• 关键词：PM_2.5  正构烷烃  污染特征  来源分析

• 基金项目：国家自然科学基金青年科学基金项目(No.41403089);国家环境保护大气复合污染来源与控制重点实验室开放基金(No.SCAPC201310);中国科学院重点部署项目(No.KJZD-EW-TZ-G06-04)

• 向丽
• 1. 重庆工商大学, 重庆 400067;2. 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714

• 田密
• 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714

• 杨季冬
• 1. 重庆工商大学, 重庆 400067;2. 重庆三峡学院, 三峡库区水环境演变与污染防治重点实验室, 万州 404100

• 陈阳
• 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714

• 杨复沫
• 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714

• 摘要：采用大流量气溶胶采样器采集了重庆市万州城区2013年夏季和冬季大气中PM_2.5样品,并运用气相色谱-质谱联用技术对PM_2.5中22种(C₁₂~C₃₃)正构烷烃的含量进行了测定,进而对万州城区PM_2.5中正构烷烃的污染特征及来源进行了分析.结果表明,万州城区夏、冬季大气PM_2.5中均检测出C₁₂~C₃₃正构烷烃,主峰碳均为C₂₉和C₃₁.夏、冬季PM_2.5中正构烷烃日均总浓度分别为158.70ng·m^-3和257.20ng·m^-3,碳优势指数CPI分别为1.63和1.82,CPI1分别为0.61和0.67,CPI2分别为1.83和1.96,植物蜡参数WaxC平均值分别为53.44%和55.53%.万州城区大气细颗粒物中n-alkanes受到来源于陆源高等植物蜡的排放等生物源及化石燃料燃烧等人为源的共同影响,且生物源的影响较大.

• Abstract：PM_2.5 filter samples were collected with high-volume sampler during summer and winter of 2013 in Wanzhou, Chongqing. The mass concentrations of n-alkanes from C₁₂ to C₃₃ in PM_2.5 were determined via GC-MS. The main peaks of n-alkanes had carbon numbers of 29 and 31 in both summer and winter. In summer, the daily average concentration of total n-alkanes was 158.70 ng·m^-3. The Carbon Preference Index (CPI), CPI1 and CPI2 was 1.63, 0.61, and 1.83, respectively, with the averaged WaxC value of 53.44%.While in winter, the daily average concentration of total n-alkanes was 257.20 ng·m^-3, CPI of 1.82, CPI1 of 0.67, CPI2 of 1.96, and average WaxC of 55.53%.These results indicated that n-alkanes in PM_2.5 during summer and winter in Wanzhou were mainly from higher plant wax and the incomplete combustion of fossil fuels. Higher plant wax, as a type of biogenic source, had stronger impact.

• Key words：PM_2.5  n-alkanes  pollution characteristic  source apportionment

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