大气多环芳烃在流通式采样器中的穿透行为研究

发布时间：2018-06-18 06:55

本文选题：流通式采样器 + 多环芳烃　；参考：《环境污染与防治》2017年11期

【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。
[Abstract]:Four groups of samples were collected in January and September 2015, respectively, using active sampler to connect FTS sampling tube with flow sampler. Gas chromatography-mass spectrometry (GC-MS) was used to determine 15 PAHs (polycyclic aromatic hydrocarbons) (PAHs), which were preferentially controlled by the United States Environmental Protection Agency (EPA), and their penetrability in FTS column was studied. The results showed that the penetrability of PAHs in the adsorption column was different with the volatility, and was affected by the wind speed and temperature. The loss rate of PAHs with the temperature and wind speed was about 5, and the loss rate of PAHs was about 5 when the temperature and wind speed were -5 ~ (- 2), and there was a positive correlation between PAHs and the wind speed. It is not necessary to correct the loss rate of PAHs in this kind of PAHs. The PAHs of logPL-2 basically exist in gas phase. The loss rate of PAHs is positively correlated with logPL and wind speed. PAHs with the highest concentration of 77.2% and logPL-5 are basically present in the granular phase. It may be random to be captured by FTS adsorption column, so it is not suitable to use the loss rate to correct the PAHs. In addition, the loss rate of high volatile PAHS collected by FTS under similar environmental conditions and sampling amount can be used as a reference for the calibration of active sampler, which is of great significance for accurate quantitative sampling of highly volatile PAHs.
【作者单位】：中国科学院城市环境研究所;中国科学院大学;中国科学院宁波城市环境观测研究站;
【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)
【分类号】：X831

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