A Quantitative Method to Measure and Speciate Amines in Ambient Aerosol Samples
A Quantitative Method to Measure and Speciate Amines in Ambient Aerosol Samples
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DOI：
10.3390/atmos11080808
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发表时间：
2020-07
期刊：
影响因子：
2.9
通讯作者：
A. Sullivan;K. Benedict;C. Carrico;M. Dubey;B. Schichtel;J. Collett
中科院分区：
文献类型：
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作者：
A. Sullivan;K. Benedict;C. Carrico;M. Dubey;B. Schichtel;J. Collett
环境活性氮是含氮有机和无机化合物的混合物。这些不同的化合物以氧化和还原形式的氮存在于气溶胶和气相中。气溶胶相还原氮主要被认为包括铵和胺。在环境样品中，通常会测定铵浓度，但不会测定胺的贡献。我们开发了一种从环境气溶胶样品中离散测量胺的方法。它采用离子色谱法，使用 Thermo Scientific IonPac Dionex CS-19 色谱柱进行电导率检测，并使用甲磺酸洗脱液进行三步分离。该方法可对 18 种不同的胺进行定量，包括甲胺系列和丁胺的不同异构体。当将此方法应用于在落基山国家公园 (RMNP) 和科罗拉多州格里利收集的环境过滤器样品时，几乎所有可通过此技术定量的胺都会定期测量。两个地点的胺总和约为 0.02 µg m−3。 RMNP 和格里利的浓度分别增加到 0.04 和 0.09 µg m−3，同时它们受到烟雾的影响。然而，对单独的新鲜生物质燃烧源样品的分析表明，烟雾可能是大多数环境中胺的次要排放源。
Ambient reactive nitrogen is a mix of nitrogen-containing organic and inorganic compounds. These various compounds are found in both aerosol- and gas-phases with oxidized and reduced forms of nitrogen. Aerosol-phase reduced nitrogen is predominately thought to include ammonium and amines. In ambient samples, the ammonium concentration is routinely determined, but the contribution of amines is not. We developed a method to discretely measure amines from ambient aerosol samples. It employs ion chromatography using a Thermo Scientific IonPac Dionex CS-19 column with conductivity detection and a three-step separation using a methanesulfonic acid eluent. This method allows for the quantification of 18 different amines, including the series of methylamines and the different isomers of butylamine. Almost all amines quantifiable by this technique were measured regularly when applying this method to ambient filter samples collected in Rocky Mountain National Park (RMNP) and Greeley, CO. The sum of the amines was ~0.02 µg m−3 at both sites. This increased to 0.04 and 0.09 µg m−3 at RMNP and Greeley, respectively, at the same time they were impacted by smoke. Analysis of separate, fresh biomass burning source samples, however, suggests that smoke is likely a minor emission source of amines in most environments.