scholarly journals A History of Molecular Level Analysis of Natural Organic Matter by Fticr Mass Spectrometry and The Paradigm Shift in Organic Geochemistry

2020 ◽  
Author(s):  
William T. Cooper ◽  
Jeffrey C. Chanton ◽  
Juliana D'Andrilli ◽  
Suzanne B. Hodgkins ◽  
David C. Podgorski ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Paradigm Shift ◽  
Molecular Level ◽  
Organic Geochemistry ◽  
Fticr Mass Spectrometry ◽  
History Of ◽  
Level Analysis

scholarly journals Laser Desorption/Ionization Coupled to FTICR Mass Spectrometry for Studies of Natural Organic Matter

2017 ◽  
Vol 89 (8) ◽  
pp. 4382-4386 ◽  
Author(s):  
John W. T. Blackburn ◽  
Will Kew ◽  
Margaret C. Graham ◽  
Dušan Uhrín
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Fticr Mass Spectrometry ◽  
Desorption Ionization

Novel molecular-level evidence of iodine binding to natural organic matter from Fourier transform ion cyclotron resonance mass spectrometry

2013 ◽  
Vol 449 ◽  
pp. 244-252 ◽  
Author(s):  
Chen Xu ◽  
Hongmei Chen ◽  
Yuko Sugiyama ◽  
Saijin Zhang ◽  
Hsiu-Ping Li ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Fourier Transform ◽  
Natural Organic Matter ◽  
Cyclotron Resonance ◽  
Molecular Level ◽  
Ion Cyclotron Resonance ◽  
Ion Cyclotron

scholarly journals Spatiotemporal transformation of dissolved organic matter along an alpine stream flow path on the Qinghai–Tibet Plateau: importance of source and permafrost degradation

2018 ◽  
Vol 15 (21) ◽  
pp. 6637-6648 ◽  
Author(s):  
Yinghui Wang ◽  
Robert G. M. Spencer ◽  
David C. Podgorski ◽  
Anne M. Kellerman ◽  
Harunur Rashid ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Molecular Level ◽  
Tibet Plateau ◽  
Permafrost Degradation ◽  
Hydrological Conditions ◽  
14C Age ◽  
Alpine Stream ◽  
Qinghai Tibet Plateau

Abstract. The Qinghai–Tibet Plateau (QTP) accounts for approximately 70 % of global alpine permafrost and is an area sensitive to climate change. The thawing and mobilization of ice-rich and organic-carbon-rich permafrost impact hydrologic conditions and biogeochemical processes on the QTP. Despite numerous studies of Arctic permafrost, there are no reports to date for the molecular-level in-stream processing of permafrost-derived dissolved organic matter (DOM) on the QTP. In this study, we examine temporal and spatial changes of DOM along an alpine stream (3850–3207 m above sea level) by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), accelerator mass spectrometry (AMS) and UV–visible spectroscopy. Compared to downstream sites, dissolved organic matter (DOM) at the headstream site exhibited older radiocarbon age, higher mean molecular weight, higher aromaticity and fewer highly unsaturated compounds. At the molecular level, 6409 and 1345 formulas were identified as unique to the active layer (AL) leachate and permafrost layer (PL) leachate, respectively. Comparing permafrost leachates to the downstream site, 59 % of AL-specific formulas and 90 % of PL-specific formulas were degraded, likely a result of rapid in-stream degradation of permafrost-derived DOM. From peak discharge in the summer to low flow in late autumn, the DOC concentration at the headstream site decreased from 13.9 to 10.2 mg L−1, while the 14C age increased from 745 to 1560 years before present (BP), reflecting an increase in the relative contribution of deep permafrost carbon due to the effect of changing hydrological conditions over the course of the summer on the DOM source (AL vs. PL). Our study thus demonstrates that hydrological conditions impact the mobilization of permafrost carbon in an alpine fluvial network, the signature of which is quickly lost through in-stream mineralization and transformation.

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