| 安庆市PM2.5碳质组分污染特征及来源解析 |
| Characteristics and Sources of Carbon Component in PM2.5 in Anqing City |
| 投稿时间：2022-05-30 修订日期：2022-08-26 |
| DOI：10.19316/j.issn.1002-6002.2023.06.05 |
| 中文关键词: 有机碳(OC) 元素碳(EC) 二次有机碳(SOC) 来源解析 |
| 英文关键词:organic carbon(OC) element carbon(EC) secondary organic carbon(SOC) source analysis |
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| 中文摘要: |
| 2020年3月2日—2021年2月28日在安庆市政务服务中心楼顶设置监测点,手工采集PM2.5样品,运用多波段碳分析仪(DRI Model 2015)分析样品中碳质组分有机碳(OC)和元素碳(EC)质量浓度;利用OC/EC法、相关分析法和主成分因子分析法对PM2.5中碳质组分的污染特征和可能来源进行解析。结果显示:安庆市手工采样期间PM2.5平均质量浓度为(45.9±28.1)μg/m3,OC和EC的平均浓度分别为(8.0±3.4)、(1.4±0.6)μg/m3,在PM2.5中占比为17.4%、3.1%。四季OC平均浓度分布为冬季(9.7±4.2)μg/m3 >春季(9.0±2.5)μg/m3 >秋季(8.3±2.9)μg/m3 >夏季(5.1±1.6)μg/m3,EC平均浓度分布为冬季(1.7±0.5)μg/m3 >春季(1.7±0.6)μg/m3 >秋季(1.3±0.4)μg/m3 >夏季(0.8±0.3)μg/m3。OC/EC范围为3.11~12.14,平均值为5.83,表明安庆市存在二次有机碳(SOC),SOC均值为(2.89±1.94)μg/m3,分别占OC和PM2.5浓度的36.1%、6.3%;四季OC、EC相关性不显著,r均小于0.85,说明安庆市的碳质组分较复杂;在不同空气质量等级条件下,OC质量浓度随着污染等级的升高而逐渐升高,EC质量浓度随着污染等级升高而先升高后降低。利用主成分分析法进行来源解析发现,道路扬尘、燃煤、柴油车尾气是碳质组分的主要来源。 |
| 英文摘要: |
| From March 2,2020 to February 28,2021,a monitoring site was set up on the roof of the Anqing Government Services Centre to collect PM2.5 manual samples.The mass concentrations of organic carbon (OC) and element carbon (EC) were analyzed by Multiwavelength Carbon Analyzer.That the pollution characteristics and possible sources of carbonaceous species in PM2.5 were analyzed based on OC/EC ratio,correlation and principal component factor analysis method.The results showed that the average mass concentrations of PM2.5 was (45.9±28.1) μg/m3,and the average concentrations of OC and EC in PM2.5 were (8.0±3.4) μg/m3 and (1.4±0.6) μg/m3,accounting for 17.4% and 3.1%,respectively.The average concentration of OC in four seasons was higher in winter (9.7±4.2) μg/m3,followed by the concentration in spring (9.0±2.5) μg/m3,in autumn (8.3±2.9) μg/m3 and in summer (5.1±1.6) μg/m3.Similarly,the concentration of EC showed same distribution pattern in four seasons,which in winter was (1.7±0.5) μg/m3,in spring was (1.7±0.6) μg/m3,in autumn was (1.3±0.4) μg/m3 and in summer was (0.8±0.3) μg/m3.The OC/EC ratios varied from 3.11-12.14,with an average value of 5.83,indicating the survive of secondary organic carbon (SOC).The average concentrations of SOC were (2.89±1.94) μg/m3,accounting for 36.1% and 6.3% in OC and PM2.5.The correlation between OC and EC was not significant (r＜0.85),which indicated that the carbon composition in Anqing was complex.Under different air quality rating,the OC mass concentration gradually increased with the increase of pollution grade,and the EC mass concentration first increased and then decreased with the increase of pollution grade.The principal component analysis showed that road dust,coal combustion and diesel car exhaust emissions were the main sources of carbon components. |
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