FT-ICR-MS combined with fluorescent spectroscopy reveals the driving mechanism of the spatial variation in molecular composition of DOM in 22 plateau lakes

Pan, Baozhu; Liu, Siwan; Wang, Yeyong; Li, Dianbao; Li, Ming

doi:10.1016/j.envres.2023.116272

Cited by 6 publications

(2 citation statements)

References 79 publications

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“…19 The combination of fluorescence spectroscopy with FT-ICR MS is proved to be an effective approach for identifying MP-DOM components in the supernatant. 20 Additionally, extended X-ray absorption fine structure (EXAFS) spectroscopy is an effective method for investigating the interactions between MP-DOM and iron minerals. It enables the determination of localized structure and bonding environments of metals at molecular and atomic levels.…”

Section: Introductionmentioning

confidence: 99%

“…Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) can provide access to thousands of molecular formulas in DOM, greatly improving our ability to observe the intricate and heterogeneous nature of DOM at the molecular level . The combination of fluorescence spectroscopy with FT-ICR MS is proved to be an effective approach for identifying MP-DOM components in the supernatant . Additionally, extended X-ray absorption fine structure (EXAFS) spectroscopy is an effective method for investigating the interactions between MP-DOM and iron minerals.…”

Section: Introductionmentioning

confidence: 99%

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Interactions between Iron Minerals and Dissolved Organic Matter Derived from Microplastics Inhibited the Ferrihydrite Transformation as Revealed at the Molecular Scale

Zhang,

Ding,

Qiu

et al. 2024

Environ. Sci. Technol.

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Microplastic-derived dissolved organic matter (MP-DOM) is an emerging carbon source in the environment. Interactions between MP-DOM and iron minerals alter the transformation of ferrihydrite (Fh) as well as the distribution and fate of MP-DOM. However, these interactions and their effects on both two components are not fully elucidated. In this study, we selected three types of MP-DOM as model substances and utilized Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and extended X-ray absorption fine structure (EXAFS) spectroscopy to characterize the structural features of DOMs and DOM-mineral complexes at the molecular and atomic levels. Our results suggest that carboxyl and hydroxyl groups in MP-DOM increased the Fe−O bond length by 0.02− 0.03 Å through interacting with Fe atoms in the first shell, thereby inhibiting the transformation of Fh to hematite (Hm). The most significant inhibition of Fh transformation was found in PS-DOM, followed by PBAT-DOM and PE-DOM. MP-DOM components, such as phenolic compounds and condensed polycyclic aromatics (MW > 360 Da) with high oxygen content and high unsaturation, exhibited stronger mineral adsorption affinity. These findings provide a profound theoretical basis for accurately predicting the behavior and fate of iron minerals as well as MP-DOM in complex natural environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%