An Iodide-Adduct High-Resolution Time-of-Flight Chemical-Ionization Mass Spectrometer: Application to Atmospheric Inorganic and Organic Compounds
An Iodide-Adduct High-Resolution Time-of-Flight Chemical-Ionization Mass Spectrometer: Application to Atmospheric Inorganic and Organic Compounds
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DOI：
10.1021/es500362a
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发表时间：
2014-06-03
影响因子：
11.4
通讯作者：
Thornton, Joel A.
中科院分区：
文献类型：
--
作者：
Lee, Ben H.;Lopez-Hilfiker, Felipe D.;Thornton, Joel A.
使用碘加合物的高分辨率飞行时间化学电离质谱仪（HR-ToF-CIMS）已被表征并部署在几个实验室和现场研究中，以测量一套有机和无机大气物种。碘化物的大负质量缺陷，结合软电离和飞行时间质谱仪的高质量准确度（5500），提供了额外的分离度，并允许测定绝大多数检测到的离子的元素组成。实验室表征表明，碘加合物电离一般我表现出更极性或酸性挥发性有机化合物的敏感性增加。在高频率（>1 Hz）下同时检索宽范围的质荷比（m/Q从25到625 Th）提供了大气氧化化学的全面视图，特别是当从快速移动的平台（如飞机）采样快速演变的羽流时。我们提出的采样协议，检测限和观察，从第一架飞机部署这种类型的仪器，发生在NOAA WP-3D飞机在东南Nexus（SENEX）2013年的现场活动。
A high-resolution time-of-flight chemical-ionization mass spectrometer (HR-ToF-CIMS) using Iodide-adducts has been characterized and deployed in several laboratory and field studies to measure a suite of organic and inorganic atmospheric species. The large negative mass defect of Iodide, combined with soft ionization and the high mass-accuracy ( 5500) of the time-of-flight mass spectrometer, provides an additional degree of separation and allows for the determination of elemental compositions for the vast majority of detected ions. Laboratory characterization reveals Iodide-adduct ionization generally I exhibits increasing sensitivity toward more polar or acidic volatile organic compounds. Simultaneous retrieval of a wide range of mass-to-charge ratios (m/Q from 25 to 625 Th) at a high frequency (>1 Hz) provides a comprehensive view of atmospheric oxidative chemistry, particularly when sampling rapidly evolving plumes from fast moving platforms like an aircraft. We present the sampling protocol, detection limits and observations from the first aircraft deployment for an instrument of this type, which took place aboard the NOAA WP-3D aircraft during the Southeast Nexus (SENEX) 2013 field campaign.