大气中的 CFC-11 和 CCl4:PTR-MS 的免费校准标准

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-27 DOI:10.1016/j.ijms.2024.117311
Hanne Ødegaard Notø, Rupert Holzinger
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引用次数: 0

摘要

质子转移反应质谱法(PTR-MS)是一种用于实时监测挥发性有机化合物的分析技术。为了进行定量分析,相关化合物通常使用气体标准进行校准,但如果质量相关传输定义明确,PTR-MS 对未经校准的化合物也能进行定量分析。不过,由于透射率会随时间漂移,因此长期测量具有挑战性。经常进行校准会有所帮助,但这种方法耗时且繁琐,往往会导致仪器校准不足。在这里,我们展示了利用大气中长期存在且全球监测到的化合物作为工具来限制两次校准之间的传输。三氯氟甲烷(CFC-11)和四氯化碳(CCl4)的主要离子的质荷比(m/z)为 116.9,我们建议用它来检索 PTR-MS 的透射率。我们确定 CFC-11 和 CCl4 的伪反应速率常数分别为 0.82 × 10-9 ± 0.05 × 10-9 cm3 s-1 molecule-1 和 1.65 × 10-9 ± 0.08 × 10-9 cm3 s-1 molecule-1。本文介绍的方法可以提高数据质量和准确性,尤其适用于长期大气测量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Atmospheric CFC-11 and CCl4: A free calibration standard for PTR-MS

Proton-transfer-reaction mass spectrometry (PTR-MS) is an analytical technique used to monitor volatile organic compounds in real-time. For quantitative analysis, compounds of interest are typically calibrated using gas standards, but PTR-MS is quantitative to uncalibrated compounds if the mass-dependent transmission is well defined. However, long-term measurements are challenging due to the drift in transmission over time. Performing frequent calibrations helps, but the methods are time-consuming and tedious, often leading to instruments being under-calibrated. Here we show the use of long-lived and globally monitored compounds in the atmosphere as a tool to constrain the transmission between calibrations. The major ion of trichlorofluromethane (CFC-11) and carbon tetrachloride (CCl4) is found at the mass-to-charge ratio (m/z) 116.9, which we propose using to retrieve the transmission of a PTR-MS. We determined the pseudo-reaction rate constants of CFC-11 and CCl4 to be 0.82 × 10−9 ± 0.05 × 10−9 cm3 s−1 molecule−1, and 1.65 × 10−9 ± 0.08 × 10−9 cm3 s−1 molecule−1, respectively. The method introduced here can improve data quality and accuracy, especially for long-term atmospheric measurements.

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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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