分析化学2025，Vol.53Issue(10)：1714-1721,中插45-中插53,17.DOI:10.19756/j.issn.0253-3820.251060
典型工业城市夏季大气挥发性有机化合物的区域差异及来源解析
Regional Differences and Source Apportionment of Atmospheric Volatile Organic Compounds in A Typical Industrial City During Summer
摘要
Abstract
A method for determining volatile organic compounds(VOCs)in environmental air samples using thermal desorption-gas chromatography/mass spectrometry(TD-GC/MS)was developed.The qualitative and quantitative analyses of 103 kinds of VOC species were achieved under the optimal conditions such as cold trap desorption temperature and time during the thermal desorption process,combined with full-scan data acquisition using an electron impact ionization source.With a sampling volume of 3.0 L,the method exhibited detection limits of 0.1-0.5 μg/m3 and quantitation limits of 0.4-2.0 μg/m3.At spiked concentrations of 1.0 μg/m3 and 10.0 μg/m3,the recoveries ranged from 60.5%to 118.0%,with relative standard deviations varying from 2.37%to 18.70%.Furthermore,all target compounds showed correlation coefficients(R²)exceeding 0.997 across their respective concentration ranges,demonstrating that the method had high accuracy and reliability.Using this method,a study was conducted to investigate the spatial variations and source apportionment of VOCs across urban,suburban,and rural sites in Anyang,a representative industrial city,during the summer season.The results revealed significant differences in VOC concentrations among the three regions.The urban site recorded the highest concentration at 40.1 μg/m3,followed by the rural site at 23.5 μg/m3,while the suburban site had the lowest concentration of 9.74 μg/m³.With regard to compositional characteristics,alkanes were the dominant components in the urban and rural areas,whereas oxygenated VOCs were predominant in the suburban site.The ozone formation potential(OFP)also varied significantly across regions:96.0 μg/m3 in urban areas,72.0 μg/m3 in rural areas,and only 27.6 μg/m3 in suburban areas.Alkenes were identified as the primary contributors to the total ozone formation potential(TOFP)in all regions,highlighting their critical role in atmospheric oxidation processes.Source apportionment analysis using the positive matrix factorization(PMF)model identified combustion sources,natural sources,chemical industry emissions,industrial emissions,solvent use,and vehicle emissions as the major sources of VOCs in Anyang during summer.Notably,chemical industry emissions and combustion sources were dominant in urban and rural areas,whereas combustion sources and natural sources were more prominent in the suburban area,reflecting distinct emission patterns and anthropogenic activities across the regions.关键词
热脱附-气相色谱/质谱法/挥发性有机污染物/区域差异/臭氧生成潜势/来源解析Key words
Thermal desorption-gas chromatography/mass spectrometry/Volatile organic compounds/Regional differences/Ozone formation potential/Source apportionment引用本文复制引用
任玉婷,杨利娟,刘扬扬,徐敏,王美..典型工业城市夏季大气挥发性有机化合物的区域差异及来源解析[J].分析化学,2025,53(10):1714-1721,中插45-中插53,17.基金项目
河北省自然科学基金项目(No.B2024201033)资助. Supported by the Natural Science Foundation of Hebei Province(No.B2024201033). （No.B2024201033）
