2004年国庆假期北京大气挥发性有机物浓度监测及气象条件对其浓度变化影响研究

2004年国庆期间对北京大气中挥发性有机物每2h采一次样，利用浓缩进样和GC—MS分析技术对样品中浓度较大的苯等7种典型物质进行了定性定量分析和日平均浓度讨沦；以甲苯为例重点分析了不同气象因素对其国庆节期间浓度逐日变化形式的影响，结果表明甲苯浓度与气压、辐射、风速、降雨等气象条件负相关，温度、风向也对甲苯浓度有一定影响。

A Case Study of VOCs Concentrations and Their Variability Caused by Meteorological Parameters in Beijing During the 2004 National Holidays

Volatile organic compounds(VOCs) were collected every two hours in Beijing during the 2004 National Holidays.They were cryo-concentrated prior to analysis by GC-MS.Seven compounds were determined in the samples and the results were used to derive daily average concentrations.The concentration of toluene was the highest among those of the seven compounds and the concentration of butene was the lowest.The effect of different meteorological parameters on the diurnal variation of VOCs such as toluene was also discussed in detail.The result shows that pressure,radiation,wind speed,and rainfall had negative correlations with the concentration of toluene.Temperature and wind direction also affected the concentration of toluene.