Kinetic study of the reactions of NO2 with polycyclic aromatic hydrocarbons adsorbed on silica particles
Kinetic study of the reactions of NO2 with polycyclic aromatic hydrocarbons adsorbed on silica particles
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DOI：
10.1016/j.atmosenv.2005.07.037
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发表时间：
2005-11
影响因子：
5
通讯作者：
E. Perraudin;H. Budzinski;E. Villenave
中科院分区：
文献类型：
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作者：
E. Perraudin;H. Budzinski;E. Villenave
本实验工作涉及二氧化氮 (NO2) 自由基与吸附在二氧化硅颗粒上的三至六芳烃反应的动力学研究。使用流量管在 295K、无光的情况下进行测量。通过聚焦微波萃取从颗粒中萃取多环芳烃 (PAH)，并使用气相色谱与质谱联用 (GC/MS) 进行分析。对于 1.5×1012 分子 cm−3 的 NO2 浓度，速率常数从 1.4×10−3 到 4×10−8s−1 变化，具体取决于 PAH 的结构。苯并[a]芘的反应性最强，在污染空气条件下，NO2 的寿命只有几分钟。将这些结果与之前报道的碳质颗粒的结果进行比较得出的结论是，PAH 的气/固界面反应性取决于颗粒的性质。
This experimental work deals with the kinetic study of the reactions of nitrogen dioxide (NO2) radical with tri- to hexa-aromatic hydrocarbons adsorbed on silica particles. Measurements were performed using a flow-tube, at 295K, in the absence of light. Polycyclic aromatic hydrocarbons (PAHs) were extracted from particles by focused microwave extraction and analyses were performed using gas chromatography coupled to mass spectrometry (GC/MS). Rate constants varied from 1.4×10−3to 4×10−8s−1, depending on the structure of the PAH, for NO2concentration of 1.5×1012moleculescm−3. Benzo[a]pyrene was the most reactive, with a lifetime regarding NO2of a few minutes in polluted air conditions. The comparison of these results with those previously reported for carbonaceous particles leads to the conclusion that gas/solid interface reactivity of PAHs depends on the nature of the particle.