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説明:

Compositional analysis (CA)—identification and quantification of the system constituents—is the most fundamental and decisive approach to investigate the system of interest. Pyrolysis mass spectrometry (MS) with high resolution over 10,000 is very effective for chemical identification and directly applicable to polymer materials regardless of their solubilities; however, it is less helpful for quantification especially when the references, i.e., pure constituents, are unknown, non-isolable and thus unpreparable. To compensate this weakness, herein we propose reference-free quantitative mass spectrometry (RQMS) with enhanced quantification accuracy assisted by synchronized thermogravimetry (TG). The key to success lies in correlating the instantaneous weight loss from TG with MS signal, enabling the quantitative evaluation of the distinct ionization efficiency for each fragment individually. The determined ionization efficiencies allow conversion of MS signal intensities of pyrolyzed fragments into weight abundances. In a benchmark test using ternary polymer systems, this new framework named TG-RQMS demonstrates accurate CA within ±1.3 wt% errors without using any knowledge nor spectra of the references. This simple yet accurate and versatile CA method would be an invaluable tool to investigate polymer materials whose composition is hardly accessible via other analytical methods.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: TG-MS, reference-free quantitative mass spectrometry, compositional analysis, pyrolysis-MS

刊行年月日: 2024-06-26

出版者: Royal Society of Chemistry

掲載誌:

• ANALYST (ISSN: 00032654)

研究助成金:

• JSPS JSPS KAKENHI Grant NumberJP24K08520 (ポリマーシークエンサーを基軸とした配列工学の確立)
• JST JPMJCR19J3

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1039/D4AN00624K

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更新時刻: 2024-07-22 16:30:24 +0900

MDRでの公開時刻: 2024-07-22 16:30:25 +0900