| 南京地区大气气溶胶PM2.1中稳定碳同位素组成研究 |
| 摘要点击 1946 全文点击 1294 投稿时间：2013-01-30 修订日期：2013-04-20 |
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| 中文关键词 PM2.1 总碳 稳定碳同位素 后向轨迹 源解析 |
| 英文关键词 PM2.1 total carbon stable carbon isotope back trajectory source apportionment |
| 作者 | 单位 | E-mail | | 吴梦龙 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044 | ayls8088@163.com | | 郭照冰 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044 | guocumt@nuist.edu.cn | | 刘凤玲 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044 | | | 孙德玲 | 中国科学院南京土壤研究所, 南京 210008 | | | 卢霞 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044 | | | 姜文娟 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044 | |
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| 中文摘要 |
| 采用EA-IRMS测定了2011年四季南京市区(南师)和郊区工业区(南化)大气细粒子(PM2.1)中稳定碳同位素组成(δ13C),分析了PM2.1中含碳物质的来源并对两地总碳(TC)污染特征进行了评价. 结果表明,TC在市区和郊区的年平均浓度分别为15.94 μg·m-3与17.17 μg·m-3,TC在细粒子中比重分别为17.18%与16.40%,郊区碳质污染相对严重且细粒子中污染物组成更复杂; 冬、春、夏、秋四季市区PM2.1中δ13C均值分别为-24.42‰±1.12‰、-25.19‰±1.92‰、-25.79‰±0.45‰与-25.58‰±0.65‰,郊区分别为-25.34‰±1.18‰、-25.55‰±1.50‰、-25.31‰±0.55‰与-25.38‰±0.82‰. 相关性分析和潜在污染源δ13C值表明,市区气溶胶PM2.1中碳质主要源于汽油车尾气排放,郊区工业区含碳物质源于尾气及工业排放,此外,燃煤源、生物质燃烧源及地质源等对两地冬春季气溶胶中碳质有重要贡献; 后向轨迹分析表明,冬春季远源输送对南京地区气溶胶中碳质有重要贡献,夏秋季气溶胶中碳质主要来自本地排放. |
| 英文摘要 |
| Stable carbon isotopes (δ13C) in aerosol fine particles (PM2.1) collected in Nanjing Normal University representing urban area, and in Nanjing College of Chemical Technology standing for suburban industrial area, were analyzed using EA-IRMS. Besides, sources of carbonaceous contents were studied and the pollution characteristics of total carbon (TC) were evaluated. The annual average concentrations of TC in urban area and suburban industrial area were 15.94 μg·m-3 and 17.17 μg·m-3, respectively. The proportions for TC in PM2.1 were 17.18% and 16.40%, indicating that carbonaceous pollution was more serious and the pollutants were more complex in suburban industrial area. The average δ13C for winter, spring, summer and autumn were-24.42‰±1.12‰,-25.19‰±1.92‰,-25.79‰±0.45‰ and-25.58‰±0.65‰, respectively in urban area and-25.34‰±1.18‰,-25.55‰±1.50‰,-25.31‰±0.55‰ and-25.38‰±0.82‰, respectively in suburban area. Correlation analysis and isotopic signatures of potential sources suggested that carbonaceous contents mainly came from gasoline vehicles exhaust in urban area, and might be attributed to the vehicle exhaust emissions and industrial emissions in suburban area. In addition, coal combustion,biomass burning and geological sources might have important contribution to aerosols in winter and spring. Back trajectory analysis implied that the long-range transport had considerable contribution to the carbonaceous aerosol in winter and spring. However, the major sources might be attributed to local emissions in the other two seasons. |
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