机场周边大气中非甲烷总烃时空分布特征

为了研究机场周边大气中非甲烷烃的污染情况,于2011年4月21日起连续5天对某机场起降点附近2个采样点以及对照点农田区的大气中NMHCs进行测定.结果表明,NMHCs的含量为飞机开始滑行点（3.22mg/m3）＞降落点（2.92mg/m3）＞农田区（2.91 mg/m3）,均超出以色列的标准（2.0mg/m3）.非甲烷总烃在一天中下午16点达到最小值.飞机的起降对周边大气NMHCs排放有一定的影响.而对照点农田排放可能是当地NMHCs排放的重要来源. 3个采样点中,排放的碳氢化合物以非甲烷烃为主,占总烃的63.4％.NMHCs和总烃的线性关系良好,用统计回归的方法得到了研究区总烃和非甲烷烃的换算公式.

Study on Special and Temporal Characteristics of NMHCs in Regional Atmosphere of an Airport

In order to study the surrounding atmospheric pollution caused by airport operation, atmospheric non-methane hydrocarbons （NMHCs） of two sampling sites near landing area of an airport and the control site near farmland zone were detected continuously from April 21th to 25th 2011. The results showed that daily average NMHC3 concentration of Farmland, slide point and the landing point were 2.91mg/m3, 2. 92mg/m3 and 3.22mg/m3 respectively, which all exceeded the emission standard of Israel （2. 0mg/m3 ）. The concentration of NMHCs reached the minimum level around 16：00 pm at one day. Above result indicated that the aircraft movements have certain influence on surrounding atmospheric concentration of non-methane hydrocarbon. Plant emission of farmland is an important source of local NMHCs emission. NMHC were the mainly hydrocarbon emitted which accounted for 63.4% of THC. Moreover, there is a good linear relationship between THC and NMHCs. The conversion formula between THC and NMHC was given by using statistical regression analysis.