PM2.5 中二次有机气溶胶的组成及其对有机碳的贡献

doi:10.3969/j.issn.1007-2861.2016.01.021

摘要/Abstract

摘要：

运用气相色谱/质谱(gas chromatography-mass spectrometry, GC/MS)对浙江一中学夏季PM_2.5 样品进行了分析, 研究了各二次有机气溶胶(secondary organic aerosol, SOA)示踪物的浓度水平及SOA 形成的影响因素, 并利用示踪物产率法分析了二次有机碳(secondary organic carbon, SOC)对有机碳(organic carbon, OC)的贡献. 结果表明: 异戊二烯SOA 示踪物在总SOA 示踪物浓度中所占比重较大, 达到31.3%～52.2%, 其中2-甲基甘油酸是主要的异戊二烯SOA 示踪物; 而 -蒎烯SOA 示踪物所占比重最小, 仅占总SOA 示踪物浓度的16.4%～35.8%. 甲苯SOA 示踪物的浓度范围为6.49～12.60 ng/m³, 高于上海宝山和中国香港地区, 低于北京和广州地区. 甲苯SOC 对OC 的贡献率为11.5%～17.7%, 是SOC 的重要组成部分, 表明人为源排放是当地大气污染的重要来源. 另外, 各示踪物浓度以及总SOC 浓度都与O₃ 浓度呈显著正相关, 表明O₃ 对SOC 的形成具有重要影响.

关键词: , , PM_2.5 , 二次有机气溶胶 , 有机碳

Abstract:

PM_2.5 samples collected during summer were analyzed with gas chromatographymass spectrometry (GC/MS). The purposes were to study the concentration levels and influence factors of secondary organic aerosol (SOA) formation, and estimate the contributions of secondary organic carbon (SOC) to organic carbon (OC) using a tracer-yield method. Isoprene tracers had a large percentage of total SOA tracers, which were 31.3% to 52.2%. The dominant isoprene tracer was 2-methylglyceric acid. -pinene SOA tracers had a small percentage of total SOA tracers, which were 16.4% to 35.8%. Concentration
of toluene tracers ranged from 6.49 to 12.60 ng/m³, higher than Baoshan, Shanghai and Hong Kong, China, and lower than Beijing and Guangzhou. The contributions of SOC of toluene to OC were 11.5%～17.7% and SOC of toluene were important parts of SOC, indicating that anthropogenic emissions were important sources of air pollution. Positive correlation existed between SOA tracers and O₃, indicating that O₃ had great influence on
SOC formation.

Key words: organic carbon (OC), PM_2.5 , secondary organic aerosol (SOA)

鞠法帅, 王鑫彤, 韩德文, 汪午. PM_2.5 中二次有机气溶胶的组成及其对有机碳的贡献[J]. 上海大学学报(自然科学版), 2016, 22(2): 172-180.

JU Fashuai, WANG Xintong, HAN Dewen, WANG Wu. Composition of secondary organic aerosol and its contributions to organic carbon in PM_2.5[J]. Journal of Shanghai University（Natural Science Edition）, 2016, 22(2): 172-180.

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