摘要
为了更全面地获得城市大气中芳香烃的基础数据,借助具有强大分离、检测复杂样品能力的全二维气相色谱法（GC×GC）,于2007年国庆期间对北京交通干道大气中芳香烃进行了采样分析和初步研究.结果表明,该方法对大气中芳香烃检测范围较一维气相色谱法宽,可同时测定单环芳烃和部分多环芳烃,并能将目标芳香烃更好地分离和定量.观测期间,在北京交通干道大气中检测出30多种芳香烃,其中,单环芳烃平均浓度为0.75×10^-9～24.64×10^-9C（碳单位体积比）,甲苯浓度最高,间、对二甲苯与乙苯浓度次之;多环芳烃平均浓度为0.03×10^-9～2.28×10^-9C,萘浓度最高,2-甲基萘、4-甲基联苯浓度次之;四环以上的稠环芳烃则没有检出.芳香烃浓度变化明显受天气因素影响.高碳数芳香烃之间相关性很高,而苯、甲苯与高碳数的芳香烃相关性较差,表明两者可能受汽车尾气和汽油挥发之外的其它源的显著影响.
Comprehensive two-dimensional gas chromatography （GC x GC）is a powerful instrumental tool often used to analyze complex mixtures. An optimized GC x GC method had been applied to the quantitative analysis of aromatic compounds in air samples collected near a busy high-speed road in Beijing during the 2007 National Holidays. In the resulting GC x GC chromatograms, aromatic species were resolved from other compound classes and were grouped in a manner that facilitated identification and integration, showing more information of aromatic compounds compared to traditional one-dimensional GC. Totally more than 30 aromatic species were identified and quantified. The average concentrations of monocyclic aromatic compounds ranged from 0.75×10^-9 to 24.64× 10^-9 C, with toluene having the highest concentration, followed by m, p-xylene and ethylbenzene. The average concentrations of the measured polycyclic aromatic compounds ranged from 0.03 × 10^-9 to 2.28 ×10^-9 C, with naphthalene having the highest concentration, followed by 2-methyl-naphthalene and 4-methyl-1, 1＇-biphenyl. The four-ring and higher polycyclic aromatic compounds were not detectable in the gaseous samples. The levels of aromatic compounds were significantly influenced by meteorological parameters. Benzene and toluene were poorly correlated with higher aromatic compounds though the latter compounds were highly correlated among each other, suggesting that both were significantly influenced by sources other than vehicle exhaust and gasoline evaporation.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第10期2845-2851,共7页
Environmental Science
基金
国家自然科学基金项目(40475046)
关键词
全二维气相色谱法(GC×GC)
芳香烃
交通干道
北京市
气象因素
comprehensive two-dimensional gas chromatography （GC × GC）
aromatic compounds
high-speed road
Beijing City
meteorological parameters
