| 朔州市市区PM2.5中元素碳、有机碳的分布特征 |
| 摘要点击 4375 全文点击 1279 投稿时间：2014-06-11 修订日期：2014-09-15 |
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| 中文关键词 PM2.5 元素碳 有机碳 相关性 二次有机碳 |
| 英文关键词 PM2.5 elemental carbon organic carbon correlation secondary organic carbon |
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| 中文摘要 |
| 采集朔州市市区4个点位采暖季和非采暖季环境空气PM2.5样品,利用Elementar Analysensysteme GmbH vario EL cube型元素分析仪测定其中元素碳(elemental carbon, EC)和有机碳(organic carbon, OC)含量,并对碳组分的浓度水平、时空分布特征和主要来源进行分析.结果表明,朔州市市区非采暖季PM2.5中OC和EC的平均浓度为(14.3±2.7)μg·m-3和(10.3±3.1)μg·m-3,采暖季OC、EC平均浓度分别为(23.3±5.9)μg·m-3和(20.0±5.7)μg·m-3; 4个点位OC和EC的浓度均表现为采暖季大于非采暖季,其中在采暖季,点位SW中OC和EC浓度分别为28.5μg·m-3和28.1μg·m-3,高于其它采样点,在非采暖季,点位PS中OC和EC的浓度分别为17.7μg·m-3和14.1 μg·m-3高于其它采样点; 采暖季和非采暖季PM2.5中OC/EC值均小于2,但OC和EC相关性不好(在采暖季和非采暖季的相关系数分别为0.66和0.52),说明PM2.5中碳气溶胶来源复杂. 控制碳组分一次排放来源,如燃煤烟尘、生物质燃烧及机动车尾气排放,同时关注二次污染是控制朔州市PM2.5的关键. 朔州市市区采暖季和非采暖季PM2.5中二次有机碳(secondary organic carbon, SOC)浓度分别为(6.44±2.77)μg·m-3和(4.11±1.92)μg·m-3. |
| 英文摘要 |
| PM2.5 samples were collected at four sampling sites in Shuozhou during the heating and non-heating periods. Organic carbon (OC) and elemental carbon (EC) in PM2.5 were analyzed by Elementar Analysensysteme GmbH vario EL cube and the concentration, spatial and temporal distribution characteristics and main sources of OC and EC were studied. The results were as following: average concentrations of OC and EC in PM2.5 during non-heating period were (14.3±2.7) μg·m-3 and(10.3±3.1)μg·m-3 while (23.3±5.9) μg·m-3 and (20.0±5.7) μg·m-3 during heating period. The concentrations of OC and EC at four sites during the heating period were higher than those during the non-heating period. The concentrations of OC and EC at SW site during heating were the highest which were 28.5 μg·m-3 and 28.1μg·m-3 while the concentrations at PS sites during non-heating period were the highest, which were 17.7 μg·m-3 and 14.1μg·m-3. The ratios between OC and EC during the heating and non-heating period were all below 2 and the correlation between OC and EC was not good with R2 of 0.66 during heating period and 0.52 during non-heating period which indicated that sources of carbon aerosols were complex. Carbonaceous aerosol pollution should be reduced by controlling the primary emissions such as coal combustion, vehicle exhaust and biomass burning, and by paying attention to secondary pollution at the same time to improve the air quality in Shuozhou City. The concentrations of SOC during heating and non-heating period were (6.44±2.77) μg·m-3 and (4.11±1.92) μg·m-3. |
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