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广西玉林市大气PM10和PM2.5中有机碳和元素碳污染特征分析
摘要点击 447  全文点击 160  投稿时间:2017-02-19  修订日期:2017-07-31
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中文关键词  PM10  PM2.5  有机碳  元素碳  玉林
英文关键词  PM10  PM2.5  organic carbon(OC)  element carbon(EC)  Yulin
作者单位E-mail
黄炯丽 广西壮族自治区环境保护科学研究院,南宁 530022 huangjiongli123@163.com 
陈志明 广西壮族自治区环境保护科学研究院,南宁 530022  
莫招育 广西壮族自治区环境保护科学研究院,南宁 530022
复旦大学环境科学与工程系,上海 200433 
 
李宏姣 广西壮族自治区环境保护科学研究院,南宁 530022  
杨俊超 广西壮族自治区环境保护科学研究院,南宁 530022  
刘慧琳 广西壮族自治区环境保护科学研究院,南宁 530022  
毛敬英 广西壮族自治区环境保护科学研究院,南宁 530022 13978185061@163.com 
梁桂云 广西壮族自治区环境保护科学研究院,南宁 530022  
张达标 广西壮族自治区环境保护科学研究院,南宁 530022  
吴熊平 玉林市环境监测站,玉林 537000  
郝爽 玉林市环境监测站,玉林 537000  
中文摘要
      2015年7月~2016年3月期间在广西玉林市3个空气监测点位共采集环境大气颗粒物PM10样品218份,PM2.5样品202份,利用多波段热/光碳分析仪分析其颗粒物中有机碳和(OC)和元素碳(EC)浓度水平、时空变化、污染特征及可能来源.结果表明,玉林市PM10中OC和EC质量浓度分别为10.99 μg·m-3和5.11 μg·m-3;PM2.5中OC和EC质量浓度分别为7.51 μg·m-3和4.70 μg·m-3.3个监测点位大气中PM10和PM2.5冬季的OC和EC浓度水平均高于其他季节,PM10、PM2.5中OC和EC的相关性较好,R2分别为0.58和0.60(P均小于0.01).应用最小OC/EC比值法对二次有机碳(SOC)含量进行了估算,冬季大气PM10和PM2.5中SOC平均质量浓度分别为14.50 μg·m-3和6.74 μg·m-3,高于其他季节.PM10和PM2.5中SOC/OC比值均 > 0.5,玉林市大气中粗细颗粒物均以SOC为主.夏季PM10和PM2.5中SOC/OC分别为80.6%和77.7%,为四季最高值,与夏季温度较高、光照强烈、有利于光化学反应将OC转化为SOC有关.
英文摘要
      Two hundred eighteen PM10 and 202 PM2.5 samples were collected at three sampling sites to study the pollution characteristics of carbonaceous aerosols in Yulin from July 2015 to March 2016. Organic carbon (OC) and elemental carbon (EC) in the PM10 and PM2.5 samples were analyzed by a Multiwavelength Thermal/Optical Carbon Analyzer, and the characteristics, including pollution levels, temporal and spatial distributions, and possible sources of OC and EC, were investigated. The results showed that the OC and EC mass concentrations in PM10 in Yulin were 10.99 and 5.11 μg·m-3, respectively, while the OC and EC mass concentrations in PM2.5 were 7.51 and 4.70 μg·m-3, respectively. Strong correlations between OC and EC were found in PM10(R2=0.58) and PM2.5(R2=0.60). The winter average concentrations of secondary organic carbon (SOC) in PM10 and PM2.5 were 14.50 μg·m-3 and 6.74 μg·m-3, respectively. The SOC/OC ratios in both the PM10 and PM2.5 were higher than 0.5. The contribution of SOC to OC was 80.6% in PM10 and 77.7% in PM2.5, which were the highest in the summer, in accordance with the high temperature and strong solar radiation in the summer.

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