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广州冬季气溶胶中水溶性有机物和类腐殖质的吸光性和荧光光谱特性
摘要点击 340  全文点击 101  投稿时间:2018-07-19  修订日期:2018-08-27
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中文关键词  水溶性有机物(WSOC)  类腐殖质(HULIS)  三维荧光-平行因子分析  吸光性  荧光光谱特性
英文关键词  water soluble organic compounds(WSOC)  humic-like substances(HULIS)  EEM-PARAFAC  light absorption  fluorescence characteristics
作者单位E-mail
范行军 安徽科技学院资源与环境学院, 凤阳 233100 fanxingjun99@163.com 
余旭芳 安徽科技学院资源与环境学院, 凤阳 233100  
操涛 安徽科技学院资源与环境学院, 凤阳 233100
中国科学院广州地球化学研究所有机地球化学国家重点实验室, 广州 510640 
 
王艳 安徽科技学院资源与环境学院, 凤阳 233100  
肖新 安徽科技学院资源与环境学院, 凤阳 233100  
谢越 安徽科技学院资源与环境学院, 凤阳 233100  
李飞跃 安徽科技学院资源与环境学院, 凤阳 233100  
宋建中 中国科学院广州地球化学研究所有机地球化学国家重点实验室, 广州 510640 songjzh@gig.ac.cn 
彭平安 中国科学院广州地球化学研究所有机地球化学国家重点实验室, 广州 510640  
中文摘要
      利用紫外-可见光谱与三维荧光-平行因子分析法(EEM-PARAFAC),研究了广州市2014年12月~2015年1月大气气溶胶中水溶性有机物(WSOC)和类腐殖质(HULIS)的吸光性和荧光光谱特征.结果表明,广州冬季气溶胶中HULIS的芳香性(SUVA254)、腐殖化程度(HIX)和光吸收效率(MAE365)均高于WSOC.利用EEM-PARAFAC从WSOC和HULIS解析出了类富里酸(C1)、类腐殖酸(C2)和类蛋白(C3)这3种荧光组分.其中类腐殖质组分(C1+C2)分别占WSOC和HULIS中总荧光组分的78%和85%,说明类腐殖荧光组分是WSOC和HULIS的最主要组成,且HULIS富集了更多的WSOC中主要的类腐殖组分.另外,灰霾期的WSOC和HULIS表现出更高的芳香性、腐殖化程度和C2组分,说明灰霾期有助于大分子量吸光性有机质的形成.相关性分析结果显示,WSOC和HULIS的C1组分相对含量与HIX、MAE365、OCsec、K+、SO42-和NH4+呈现极显著的负相关关系,而C2与它们之间存在极显著的正相关关系.由此说明,WSOC和HULIS中C1的降低和C2的增加会引起它们的腐殖化程度和光吸收能力的增强;同时生物质燃烧排放和二次气溶胶过程可能有助于C2组分的增加.
英文摘要
      The light absorption and fluorescence characteristics of atmospheric water-soluble organic compounds (WSOC) and humic-like substances (HULIS) during the winter season in Guangzhou were examined using UV-vis spectroscopy and excitation-emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC). The results showed that the SUVA254, HIX, and MAE365 values of HULIS were higher than those of WSOC, suggesting that the former had higher aromaticity, humification, and light-absorption capacity in winter atmospheric PM2.5 in Guangzhou. EEM-PARAFAC analysis identified three fluorescence components, including fulvic-like acid (C1), humic-like acid (C2), and protein-like (C3) components. The total humic-like components (C1+C2) accounted for 78% and 85% for WSOC and HULIS, respectively, which indicated that humic-like fluorescence components were the major components for both WSOC and HULIS and that HULIS were enriched with the dominant humic-like fluorophores. In addition, the aromaticity, humification, light-absorbing capacity, and C2 levels of WSOC and HULIS during the haze episode were significantly higher than those in the non-haze episode. This suggested that the water-soluble organics with higher molecular weights and stronger light-absorption capacities tended to form during the haze episode. The correlations analysis revealed strong negative correlations between C1 levels of WSOC and HULIS and HIX, MAE365, OCsec, K+, SO42-, and NH4+. Additionally, strong positive correlations were observed between C2 levels and the same factors. These results implied that the decrease in C1 and increase in C2 might lead to increased humification and light-absorption in WSOC and HULIS, and biomass burning and secondary organic aerosols might contribute to the C2 component.

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