Photooxidation of Benzene and Ethylbenzene. Aerosol Science and Technology, 2014, 48(1):1-12.</span> 

徐老师喜获国家自然科学基金资助

组内消息 2013-08-19

根据国家自然科学基金委员会发布的2013年度国家自然科学基金项目的评审结果,徐永福研究员获2014年度面上项目资助:
负责人:徐永福
项目批准号:41375129
课题名称:二次有机气溶胶在颗粒物表面的形成机制及其光学特性
2014~2017年