摘要
采用经过改进的装配有氢火焰离子化检测器(FID)的气相色谱仪(GC),配合自动进样、分析和标定系统,以10min一次的采样频率,于2007年7月—9月,在中国科学院大气物理研究所铁塔分部连续采样,监测北京大气CO浓度变化..结果表明,北京城市大气CO浓度日变化呈双峰型,两峰值出现的时间分别为7∶00—8∶00和23∶00—24∶00,浓度分别达3.66×10-6V/V和4.92×10-6V/V.北京大气CO的浓度变化受源排放强度和气象要素共同影响.机动车限行,对降低大气CO的浓度效果明显,但天气过程对CO的清除作用也不可忽视.
Continuous monitoring of CO concentration in Beijing was made between July 1st and September 30th, 2007. An improved gas chromatograph （GC） equipped with a flame ionization detector （FID） was used for the measurement, combining with automated sampling and calibrating systems. The results show that there are two peaks in the diurnal variation of CO in the atmosphere of Beijing, one appears at 7： 00--8：00 in the morning, the other is at 23：00--24：00 in the evening, the concentration for the two peaks are 3.66 × 10^-6 V/V and 4.92 × 10^-6V/V, respectively. The variation of CO concentration is strongly affected by both the strength of emission sources and the key meteorological factors. Although CO concentration in the atmosphere decreased significantly during the traffic restriction period of August 17--20 of 2007, the weather condition also played a role in air pollutant elimination.
出处
《环境化学》
CAS
CSCD
北大核心
2009年第4期567-570,共4页
Environmental Chemistry
基金
国家重点基础研究发展计划(973计划)(2007CB407303)
国家高技术研究发展计划(863)项目(2006AA06A301)
中国科学院知识创新重大工程项目(KZCX1-YW-06-01)
关键词
CO
GC
FID
日变化
气象因子
机动车限行
CO, GC, FID, diurnal variation, meteorological factor, automobile restriction period.
