北京城区大气中有机溴污染物的分析

Analysis on the Organic Bromine in the Atmosphere in Beijing

摘要: 利用仪器中子活化(INAA)法分析了2004年4月至12月间北京城区大气中气态与总悬浮颗粒物(TSP)样品中可萃取有机溴污染物(EOBr)和持久性可萃取有机溴污染物(EPOBr)的浓度。结果表明,采样期间城区大气中气态EOBr平均浓度为6.2 ng/m3(1.0~18.5 ng/m3),EPOBr平均浓度为0.95 ng/m3(0.02~2.2 ng/m3);TSP中EOBr和EPOBr的平均浓度分别为18.3 ng/m3(2.3~73.4 ng/m3)和1.0 ng/m3(0.09~3.0 ng/m3);气态和TSP中EPOBr分别占EOBr的15.3%(1.9%~62.8%)和5.5%(0.8%~55.6%)。可见大气中的有机溴污染物绝大多数为酸溶或酸不稳定的化合物。。

Abstract: Gaseous and particulate phase samples are simultaneously collected at a downtown site in Beijing from April 2004 to December 2004 using a modified high-volume air sampler and determined by in strumental neutron activation analysis(INAA) for the concentrations of extractable organic-bromine(EOBr) and extractable persistent organic-bromine(EPOBr).Results show that the average concentrations of EOBr are 6.2 ng/m~3(1.0~18.5 ng/m~3) and 18.3 ng/m~3(2.3~73.4 ng/m~3) in gaseous and particulate phase,respectively;the average concentrations of EPOBr are 0.95 ng/m~3(0.02~2.2 ng/m~3) and 1.0 ng/m~3(0.09~3.0 ng/m~3) in gaseous and particulate phase;EPOBr accounts for(15.3%)(1.9%~62.8%)in gaseous phase and 5.5%(0.8%~55.6%) in TSP of total EOBr.