大气多环芳烃在流通式采样器中的穿透行为研究  

Breakthrough behavior of atmospheric polycyclic aromatic hydrocarbons in flow-through sampler

作　　者：黄仲文[1,2,3] 黄岑彦 彭成辉 唐剑锋 佟磊 肖航[1,3] 

机构地区：[1]中国科学院城市环境研究所,福建厦门361021 [2]中国科学院大学,北京100049 [3]中国科学院宁波城市环境观测研究站,浙江宁波315800

出　　处：《环境污染与防治》2017年第11期1193-1199,共7页Environmental Pollution & Control

基　　金：国家自然科学基金青年基金资助项目(No.31300435);福建省科技计划项目(No.2013H0055)

摘　　要：采用主动采样器连接流通式采样器(FTS)采样管,分别于2015年1月和9月采集了4组样品,利用气相色谱—质谱联用仪测定了美国环境保护署优先控制的15种多环芳烃(PAHs),并对其在FTS采样吸附柱中的穿透行为进行了研究。结果表明,PAHs在采样吸附柱中的穿透行为因挥发性不同而差异明显,并受到风速和温度的影响。logP_L(P_L为过冷液体蒸汽压,Pa)为-5^-2的PAHs的流失率约为5%,并与风速呈正相关关系,对该类PAHs流失率的校正并非必要。logP_L>-2的PAHs基本存在于气相,其流失率与logP_L和风速均呈正相关关系,这类PAHs使用流失率进行定量校正后,浓度增加最高可达77.2%。logP_L<-5的PAHs基本存在于颗粒相,被FTS采样吸附柱捕获采集可能有一定随机性,不适合使用流失率进行校正。此外,FTS在相似环境条件和采样量下采集高挥发性PAHS得出的流失率可供主动采样器进行校正参考,这对于高挥发性PAHs的准确定量采样具有重要意义。4 groups of samples were collected by active sampler with sampling tube of flow-through sampler （FTS） ,in January and Septernber,2015. 15 priority polycyclic aromatic hydrocarbons （PAHs） controlled by United States Environmental Protection Agency （USEPA） in these samples were quantitatively analyzed using chromatogra- phy-mass spectrometry （GC-MS）. The breakthrough behavior of PAHs on the absorbing column of FTS was investigated. The results showed that the breakthrough behavior in the absorbing column was significantly different for PAHs with different volatility, and influenced by wind speed and temperature. For PAHs with 10gPL （PL denoted subcooled liquid vapor pressure with the unit of Pa） between -5 and -2,the loss rate in the absorbing column was about 5 % ,and positively correlated with wind speed. The correction of these PAHs by loss rate might not be necessary. PAHs with 10gPL〉-2 basically existed in the gas phase,and the loss rate was positively correlated with 10gPL and wind speed. After loss rate correction,the concentration of these PAHs could increase as much as 77.2%. PAHs with 10gPL 〈-5 basically presented in the particle phase,and its capture in the FTS absorbing column might be random. Thus, the loss rate correction was not suitable for these PAHs. In addition,the loss rate of highly volatile PAHs obtained by FTS could be used as reference for the active samples with similar environmental conditions and sample volumes,which was important for accurate quantification of highly volatile PAHs.

关 键 词：流通式采样器 多环芳烃 穿透行为 定量校正 

分 类 号：X831[环境科学与工程—环境工程]