在高倍数冷场扫描电镜下对PM25样品进行了微观形貌特征分析,发现其组成以烟尘集合体及飞灰为主;并以气相色谱-质谱联用技术为检测手段,对保定市雾霾高发期内(2015年11月—2016年3月)不同污染程度下PM25样品上的有机污染物进行了定性定量分析,结果共检测到有机污染物83种,主要为正构烷烃类15种(0.02-1154.49μg·g-1)、优先监测PAHs类12种(2.36-945.17μg·g-1),其余为酞酸酯、醛、酮及苯系物等;通过PM25质量浓度、冷场扫描电镜微观形貌图像及样品上的有机污染物定性定量等测定结果的分析,对保定市城区雾霾高发期PM2.5上污染物来源进行了解析.
The micromorphology of PM2.5 was analyzed by the high magnification scanning electron microscopy (SEM).Results showed that soot aggregate and fly ash were the main pollutants.In addition,using GC-MS hyphenated techniques,12 groups of PM2.5 samples collected in Baoding city during heavy haze period (Nov.2015—Mar.2016) with different pollution levels were qualitatively and quantitatively analyzed.The results showed that 83 organic compounds were detected with 15 n-alkanes (0.02-1154.49 μg · g-1) and 12 PAHs (2.36-945.17 μg · g-1) being the major conpounds.The others were phthalate esters,aldehydes,ketones,benzene series etc.According to the mass concentration,micromorphology of PM2.5 combined with qualitative and quantitative analysis results of the organic pollutants on PM2.5 samples,the sources of pollutants on PM2.5 from Baoding city was analyzed.
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