引用本文:丁黄达,缪青,邹强,姚沈良,杨倩,霍玉玲.苏州市一次PM2.5污染过程分析及其来源解析[J].环境监控与预警,2017,9(5):57-61
DING Huang da, MIAO Qing, ZOU Qiang, YAO Shen liang, YANG Qian, HUO Yu lin.Analysis of Pollution Event and Source Apportionment of PM2.5 in Suzhou[J].Environmental Monitoring and Forewarning,2017,9(5):57-61
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苏州市一次PM2.5污染过程分析及其来源解析
丁黄达,缪青,邹强,姚沈良,杨倩,霍玉玲
作者单位
丁黄达1,缪青1,邹强1,姚沈良2,杨倩1,霍玉玲3 1.苏州市环境监测中心江苏 苏州 215004
2.苏州工业园区环境监测中心站江苏 苏州 215021
3.镇江市环境监测中心江苏 镇江 212009 
摘要:
利用TEOM1405F型PM<sub>2.5</sub>测量仪、MARGA水溶性离子在线分析仪和激光雷达对苏州市2016年8月24日—9月6日PM<sub>2.5</sub>、水溶性离子和气溶胶垂直分布进行了观测,结合气象数据分析了水溶性离子的变化规律及其主要来源。结果表明,观测期间PM<sub>2.5</sub>平均值为43.4 μg/m<sup>3</sup>,与 2014和2015年同期相比下降了42.9%和40.3%。总水溶性无机离子平均值为24.18 μg/m<sup>3</sup>,约占ρ(PM<sub>2.5</sub>)55.7%,其中ρ(SO<sup>2-</sup><sub>4</sub>)、ρ(NH<sup>+</sup><sub>4</sub>)和ρ(NO<sup>-</sup><sub>3</sub>)分别占ρ(总离子)的46.0%、25.8%、21.0%。夜间边界层降低,大气垂直扩散条件较差,是造成ρ(PM<sub>2.5</sub>)及ρ(水溶性离子)显著升高的主要原因。ρ(NO<sup>-</sup>3)/ρ(SO<sup>2-</sup>4) 为0.056~1.939,平均值为0.432,表明固定源(燃煤源)仍然是PM<sub>2.5</sub>的主要来源;PCA方法表明苏州水溶性离子的主要来源于二次污染和燃烧源、海盐和土壤源以及地面扬尘、建筑尘。
关键词:  水溶性离子  可入肺颗粒物  垂直扩散  来源解析  苏州
DOI:
分类号:X513
文献标识码:B
基金项目:苏州市科技计划基金资助项目(SS201524)
Analysis of Pollution Event and Source Apportionment of PM2.5 in Suzhou
DING Huang da, MIAO Qing, ZOU Qiang, YAO Shen liang, YANG Qian, HUO Yu lin
Abstract:
The characteristics of PM<sub>2.5</sub> was analyzed by using MARGA IC Analyzer、TEOM1405F instrument and LIDAR, combining with meteorological conditions from August 24 to September 6, 2016 in Suzhou. The average concentrations of PM<sub>2.5</sub> was 43.4μg/m<sup>3</sup>,decreased 42.9% and 40.3% compared with the same period in 2014 and 2015, which indicated that the control measures were effective. The total water soluble inorganic ions was 24.18 μg/m<sup>3</sup>,accounting for 55.7% of PM<sub>2.5</sub>, and ρ(SO<sup>2-</sup><sub>4</sub>),ρ(NH<sup>+</sup><sub>4</sub>) and ρ(NO<sup>-</sup><sub>3</sub>) occupied for 46.0%,25.8%,21.0% of PM<sub>2.5</sub>, respectively. Due to boundary layer was reduced at night, the atmospheric vertical diffusion condition turned worse, the concentration of PM<sub>2.5</sub>and water soluble ionsraised significantly. The range of ρ(NO<sup>-</sup><sub>3</sub>)/ρ(SO<sup>2-</sup><sub>4</sub>) was 0.056~1.939 and the mean value was 0.432, which indicated that the fixed source (firecoal) was still the main source of PM<sub>2.5</sub>. Source of PM<sub>2.5</sub> is mainly derived from secondary pollution and combustion, sea salt and soil source and ground dust, construction dust according to PCA method.
Key words:  Water–soluble ions  PM2.5  Vertical diffusion  Source apportionment  Suzhou