冬季APEC峰会前后室内外VOCs相关性分析

为研究冬季VOCs类物质的室内外相关性,于2014年11月5日~12月11日对一间无人为活动的房间的空气进行了室内外同步采样,定量分析了98种VOCs物质,并将其分为烷烃、烯烃、芳香烃、卤代烃和含氧烃五类,分别讨论了VOCs的浓度水平、I/O、室内外相关系数和分类间的相关系数,并利用质量平衡模型初步估计了室外源对室内VOCs的贡献情况.研究表明,五类VOCs的室内浓度均大于室外浓度,且烷烃>含氧烃>卤代烃>烯烃;五类VOCs均同时存在室内源和室外源;对于VOCs的室内外相关性,烯烃和含氧烃分别为相关性最差和最好的组分,同时,r(卤代烃)>r(烷烃)>r(芳香烃);对于物质间的相关性,烷烃-烯烃的相关性在室内外均最高(rin=0.805,rout=0.888,P￡0.01),卤代烃-含氧烃之间的相关性最差(rin=0.491,P￡0.05;rout=0.529,P￡0.01);室外源对室内浓度的贡献率与VOCs的种类相关,贡献率均值最高的是卤代烃类(56.57%),之后依次是烷烃(46.64%)、烯烃(40.10%)、含氧烃(33.98%)和芳香烃(20.67%).此外,APEC峰会后VOCs的浓度水平、I/O、室内外相关性以及物质间的相关性均高于峰会前的对应值.

Relationship between indoor and outdoor VOCs bofore and after APEC summit

To investigate the relationship between indoor and outdoor VOCs, the air in and out of an idle room were simultaneously sampled from Nov.5 to Dec.11, 2014. 98 kinds of VOCs were quantitated and discussed by dividing them into five categories according to their functional groups, and they are alkanes, olefin, aromatics, halogen and oxygenated hydrocarbons, respectively. In this paper, we disicussed the concentration levels, I/O, indoor and outdoor relevance as well as the correlation between different categories of VOCs. At last, we roughly estimated the contribution of outdoor VOCs sources on indoor VOCs concentration. Results showed that indoor VOCs had higher concentritions than outdoor, and alkanes>oxygenated hydrocarbons>halogen hydrocarbons>olefin. Five categories both had indoor and outdoor sources of VOCs. For the indoor and outdoor relevance of VOCs, olefins were related to the worst while oxygenated hydrocarbons the best. Meanwhile there came to the conclusion that halogen hydrocarbons > alkanes> aromatics. Alkanes-Olefin shared the best correlation both in the indoor and outdoor samples (rin=0.805, rout=0.888, P￡0.01), while halogenated hydrocarbons-oxygenated hydrocarbons shared the worst correlation (rin=0.491, P￡0.05; rout= 0.529, P￡0.01). Outdoor source contribution rate changed between five kinds of VOCs. Halogenated hydrocarbon contributed the most (56.57%), followed by alkanes (46.64%), olefins (40.10%), oxygenated hydrocarbons (33.98%) and aromatics (20.67%). In addition, the concentration levels of VOCs, I/O, indoor and outdoor correlation and the correlation between substances after APEC summit were higher than the corresponding value before the summit.