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.

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一种测量和确定环境气溶胶样品中胺的定量方法

环境活性氮是含氮有机和无机化合物的混合物。在气态和气态中都发现了这些各种化合物，并具有氧化和还原形式的氮。气溶胶相还原的氮主要被认为包括铵和胺。在环境样品中，通常确定铵的浓度，但不能确定胺的贡献。我们开发了一种从环境气溶胶样品中离散测量胺的方法。它通过使用Thermo Scientific IonPac Dionex CS-19色谱柱的离子色谱进行电导检测，并使用甲磺酸洗脱液进行三步分离。该方法可定量18种不同的胺，包括一系列的甲胺和不同的丁胺异构体。在两个站点上均为^-3。在RMNP和Greeley，它们分别增加到0.04和0.09 µg m ^-3，同时它们还受到烟雾的影响。但是，对单独的新鲜生物质燃烧源样品进行的分析表明，在大多数环境中，烟雾可能是胺的次要排放源。