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首页> 外文期刊>Journal of Atmospheric Chemistry >Determination of aldehydes and acetone in fog water samples via online concentration and HPLC
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Determination of aldehydes and acetone in fog water samples via online concentration and HPLC

机译：在线浓度和高效液相色谱法测定雾水样品中的醛和丙酮

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Aldehydes and ketones, ubiquitous air, cloud, and fog water pollutants, are precursors to secondary organic aerosol formation and photochemical smog. Traditional aldehyde and ketone determination methods involve the addition of 2,4-dinitrophenylhydrazine (DNPH) as a derivatization agent, but many require a large sample volume or a lengthy extraction/concentration process. For fog water, where the sample size is inherently small, a DNPH derivatization method, based on U.S. EPA Method 8315A, was developed to combat this issue. In this method, a manual injection online concentration system in conjunction with HPLC was used, eliminating all liquid-liquid extraction and concentration steps and reducing the required sample volume. Hence, concentration and separation were combined in a single step. Using this injection method shortened the procedure time and also lowered the limit of detection to the nanomolar range. In this study, fourteen fog water samples, collected from October 2012 through April 2014 in Baton Rouge, LA, were analyzed for the concentration of aldehydes and ketones in order to test the feasibility of this method. Dissolved organic content (DOC), ionic concentration, and pH were measured. Formaldehyde, acetaldehyde, acrolein, butyraldehyde, benzaldehyde, and acetone were quantified. The DOC of the collected fog samples varied between 6.2 and 262.2 mgC/L. The wide range of organic content in the fog water samples corresponds to a diverse sample set, highlighted by the large variation of observed acetone concentration (under 5 nM to 1.05 mM). However, formaldehyde had a relatively stable concentration between each event (0.5 to 4.5 mu M).
机译：醛和酮，普遍存在的空气，云和雾水污染物是二次有机气溶胶形成和光化学烟雾的先兆。传统的醛和酮测定方法涉及添加2,4-二硝基苯肼（DNPH）作为衍生剂，但是许多方法需要大量的样品或冗长的提取/浓缩过程。对于样本量本质上较小的雾水，开发了一种基于美国EPA方法8315A的DNPH衍生化方法来解决此问题。在这种方法中，使用了手动进样在线浓缩系统和HPLC，省去了所有液-液提取和浓缩步骤，并减少了所需的样品量。因此，浓缩和分离在单个步骤中合并。使用这种进样方法可以缩短操作时间，并将检测限降低到纳摩尔范围。在这项研究中，分析了2012年10月至2014年4月在路易斯安那州巴吞鲁日（Baton Rouge）收集的14个雾水样品中醛和酮的浓度，以测试该方法的可行性。测量溶解的有机物含量（DOC），离子浓度和pH。定量甲醛，乙醛，丙烯醛，丁醛，苯甲醛和丙酮。收集的雾样品的DOC在6.2和262.2 mgC / L之间变化。雾状水样品中的有机物含量范围很广，对应于多样化的样品组，突出的是所观察到的丙酮浓度（在5 nM至1.05 mM之间）的巨大变化。但是，甲醛在每次事件之间的浓度相对稳定（0.5至4.5μM）。

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