Development of an In Situ Dual-Channel Thermal Desorption Gas Chromatography Instrument for Consistent Quantification of Volatile, Intermediate Volatility and Semivolatile Organic Compounds
Development of an In Situ Dual-Channel Thermal Desorption Gas Chromatography Instrument for Consistent Quantification of Volatile, Intermediate Volatility and Semivolatile Organic Compounds
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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
DOI：
10.5194/amt-2021-156
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发表时间：
2021
影响因子：
3.8
通讯作者：
A. Goldstein
中科院分区：
文献类型：
--
作者：
R. Wernis;N. Kreisberg;R. Weber;Yutong Liang;J. Jayne;S. Hering;A. Goldstein
抽象的。气溶胶是辐射强迫预测中很大不确定性的一个来源，并且对健康的影响知之甚少。大多数气溶胶物质是在大气中由反应性气相有机前体形成的，形成二次有机气溶胶（SOA）。半挥发性有机化合物（SVOC）（有效饱和浓度，C*为10−1–103 μg m−3）占有机气溶胶的很大一部分，而中挥发性有机化合物（IVOC）（C*为103–106 μg m−3）和挥发性有机化合物（VOC）（C* ≥ 106 μg m−3）是 SOA 和臭氧的气相前体。综合热解吸气溶胶气相色谱仪 (cTAG) 是第一台同时定量多种化合物特定 VOC、IVOC 和 SVOC 的单一仪器。 cTAG 是一款双通道仪器，连接到单个高分辨率飞行时间质谱仪，在一个通道上测量 C5–C16 烷烃当量挥发性 VOC 和 IVOC 的浓度，在另一个通道上测量 C14–C32 SVOC 的浓度，从而实现 15 个数量级的蒸气压的一致定量。 cTAG 每小时获取 SVOC 的浓度，每两小时获取 SVOC 的气体-颗粒分配，从而能够观察这些物质通过氧化和分配到颗粒相的演变。 SVOC 通道的在线衍生化可以检测更多极性和氧化物质。在这项工作中，我们介绍了评估仪器性能关键参数的设计细节和数据，例如 I/VOC 收集器设计优化、使用 I/VOC 定制液体蒸发系统获得的校准曲线的线性度和再现性，以及臭氧去除过滤器对仪器性能的影响。显示了前体与次级产物的示例时间线，并且对 cTAG 可检测的化合物子集的分析证明了该仪器的一些分析可能性。
Abstract. Aerosols are a source of great uncertainty in radiative forcing predictions and have poorly understood health impacts. Most aerosol mass is formed in the atmosphere from reactive gas phase organic precursors, forming secondary organic aerosol (SOA). Semivolatile organic compounds (SVOCs) (effective saturation concentration, C*, of 10−1–103 μg m−3) comprise a large fraction of organic aerosol, while intermediate volatility organic compounds (IVOCs) (C* of 103–106 μg m−3) and volatile organic compounds (VOCs) (C* ≥ 106 μg m−3) are gas phase precursors to SOA and ozone. The Comprehensive Thermal Desorption Aerosol Gas Chromatograph (cTAG) is the first single instrument simultaneously quantitative for a broad range of compound-specific VOCs, IVOCs and SVOCs. cTAG is a two-channel instrument which measures concentrations of C5–C16 alkane equivalent volatility VOCs and IVOCs on one channel and C14–C32 SVOCs on the other coupled to a single High Resolution Time of Flight Mass Spectrometer, achieving consistent quantification across 15 orders of magnitude of vapor pressure. cTAG obtains concentrations hourly and gas–particle partitioning for SVOCs bihourly, enabling observation of the evolution of these species through oxidation and partitioning into the particle phase. Online derivatization for the SVOC channel enables detection of more polar and oxidized species. In this work we present design details and data evaluating key parameters of instrument performance such as I/VOC collector design optimization, linearity and reproducibility of calibration curves obtained using a custom liquid evaporation system for I/VOCs and the effect of an ozone removal filter on instrument performance. Example timelines of precursors with secondary products are shown and analysis of a subset of compounds detectable by cTAG demonstrates some of the analytical possibilities with this instrument.
影响因子：
21.8
作者：
Isaacman-VanWertz G;Massoli P;O'Brien R;Lim C;Franklin JP;Moss JA;Hunter JF;Nowak JB;Canagaratna MR;Misztal PK;Arata C;Roscioli JR;Herndon ST;Onasch TB;Lambe AT;Jayne JT;Su L;Knopf DA;Goldstein AH;Worsnop DR;Kroll JH
通讯作者：
Kroll JH
影响因子：
13.6
作者：
Khare, Peeyush;Machesky, Jo;Gentner, Drew R.
通讯作者：
Gentner, Drew R.