| 福建省三大城市冬季PM2.5中有机碳和元素碳的污染特征 |
| 摘要点击 3187 全文点击 1628 投稿时间：2012-07-11 修订日期：2012-11-07 |
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| 中文关键词 PM2.5 有机碳 元素碳 热光投射法 福建省三大城市 |
| 英文关键词 PM2.5 organic carbon (OC) elemental carbon (EC) thermal optical transmission (TOT) three major cities in Fujian Province |
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| 中文摘要 |
| 以福建省福州、厦门和泉州这3个主要城市为研究对象,采集了冬季PM2.5样品,采用热光透射法(thermal optical transmission,TOT)分析得到PM2.5、OC和EC的浓度水平和空间分布、OC与EC的相关性、OC/EC值以及二次有机碳分布特征. 结果表明,福州、厦门和泉州冬季PM2.5的浓度范围为(79.94±18.08)~(114.78±26.10) μg·m-3,均超过《环境空气质量标准》(GB 3095-2012)规定的PM2.5日均值75 μg·m-3. OC和EC的浓度范围(以C计)分别为(14.77±2.65)~(19.27±1.96) μg·m-3和(1.99±0.50)~(3.36±0.41) μg·m-3,分别是背景点福州平潭的1.2~1.6倍和1.2~2.0倍. 福州平潭(R2=0.70)和晋安(R2=0.66)冬季PM2.5中OC与EC的相关性显著,说明OC和EC有相近的一次污染来源. OC/EC值为5.64~7.71,且值均大于2.0,说明各采样点存在二次有机碳(secondary organic carbon,SOC)的生成. SOC的浓度为2.47~7.17 μg·m-3,占OC的比例为13.08%~45.67%,占PM2.5的2.20%~7.78%. |
| 英文摘要 |
| PM2.5 samples were collected in three cities (Fuzhou, Xiamen and Quanzhou) in Fujian Province, China, during the winter, and were analyzed for organic carbon (OC) and elemental carbon (EC) by thermal optical transmission (TOT). The characteristics such as pollution levels and spatial distributions of PM2.5, OC and EC, correlations between OC and EC, OC/EC ratios and secondary organic carbon (SOC) were discussed in details. Average concentrations of PM2.5 were ranged from (79.94±18.08)μg·m-3 to (114.78±26.10) μg·m-3, which were in excess of the Ambient Air Quality Standards (GB 3095-2012) 24-hr mass-based standards of 75 μg·m-3. Averages concentrations of OC and EC were fluctuated from (14.77±2.65)μg·m-3 to (19.27±1.96) μg·m-3 and (1.99±0.50)μg·m-3to (3.36±0.41) μg·m-3, respectively, which were 1.2 to 1.6 times and 1.2 to 2.0 times more than that in the background site, Pingtan in Fuzhou. Correlations between OC and EC in PM2.5were found to be strong in Pingtan (R2=0.70) and Jin'an (R2=0.66) (Fuzhou), suggesting that there were similar primary pollutants of OC and EC. Average OC/EC ratios were 5.64-7.71 and all higher than 2, which indicated that the secondary organic carbon (SOC) was formed. The estimated concentrations of SOC were from 2.47μg·m-3 to 7.17 μg·m-3, which contributed 13.08%-45.67% to the OC and 2.20%-7.78% to PM2.5. |
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