宋锴,俞颖,陆思华,唐荣志,胡敏,郭松.珠海市秋季大气挥发性有机物变化趋势和大气化学反应活性[J].环境科学学报,2020,40(7):2323-2332
珠海市秋季大气挥发性有机物变化趋势和大气化学反应活性
- Variation and reactivity of ambient volatile organic compounds (VOCs) in autumn of Zhuhai
- 基金项目：国家重点研发计划（No.2016YFC0202003）；国家自然科学基金委项目（No.41977179，21677002，91844301）
- 宋锴
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 俞颖
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 陆思华
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 唐荣志
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 胡敏
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 郭松
- 1. 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871;2. 江苏省大气环境与装备技术协同创新中心, 南京信息工程大学, 南京 210044
- 摘要：为探究珠海市大气挥发性有机物（VOCs）的来源和影响，制定有效的臭氧控制政策，本研究利用在线气相色谱-质谱仪/火焰离子检测器（Online-GC-MS/FID）于2016年9-10月对珠海市大气中96种VOCs进行了测量，并分析了珠海市大气VOCs的组成特征、日变化趋势、来源及其对臭氧生成的贡献.研究结果表明：珠海市大气VOCs中烷烃的体积混合比最高，其次为芳香烃；烷烃、芳香烃日变化趋势明显，具有双峰特征；珠海市大气中丙烷、异戊二烯和芳香烃分别来自于液化石油气（LPG）、天然源和工业排放.通过反向轨迹分析发现，来自珠三角内陆地区的气团传输对珠海VOCs污染具有重要贡献，其对臭氧生成潜势（OFP）的影响主要来自芳香烃.VOCs活性分析表明，芳香烃和烷烃是珠海市OFP的最主要贡献者，其中甲苯、间/对二甲苯和乙烯是对OFP贡献最大的物种，因此控制人为源VOCs排放是未来珠海市臭氧污染控制的重点.
- Abstract：To investigate the sources and influences of ambient volatile organic compounds (VOCs) in Zhuhai, as well as to establish effective ozone control measures, 96 kinds of VOCs were measured by using online Gas Chromatography Mass Spectrometer/Flame Ionization Detector (GC-MS/FID) at a regional site of Zhuhai from September to October 2016. The VOCs mixing ratios, diurnal variations, sources, and ozone formation potential were analyzed. Alkanes were the most abundant compounds, followed by aromatics. Alkanes and aromatics showed obvious bi-modal diurnal variation. The correlation analysis indicates that propane was mainly from liquid petrol gas (LPG) usage. Isoprene was from biogenic sources. The aromatics were mainly from industrial emissions. Back trajectory analysis showed that the VOCs concentrations were high when the air mass was from inland Pearl River Delta (PRD) region. The ozone formation potential (OFP) from different VOCs was calculated. Aromatics and alkanes contributed large OFP in Zhuhai. Toluene, m/p-xylene and ethene were the top 3 species that contributed to ozone formation. As a result, reducing anthropogenic VOCs emission will be an important measure to control the ozone pollution in Zhuhai.
