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Updated: Jul 7, 2026

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通过使用 Orbitrap-IRMS 的碳的全分子和内分子稳定同位素比率对 PFOA 的源指纹

Holden M Nelson1,2,3, Zhiliang Xu2,4, Hui Li2,4

  • 1Department of Integrative Biology, Michigan State University, East Lansing, Michigan 48824, United States.

Analytical chemistry
|December 13, 2025
PubMed
概括

一种新的Orbitrap-IRMS方法通过测量碳同位素,准确地追踪超基和多基物质 (PFAS). 这种法医工具有助于识别PFAS来源,这对于环境修复工作至关重要.

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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...