珠三角地区大气中HCFC-22的浓度观测和变化趋势初步研究  

Preliminary investigation on levels and trends oatmospheric chlorodifuoromethane (HCFC-22) in the Pearl River Delta

作　　者：张芳[1] 王新明[1] 易志刚[1] 李龙凤[1] 陈尊裕[2] 陈鲁言[2] Donald R.Blake 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室 [2]香港理工大学土木与结构工程学系 [3]加州大学Irvine分校化学系

出　　处：《环境科学学报》2006年第6期987-991,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(40203011);科技部"973"项目(2002CB810403);科学院重要方向性项目(KZCX3SW121)~~

摘　　要：通过罐采样和预浓缩色谱/质谱方法,对珠三角地区广州城区和鼎湖山大气中HCFC22进行了初步的观测和分析.结果表明,2005年广州城区HCFC22年平均体积分数达到(479.5±241.4)×10-12,鼎湖山仅为(244.4±51.3)×10-12.广州城区大气HCFC22日变化幅度夏秋季节相对较大,而鼎湖山日变化不明显;广州城区大气HCFC22的体积分数夏秋季节高于冬春季节,鼎湖山则相反.与城区HCFC22排放的季节性有关,夏秋季节广州城区与鼎湖山HCFC22体积分数差别很大,冬春季节则比较接近.初步研究结果表明,广州城区和鼎湖山大气HCFC22的体积分数呈现快速增长趋势,年增长率分别达到6.57%和7.28%,约为一些全球基准观测站(NOAA/CMDL)的1.9～2.8倍.Atmospheric HCFC-22 was preliminarily measured in urban Gangzhou and Dinghu Mountain in the Pearl River Delta region by canister sampling followed by pre -concentration and GC/MS analysis. The mixing ratios of atmospheric HCFC-22 were found to be as high as （479.5 ± 241.4）×10^-12in urban Guangzhou in 2005, but only （244.4±51.3 ）×10^-12 in Dinghu Mountain. The diurnal variation of HCFC-22 in urban Guangzhou was much more evident in summer and autumn, but in Dinghu Mountain the diurnal variation was not significant in the whole year. The concentration of HCFC-22 was much higher in summer and autumn than in winter and spring in urban district of Guangzhou, whereas in Dinghu Mountain the seasonal changes were the opposite. Due to the seasonality of HCFC-22 emission in urban areas, in summer and autumn the levels of HCFC-22 were much higher in urban district of Guangzhou than in Dinghu Mountain, but in winter and spring they were close to each other. Preliminary results revealed rapid growth rates of HCFC-22 in urban district of Guangzhou and Dinghu Mountain. The average annual growth rate of HCFC-22, which were 6.57% in Dinghu Mountain and 7.28% in Guangzhou, which were about 1.9 ～ 2.8 times of the annum growth rates observed in global background stations （ NOAA/ ESRL）.

关 键 词：HCFC-22 珠江三角洲 日变化 季节变化 增长率 

分 类 号：X511[环境科学与工程—环境工程]