An autonomous remotely operated gas chromatograph for chemically resolved monitoring of atmospheric volatile organic compounds
An autonomous remotely operated gas chromatograph for chemically resolved monitoring of atmospheric volatile organic compounds
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用于大气挥发性有机化合物化学解析监测的自主远程操作气相色谱仪
DOI：
10.1039/d2ea00079b
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Isaacman-VanWertz, Gabriel
中科院分区：
文献类型：
--
作者：
McGlynn, Deborah F.;Panji, Namrata Shanmukh;Frazier, Graham;Bi, Chenyang;Isaacman-VanWertz, Gabriel
挥发性有机化合物(VOCs)与大气氧化剂的反应速率相差几个数量级。因此，研究它们在大气中的季节和年份浓度需要异构体分辨，以充分了解它们对氧化剂收支和二次有机气溶胶形成的影响。开发了一种自动气相色谱/火焰离子化检测器(GC-FID)，用于在偏远地点对C5-C15烃进行每小时采样和分析。样品收集在风冷多床吸附捕集器上，用于预浓缩目标挥发性范围内的碳氢化合物，专门设计以最大限度地减少死体积，并实现快速加热和样品冲洗。仪器控制使用定制的电子设备，允许灵活的自主操作，成本适中，具有自动数据传输和处理功能。该仪器已经部署了两年多，样本采集自位于弗吉尼亚州中部佩斯研究森林的弗吉尼亚森林实验室。我们在这里介绍了仪器本身的设计、控制电子学以及校准和数据分析方法，以促进大气化学界开发类似的系统。所有物种的检测下限都在几个到几十个ppt的范围内，该仪器适用于各种生物、轻微氧化和人为(主要是碳氢化合物)化合物的检测。来自校准的数据被检查以提供对仪器稳定性的理解并量化不确定度。在这项工作中，我们提出了未来部署的挑战和建议，以及建议的调整，以减少所需的维护和增加仪器的正常运行时间。目前的设计特别适用于长期和远程部署战役，在这些战役中，难以获得、维护和运输物资。
Volatile organic compounds (VOCs) range in their reaction rates with atmospheric oxidants by several orders of magnitude. Therefore, studying their atmospheric concentrations across seasons and years requires isomer resolution to fully understand their impact on oxidant budgets and secondary organic aerosol formation. An automated gas chromatograph/flame ionization detector (GC-FID) was developed for hourly sampling and analysis of C5–C15 hydrocarbons at remote locations. Samples are collected on an air-cooled multibed adsorbent trap for preconcentration of hydrocarbons in the target volatility range, specifically designed to minimize dead volume and enable rapid heating and sample flushing. Instrument control uses custom electronics designed to allow flexible autonomous operation at moderate cost, with automated data transfer and processing. The instrument has been deployed for over two years with samples collected mid-canopy from the Virginia Forest Laboratory located in the Pace research forest in central Virginia. We present here the design of the instrument itself, control electronics, and calibration and data analysis approaches to facilitate the development of similar systems by the atmospheric chemistry community. Detection limits of all species are in the range of a few to tens of ppt and the instrument is suitable for detection of a wide range of biogenic, lightly oxygenated, and anthropogenic (predominantly hydrocarbon) compounds. Data from calibrations are examined to provide understanding of instrument stability and quantify uncertainty. In this work, we present challenges and recommendations for future deployments, as well as suggested adaptions to decrease required maintenance and increase instrument up-time. The presented design is particularly suitable for long-term and remote deployment campaigns where access, maintenance, and transport of materials are difficult.
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“测量报告：美国东南部森林中生物挥发性有机化合物成分的变化及其在大气反应性中的作用”的补充材料
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Deborah F. McGlynn;Laura E. R. Barry;M. Lerdau;S. Pusede;G. Isaacman
通讯作者：
G. Isaacman
影响因子：
3.8
作者：
Bourtsoukidis, Efstratios;Helleis, Frank;Williams, Jonathan
通讯作者：
Williams, Jonathan
影响因子：
5.1
作者：
Guenther, A. B.;Jiang, X.;Wang, X.
通讯作者：
Wang, X.
影响因子：
4.9
作者：
Davison, B.;Taipale, R.;Hewitt, C. N.
通讯作者：
Hewitt, C. N.
开发原位双通道热解吸气相色谱仪，用于挥发性、中挥发性和半挥发性有机化合物的一致定量
影响因子：
3.8
作者：
R. Wernis;N. Kreisberg;R. Weber;Yutong Liang;J. Jayne;S. Hering;A. Goldstein
通讯作者：
A. Goldstein