Chemical Characterization of Gas- and Particle-Phase Products from the Ozonolysis of α-Pinene in the Presence of Dimethylamine.
Chemical Characterization of Gas- and Particle-Phase Products from the Ozonolysis of α-Pinene in the Presence of Dimethylamine.
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DOI：
10.1021/acs.est.6b06231
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发表时间：
2017-05
影响因子：
11.4
通讯作者：
Geoffroy Duporté;M. Riva;J. Parshintsev;Enna Heikkinen;L. Barreira;N. Myllys;L. Heikkinen;K. Hartonen;M. Kulmala;M. Ehn;M. Riekkola
中科院分区：
文献类型：
--
作者：
Geoffroy Duporté;M. Riva;J. Parshintsev;Enna Heikkinen;L. Barreira;N. Myllys;L. Heikkinen;K. Hartonen;M. Kulmala;M. Ehn;M. Riekkola
胺被认为是新粒子形成（NPF）和二次有机气溶胶（SOA）形成的关键化合物。此外，α-蒎烯的臭氧分解对大气中生物源SOA的形成也有重要贡献。在流动管式反应器中，研究了二甲胺（DMA）存在下α-蒎烯的臭氧氧化降解反应。研究了胺对SOA形成和化学组成的影响。在DMA存在下观察到NPF和SOA形成的增强。通过高分辨率质谱技术对气相和颗粒相产物的化学表征揭示了含氮化合物的形成。研究了α-蒎烯臭氧氧化反应产物--蒎醛或蒎酮酸与DMA的反应。对反应产物的形成提出了可能的反应途径。在SMEAR II站（芬兰Hyytiälä）收集的气溶胶样品（PM 1）中也观察到了实验室研究中确定的一些化合物，这表明DMA可能会影响环境条件下α-蒎烯的臭氧分解。
Amines are recognized as key compounds in new particle formation (NPF) and secondary organic aerosol (SOA) formation. In addition, ozonolysis of α-pinene contributes substantially to the formation of biogenic SOAs in the atmosphere. In the present study, ozonolysis of α-pinene in the presence of dimethylamine (DMA) was investigated in a flow tube reactor. Effects of amines on SOA formation and chemical composition were examined. Enhancement of NPF and SOA formation was observed in the presence of DMA. Chemical characterization of gas- and particle-phase products by high-resolution mass spectrometric techniques revealed the formation of nitrogen containing compounds. Reactions between ozonolysis reaction products of α-pinene, such as pinonaldehyde or pinonic acid, and DMA were observed. Possible reaction pathways are suggested for the formation of the reaction products. Some of the compounds identified in the laboratory study were also observed in aerosol samples (PM1) collected at the SMEAR II station (Hyytiälä, Finland) suggesting that DMA might affect the ozonolysis of α-pinene in ambient conditions.