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区域环境与生态

王娟,钟宁宁,栾媛,覃向荣,于国光,王玮,王铁冠.鄂尔多斯市秋季大气PM_2.5、PM₁₀颗粒物中正构烷烃的组成分布与来源特征[J].环境科学学报,2007,27(11):1915-1923

Chemical composition and emission source of n-alkanes in ambient PM₁₀ and PM_2.5 in autumn in Ordos

摘要：利用气相色谱-质谱技术分析了秋季鄂尔多斯市居民区、工业区和清洁区5个采样点大气PM_2.5、PM₁₀颗粒物中正构烷烃组分,运用Cmax、CPI、Cn(wax)分子地球化学参数对污染源进行了初步示踪研究,并对污染程度进行了判断.结果表明,鄂尔多斯市秋季大气PM_2.5、PM₁₀颗粒物上正构烷烃来源相对比较复杂,各功能区均不同程度的受到人为来源正构烷烃污染的影响.总体来说,工业区和居民区人为来源正构烷烃污染较重,这两个功能区污

Abstract：The n-alkanes in PM_2.5, PM₁₀ airborne particles in autumn at five sampling sites in Ordos, of Inner Mongolia were determined by gas chromatography-mass spectrometry. Molecular geochemical parameters such as Cmax、CPI、Cn(wax)were used to preliminarily identify the pollutant sources and to determine the n-alkanes pollution conditions in one residential area, two industrial areas and two clean areas. The results suggested that the pollutant source of n-alkanes of PM_2.5, PM₁₀ airborne particles in autumn over Ordos was complex, and the airborne particles in each functional area were polluted to different extents. In general, the n-alkanes pollution in residential and industrial areas which had the same pollution conditions was more serious than that of clean areas. In Ordos, the meteorological factors, especially the wind direction, had a strong influence on the pollution condition of n-alkanes components. The n-alkanes in PM_2.5, PM₁₀ airborne particles over urban areas mainly came from anthropogenic sources, which were also supported by other studies.