基于城市大气挥发性有机物特征分析的数据质量评估方法及案例  

Evaluation of Ambient Volatile Organic Compounds Measurement Data Based on Internal Consistency Test

作　　者：王鸣[1,2] 陆思华 陈文泰[4] 邵敏 卢兴东[1,4] WANG Ming;LU Sihua;CHEN Wentai;SHAO Min;LU Xingdong(School of Environment Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET) ,Nanjing 210044 ,China;College of Environmental Sciences and Engineering,Peking University ,Beijing 100871 ,China;Jinan University Institute for Environmental and Climate Change,Guangzhou 510632 ,China;Nanjing Intelligent Environmental Science and Technology Co,Ltd ,Nanjing 211800,China)

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏南京210044 [2]江苏省大气环境与装备技术协同创新中心,江苏南京210044 [3]北京大学环境科学与工程学院,北京100871 [4]南京科略环境科技有限责任公司,江苏南京211800 [5]暨南大学环境与气候研究院,广东广州510632

出　　处：《中国环境监测》2019年第2期13-22,共10页Environmental Monitoring in China

基　　金：国家自然科学基金资助项目(41505113);江苏省自然科学基金资助项目(BK20150896;BK20151041);上海市科学技术委员会科研计划项目(16DZ1204606)

摘　　要：城市大气挥发性有机物(VOCs)监测是空气质量监测网的重要组成部分,而数据质量控制和质量保证是VOCs监测的基础。基于8次中国城市大气VOCs外场监测,通过挖掘VOCs浓度、组成和化学活性的内在规律,对VOCs监测数据质量进行评估并总结方法。分析结果显示:城市大气乙烷和苯等长寿命组分具有明显的背景浓度,且区域背景值较为接近,可以用来诊断长寿命VOCs组分浓度异常偏低或偏高现象。而示踪组分的季节(日)变化规律可以用来识别VOCs组分定性问题(如夏季大气异戊二烯和烷基硝酸酯浓度日变化规律应反映植被排放和光化学反应特征)。另外,在气团混合均匀的情况下,VOCs浓度波动与其活性之间存在负相关,这一规律可以用来核查数据准确性或局地源影响。Measurement of ambient VOCs in urban atmosphere is an important part of the air quality monitoring network,and data quality control and quality assurance is the basis of VOCs monitoring. Based on 8 ambient VOCs measurements in China,the quality of VOCs data was evaluated using internal consistency test on VOCs mixing ratios,chemical composition,and reactivity. Results showed that long-lived VOCs species ethane and benzene exhibited similar regional background concentration,which can be used to diagnose abnormal low mixing ratios of long-lived VOCs. The seasonal/diurnal variation of tracers can be used to identify qualitative problems of VOCs components. For example,the diurnal variations of ambient isoprene and alkyl nitrates in summer should reflect the characteristics of biogenic emissions and photochemical reactions,respectively. In addition,a negative correlation between fluctuation of VOCs mixing ratios and their reactivity were found for well-mixed air masses,which can be used to check VOCs data quality or influences of local sources.

关 键 词：挥发性有机物 质量评估 统计分析 比值 活性 

分 类 号：X831.05[环境科学与工程—环境工程]