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首页> 外文期刊>Environmental Science & Technology >Trimethylamine as Precursor to Secondary Organic Aerosol Formation via Nitrate Radical Reaction in the Atmosphere
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Trimethylamine as Precursor to Secondary Organic Aerosol Formation via Nitrate Radical Reaction in the Atmosphere

机译：三甲胺作为通过硝酸根自由基反应在大气中形成次级有机气溶胶的前体

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摘要

Amines in fine particulate matter have been detected and quantified during ambient studies of winter inversions in Logan, UT, using aerosol mass spectrometry. Amine-related compounds account for 0.5-6 μg m~(-3) of fine paniculate mass during some wintertime periods. The amine contributions sometimes show a clear diurnal pattern, reaching peak concentrations during the middle of the night while decreasing during the morning and afternoon. Smog chamber reactions show that the reaction of tertiary amines with nitrate radical can account for this behavior in the atmosphere. The lower bound reaction rate of trimethylamine and nitrate radical is estimated at 4.4 × 10~(-16) cm~3/molecules/s with a conversion rate to the aerosol phase of ～65%. This suggests that amines could be a contributor to secondary organic aerosol formation in areas where nitrate radical is a significant player in oxidation chemistry.
机译：在密歇根州洛根市，使用气溶胶质谱法对冬季反转的环境研究进行了检测并定量了细颗粒物中的胺。在冬季，与胺有关的化合物占细粒质量的0.5-6μgm〜（-3）。胺的贡献有时表现出明显的昼夜模式，在深夜达到峰值浓度，而在早晨和下午则降低。烟雾室反应表明，叔胺与硝酸根的反应可以解释这种现象。三甲胺与硝酸根的下限反应速率估计为4.4×10〜（-16）cm〜3 /分子/ s，转化为气溶胶相的转化率为〜65％。这表明在硝酸根在氧化化学中起重要作用的区域中，胺可能是造成次级有机气溶胶形成的原因。

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