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在燃煤源气溶胶中检测出2个相对分子质量为202的芳烃化合物,通过加氢色谱-质谱分析,结合文献数据确定为苯并苊类.对不同来源气溶胶组成研究表明,苯并苊广泛存在于城市大气气溶胶中,在桔杆、木碳及煤的燃烧产物中浓度很高,而在汽车排放气体颗粒物、降尘、环境污水、土壤及河道沉积物中含量较低或无法检出.分析了苯并苊类的可能来源其环境意义,认为苯并苊类的浓度有可能成为污染源识别及贡献率评价的重要指标.
Two aromatic hydrocarbon compounds with molecular weight of 202 were detected in coal-derived aerosols, which were identified as benzodiazepines by hydrogenation chromatography-mass spectrometry combined with literature data. Studies on the composition of aerosols from different sources showed that benzodiazepines It is widely present in urban atmospheric aerosols and has a high concentration in anthracite, charcoal and coal combustion products. However, it is low or undetectable in particulate emissions from vehicles, dust, environmental effluents, soil and river sediments The environmental significance of the possible sources of benzodiazepines is analyzed, and it is concluded that the concentration of benzodiazepines may become an important index for the identification and contribution rate of pollution sources.