北京大气中痕量烷烃的浓度分析与研究

Analysis and Research on Trace Alkanes of Beijing Atmosphere

采用二步深冷浓缩与气相色谱质谱联用(ACIS-GC/MS)对北京大气中痕量烷烃进行长期连续观测,观测数据表明:日变化有双峰和三峰变化,冬、春呈现与交通高峰吻合的双峰变化,即:上午08:00点至10:00和下午17:00前后各出现一个高值;四季日变化中夜间22:00出现第三峰值;夏季变化呈三峰型,最大值在正午前后.季变化峰值出现在夏季,低值出现在冬季.

The concentration of trace alkanes of Beijing atmosphere was continuously observed and analyzed by Cryo Concentration System-Gas Chromatography/Mass Spectrum （CCS-GC/MS）. The diurnal, lunar and seasonal variation of concentration of C4—C13 alkanes were conducted. Diurnal variation of alkanes present three or tow peaks. In winter and spring the diurnal profiles tow peak values corresponding to the daily rush hours 08：00 to 10：00am and 17：00pm. In four season, there was the third peak value in night at 22 ： 00. The hightest concentration of alkanes in summer appeared in the midday and totally three daily maxima were in the sampled day. The concentration of alkanes in summer was the highest, while in winter were lowest.