• 关键词：VOCs  罐采样  后向轨迹  季节特征  臭氧生成潜势

• 基金项目：江苏省环境监测科研基金项目（No.1814）；国家重点研发计划（No.2016YFA0602003）

• 王伶瑞
• 南京信息工程大学大气物理学院, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044

• 李海燕
• 江苏省连云港环境监测中心, 连云港 222001

• 陈程
• 江苏省连云港环境监测中心, 连云港 222001

• 郑珊珊
• 南京信息工程大学大气物理学院, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044

• 许潇锋
• 南京信息工程大学大气物理学院, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044

• 汤莉莉
• 南京信息工程大学环境科学与工程学院, 南京 210044

• 摘要：于2018年4—9月在连云港市不同功能区进行了VOCs苏玛罐采样，分析了57种PAMS物种和15种醛酮化合物.结果表明，工业区VOCs浓度最高（54.51 μg·m^-3），其次是城区（52.59 μg·m^-3），郊区浓度最低（43.98 μg·m^-3）.不同功能区的VOCs组分占比类似，都为醛酮（39.29%~45.94%） > 烷烃（27.61%~33.15%） > 芳香烃（15.99%~20.25%） > 烯烃（6.49%~7.39%） > 乙炔（0.55%~0.85%）.连云港市PAMS组分浓度与我国其他城市相比明显处于较低水平，季节变化趋势在连云港市城区和郊区基本一致，各组分浓度水平则是城区和工业区较为接近，明显高于郊区.醛酮类化合物中含量最高的为丙酮和2-丁酮，与我国其他城市和乡村地区相比也处在较高水平，季节变化趋势在连云港市所有功能区均呈现春季最高，秋季最低，夏季居中的情况.采用MIR系数计算VOCs的臭氧生成潜势（OFP），不同功能区对臭氧生成贡献最大的都是芳香烃（39.18%~46.63%），醛酮（23.90%~29.89%）其次.OFP排名前十物种表明，在连云港市控制正己烷、甲苯、二甲苯、三甲苯等芳香烃和丙酮、2-丁酮，可以有效控制O₃生成.甲苯/苯比值在2左右表明连云港市交通源对大气VOCs贡献显著，由异戊烷/TVOCs比值可知城区和郊区汽油挥发源贡献明显大于工业区，甲醛/乙醛比值在1左右表明连云港市不同功能区大气都符合城市地区的特征，从苯/甲苯与二甲苯/苯比值散点图发现连云港市大气老化特征明显.

• Abstract：A six-month campaign for volatile organic compound (VOC) measurement at different areas in Lianyungang was conducted from Apr to Sep in 2018. 57 Photochemical Assessment Monitoring Station (PAMS) and 15 carbonyl species were analyzed. The results showed that the mean concentrations of VOCs were highest in the industrial area (54.51 μg·m^-3), followed by the urban (52.59 μg·m^-3) and the suburban area (43.98 μg·m^-3). The proportions of VOC components at different functional areas were similar, and all showed carbonyls (39.29%~45.94%)> alkanes (27.61%~33.15%)> aromatics (15.99%~20.25%)> alkenes (6.49%~7.39%)> acetylene (0.55%~0.85%). The concentrations of PAMS species in Lianyungang City were notably lower than those in other cities in China. The seasonal variation of PAMS species in Lianyungang was approximately the same in the urban and suburban areas. While the concentrations of different components were at similar levels in the urban and industrial areas, they were all significantly higher than those in the suburban area. Acetone and 2-butanone, which were the most abundant species of carbonyls in Lianyungang, showed a higher level than in other cities and rural areas in China. The seasonal variation of carbonyls was the same in all functional areas in Lianyungang and highest in spring and lowest in autumn. According to the maximum incremental reactivity (MIR) method, the most important VOC group for the ozone formation potential (OFP) was the aromatics (39.18%~46.63%) and then the carbonyls (23.90%~29.89%). The OFP analysis on the top ten species suggested that the mitigation on n-hexane, toluene, xylene, trimethylbenzene, acetone and 2-butanone should be an effective measure in controlling O₃ formation in Lianyungang. The ratio of toluene/benzene at ~ 2, indicated that the traffic source of VOCs may dominate in Lianyungang. The isopentane/TVOCs ratio implied that the gasoline vaporization sources in urban and suburban areas may contribute more than that in industrial areas. The formaldehyde/acetaldehyde ratio at ~ 1 suggested that the VOCs in Lianyungang represent the general features of VOCs for a typical urban environment. The ratios of benzene/toluene and xylene/benzene indicated that airmass in Lianyungang had significant aging effect.

• Key words：VOCs  SUMMA canister sampling  backward trajectory  seasonal characteristics  ozone formation potential

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