Dicarbonyl products of the OH radical-initiated reactions of naphthalene and the Cl- and C2-alkylnaphthalenes.
Dicarbonyl products of the OH radical-initiated reactions of naphthalene and the Cl- and C2-alkylnaphthalenes.
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DOI：
10.1021/es0628102
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发表时间：
2007-03
影响因子：
11.4
通讯作者：
Lin Wang;R. Atkinson;J. Arey
中科院分区：
文献类型：
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作者：
Lin Wang;R. Atkinson;J. Arey
萘和C1-和C2-烷基萘是城市大气中含量最丰富的多环芳烃（PAHs）。它们的大气损失过程主要是通过与羟基（OH）自由基的气相反应。本文采用现场直接空气采样大气压电离质谱（API-MS）和气相色谱-质谱（GC/MS）技术，研究了OH自由基与萘、萘-ds、1-和2-甲基萘（MN）、1-和2-MN-dio、1-和2-乙基萘（EN）的气相反应产物，和10种异构体二甲基萘（DMN）。主要反应产物是分子量比母体化合物高32个质量单位的开环二羰基化合物，一种或多种由于失去两个P-碳和相关烷基而产生的较低分子量的开环二羰基化合物，以及可能是环氧化物的含环化合物。邻苯二甲酸酐和烷基取代的邻苯二甲酸酐被观察到作为第二代产物。萘环上烷基取代的位置是决定开环位置和异构产物分布的关键因素。
Naphthalene and the C1- and C2-alkylnaphthalenes are the most abundant polycyclic aromatic hydrocarbons (PAHs) in urban atmospheres. Their major atmospheric loss process is by gas-phase reaction with hydroxyl (OH) radicals. In this study, we have used in situ direct air sampling atmospheric pressure ionization mass spectrometry (API-MS) as well as gas chromatography-mass spectrometry (GC/MS) techniques to investigate the products of the gas-phase reactions of OH radicals with naphthalene, naphthalene-ds, 1- and 2-methylnaphthalene (MN), 1- and 2-MN-dio, 1- and 2-ethylnaphthalene (EN), and the 10 isomeric dimethylnaphthalenes (DMNs). The major reaction products are ring-opened dicarbonyls that are 32 mass units higher in molecular weight than the parent compound, one or more ring-opened dicarbonyls of lower molecular weight resulting from loss of two P-carbons and associated alkyl groups, and ring-containing compounds that may be epoxides. Phthalic anhydride and alkyl-substituted phthalic anhydrides were observed as second generation products. The position of alkyl-substitution on the naphthalene ring is a key factor determining the ring cleavage site and the isomeric product distribution.