• 关键词：福州  挥发性有机物  臭氧生成潜势  化学反应活性

• 基金项目：福建省环保科技计划项目(No.2013R003)

• 钟雪芬
• 福建师范大学环境科学与工程学院, 福州 350007

• 陈峰
• 福建省福州市环境监测站, 福州 350000

• 丁晖
• 福建省福州市环境监测站, 福州 350000

• 陈金水
• 福建省福州市环境监测站, 福州 350000

• 卢登峰
• 福建省福州市环境监测站, 福州 350000

• 许丽忠
• 福建师范大学环境科学与工程学院, 福州 350007

• 摘要：挥发性有机物(VOCs)的臭氧生成潜势引起广泛关注.2014年夏季和秋季对福州清洁地区鼓山挥发性有机物浓度特征及化学反应活性进行监测研究.鼓山夏季总挥发性有机物平均浓度为(262.57±256.71)μg·m^-3,低于秋季(330.74±254.38)μg·m^-3.两季平均VOCs浓度组成为烷烃(115.37±20.99)μg·m^-3,含氧化硫烃(66.54±2.10)μg·m^-3,卤代烃(63.17±13.96)μg·m^-3,烯烃(34.20±5.50)μg·m^-3,芳香烃(17.38±5.65)μg·m^-3.VOCs浓度日变化趋势表现出明显的季节特征.通过比较VOCs各物种的化学反应活性,发现鼓山站点两季中烯烃类浓度远低于烷烃,但其具有最大臭氧生成潜势,约为烷烃的3倍,其次是烷烃和芳香烃.此外,异戊二烯对臭氧生成的贡献亦大.对优势物种进行分析,并选取间/对-二甲苯和乙苯环境浓度的比值作为评价气团老化程度的指标,结果表明:鼓山VOCs主要来源于交通源,夏季主要来自于大气的远程输送,而秋季受局地交通排放源影响较大.

• Abstract：The increased concentrations of volatile organic compounds (VOCs) have caused widespread concern. VOCs concentrations at Gushan site, a clean area in Fuzhou, were monitored and their chemical reactivity were studied during the summer and autumn in 2014. The average concentration of total volatile organic compounds in summer in Gushan site was (262.57±256.71) μg·m^-3, lower than the concentration in fall of (330.74±254.38) μg·m^-3.The averaged concentrations of VOCs in the two seasons were alkanes (115.37±20.99)μg·m^-3, sulfur or oxygen-containing hydrocarbon (66.54±2.10) μg·m^-3, halogenated hydrocarbon (63.17±13.96)μg·m^-3, alkenes (34.20±5.50) μg·m^-3, and aromatics hydrocarbon (17.3±5.65) μg·m^-3. Significant seasonal difference existed in diurnal variation of VOCs concentrations. Although the concentrations of alkenes were much lower than those of alkanes in both summer and autumn, alkenes showed the highest ozone production potential, followed by alkanes and aromatic hydrocarbons. Isoprene also made great contribution to ozone formation. We also analyzed the dominant species, and selected the ratio of M/P-xylene to ethylbenzene concentration as the index of the age of air mass. The main source of VOCs in Gushan site was transportation. In the summer, VOCs were mainly from long-range transport, while in autumn it was greatly influenced by local emission.

• Key words：Fuzhou  volatile organic compounds  ozone formation potential  chemical reaction activity

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