摘要
在东北地区7个典型城市中25个监测点进行了观测,时间分别为2008年4月、7月、10月和2009年1月,使用吸附剂采样管采集并通过热脱附-气相色谱-质谱联用技术分析了苯系物样品,系统研究了东北地区大气苯系物的时空分布特征。研究结果表明,苯和甲苯年均浓度值最高,分别为(4.19±2.31)μg/m3和(3.22±1.14)μg/m3,共占苯系物浓度近70%;各功能区按苯系物浓度大小顺序排列为混合区>工业区>交通区>居民区>文教区>对照区;受排放源和气象条件的影响,采暖期苯系物浓度高于非采暖期苯系物浓度;风向频率影响苯系物浓度分布,沿下风向浓度逐渐降低;苯/甲苯比值分析表明,东北地区苯系物的主要来源是煤燃烧。
The study was conducted in 25 sampling sites in 7 typical cities in Northeast China in April, July and October in 2008 and January in 2009, and the adsorbent tube followed by thermal desorption-gas chromatography-mass selective detector （TD-GC- MSD） technique were selected to sampling and analyze. Based on the analysis results, the spatial distribution and temporal variation of BTEX in the ambient air of Northeast China was studied. The results demonstrate that the concentration of benzene and toluene [ （4. 19±2.31 ） μg/m^3 and （3.22± 1.14） μg/m^3 , respectively] was highest in BTEX, which accounts for 70%. The rank order of the concentration of BTEX of functional zones is mixing zone 〉 industrial zone 〉 traffic zone 〉 residential area 〉 cultural and educationM area 〉 clear area. The concentration of BTEX in heating period is higher than that of non-heatlng period, which attributed to the emission source and meteorological condition. The wind direction frequency influences the BTEX concentration distribution, resulting in the decreasing of the concentration of BTEX to the leeward side. The analyses of the ratio of benzene to toluene shows that the main resource of BTEX in Northeast China was coal burning rather than vehicle exhaust.
出处
《中国环境监测》
CAS
CSCD
北大核心
2013年第1期1-7,共7页
Environmental Monitoring in China
基金
国家环境保护公益性行业科研专项项目(200709013)
关键词
东北地区
苯系物
时空分布
风向频率
Northeast China
BTEX
spatial distribution and temporal variation
wind direction frequency
