摘要
采用二步深冷浓缩与气相色谱 /质谱联机对北京大气中的苯类物质 (BTEX)进行了长期连续观测 .最近 4年观测数据表明 :日变化有双峰和 3峰变化 ,冬、春季呈现与交通高峰期吻合的双峰变化 ,即上午 0 8:0 0至 10 :0 0和下午 17:0 0前后各出现一个高值 ;秋季日变化中 ,夜间 2 2 :0 0出现第 3峰值 ;夏季日变化呈 3峰型 ,最大峰值在正午前后 .2 0 0 0～ 2 0 0 2年BTEX月平均总浓度为 (4 4 1± 2 4 5 )nmol/mol(碳单位 ) ,季变化峰值出现在夏季 .年际变化趋势中 ,北京大气BTEX的总平均浓度从1999年到 2 0 0 2年大幅度下降 .
Atmospheric trace BTEX in Beijing was observed by a gas chromatography/mass spectrometry in the latest 4 years. The diurnal, lunar and annual concentration variations of these pollutants were reported. In winter and spring, the diurnal profiles exhibited two peak values corresponding to the daily rush hours 08:00～10:00am and 17:00pm; in autumn, there was the third peak value in the night at 22:00; the highest concentration of BTEX in summer appeared in the midday and totally three daily maxima were in the sampled day. In the lunar variation of the BTEX from 2000 to 2002,the average concentration was about (44.1±24.5) nmol/mol(C unit), and the seasonal maximum value appeared in summer. The trend of BTEX was decreased greatly from 1999 to 2002.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第3期14-18,共5页
Environmental Science
基金
国家自然科学基金资助项目 ( 4 0 2 2 2 2 0 2 )
中科院优秀博士论文基金
中科院知识创新工程重大项目 (KZCX1 SW 0 1)
