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研究报告

基金项目：国家自然科学基金项目（No.21377078，41675123）；金华市科技局项目（No.2013-3-001）；金华市环保局项目（No.YG2014-FW673-ZFCG046）

摘要：用GC/MS，对金华地区3个采样点、四个季节，225个PM_2.5样品中10种极性有机示踪化合物进行了分析，包括天然源：3个异戊二烯SOA示踪物、1个α-蒎烯SOA示踪物和2个真菌孢子示踪物，和人为源：1个甲苯SOA示踪物、3个生物质燃烧示踪物.结果表明，异戊二烯SOA示踪物浓度为3.41~48.50 ng·m^-3，α-蒎烯SOA示踪物浓度为2.45~25.40 ng·m^-3，甲苯SOA示踪物为4.75~39.80 ng·m^-3.各SOA示踪物均有明显的季节变化，其中，异戊二烯SOA示踪物呈夏季>秋季≈春季>冬季，α-蒎烯SOA示踪物夏季>春季≈秋季>冬季，甲苯SOA示踪物秋季>夏季>春季>冬季.估算得出甲苯SOC对OC的贡献为3.03%~24.50%，而来源于生物质燃烧的有机碳对OC的贡献可以达到1.23%~42.80%.表明人为源排放前体物的二次转化以及生物质燃烧是金华地区大气细颗粒物污染的重要来源.

Abstract：Two hundred and twenty five PM_2.5 samples were collected in four seasons at three sites in Jinhua, and were analyzed with gas chromatography/mass spectrometry (GC/MS). Ten polar organic tracers were identified and quantified, including five tracers of secondary organic aerosols (SOA), i.e. three for isoprene, one for α-pinene and one for toluene, and five tracers of primary organic aerosols (POA), i.e. two for fungal spores and three for biomass burning. The concentrations of the SOA tracers for isoprene, α-pinene and toluene were 3.41~48.50, 2.45~25.40 and 4.75~39.80 ng·m^-3, respectively. Seasonal variations of concentrations of isoprene SOA tracers for isoprene and α-pinene were summer > autumn ≈ spring > winter, while autumn > summer > spring > winter for the toluene SOA tracer. It was estimated that 3.03%~24.50% of OC was contributed by SOA from toluene and 1.23%~42.80% of OC was from biomass burning, indicating that SOA from anthropogenic emissions and biomass burning were two important sources of fine particles in Jinhua.