Ultrahigh Resolution Mass Spectrometry and Indicator Species Analysis to Identify Marker Components of Soil- and Plant Biomass-Derived Organic Matter Fractions

2010 ◽  
Vol 44 (22) ◽  
pp. 8594-8600 ◽  
Author(s):  
Tsutomu Ohno ◽  
Zhongqi He ◽  
Rachel L. Sleighter ◽  
C. Wayne Honeycutt ◽  
Patrick G. Hatcher
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Indicator Species ◽  
Plant Biomass ◽  
Indicator Species Analysis ◽  
Ultrahigh Resolution ◽  
Species Analysis ◽  
Organic Matter Fractions ◽  
Resolution Mass

Tracking the formation of new brominated disinfection by-products during the seawater desalination process

2020 ◽  
Vol 6 (9) ◽  
pp. 2521-2541 ◽  
Author(s):  
Leanne C. Powers ◽  
Annaleise Conway ◽  
Carys L. Mitchelmore ◽  
Stephen J. Fleischacker ◽  
Mourad Harir ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Seawater Desalination ◽  
Ultrahigh Resolution ◽  
By Products ◽  
Resolution Mass

Ultrahigh resolution mass spectrometry revealed substantial dissolved organic matter changes and the formation of numerous bromine-containing disinfection by-products during the seawater desalination process.

scholarly journals Labilization and diversification of pyrogenic dissolved organic matter by microbes

2021 ◽  
Author(s):  
Aleksandar I. Goranov ◽  
Andrew S. Wozniak ◽  
Kyle W. Bostick ◽  
Andrew R. Zimmerman ◽  
Siddhartha Mitra ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Microbial Biomass ◽  
Forest Fires ◽  
Ion Cyclotron Resonance ◽  
Exact Nature ◽  
Fluorescence Excitation ◽  
Ultrahigh Resolution ◽  
Rain Events ◽  
Resolution Mass

Abstract. With the increased occurrence of forest fires around the world, interest in the chemistry of pyrogenic organic matter (pyOM) and its fate in the environment has increased. Upon leaching from soils by rain events, significant amounts of dissolved pyOM (pyDOM) enter the aquatic environment and interact with microbial communities that are essential for cycling organic matter within the different biogeochemical cycles. To evaluate the bio-reactivity of pyDOM, aqueous extracts of laboratory-produced chars were incubated with soil microbes and the molecular changes to the composition of pyDOM were probed using ultrahigh resolution mass spectrometry (Fourier transform – ion cyclotron resonance – mass spectrometry). Given that photo-degradation also affects the composition and reactivity of pyDOM during terrigenous-to-marine export, the effects of photochemistry were also evaluated in the context of the bio-reactivity of pyDOM. Ultrahigh resolution mass spectrometry revealed that, after incubation, many different (both aromatic and aliphatic) compounds were degraded, and new labile compounds, 22–40 % of which were peptide-like, were produced. This indicated that a portion of pyDOM has been labilized into microbial biomass during the incubations. Fluorescence excitation-emission matrix spectra revealed that some fraction of these new molecules is associated with fluorophores from proteinaceous and/or autochthonous/microbial biomass origin. Two-dimensional 1H-1H total correlation NMR spectroscopy identified a peptidoglycan-like backbone within the microbially produced compounds. These results are consistent with previous observations of nitrogen from peptidoglycans within the soil and ocean nitrogen cycles. Interestingly, the exact nature of the bio-produced organic matter was found to vary drastically among samples indicating that the used microbial consortium may produce different exudates based on the composition of the initial pyDOM. Another potential explanation for the vast diversity of molecules is that microbes only consume low molecular weight compounds, but they also produce reactive oxygen species (ROS), which initiate oxidative and recombination reactions that produce new molecules. The observed microbially-mediated diversification of pyDOM suggests that pyDOM contributes to the observed large complexity of natural organic matter. More broadly, pyDOM can be substrate for microbial growth and be incorporated in environmental food webs.

scholarly journals Identification of possible source markers in marine dissolved organic matter using ultrahigh resolution mass spectrometry

2009 ◽  
Vol 73 (15) ◽  
pp. 4384-4399 ◽  
Author(s):  
Elizabeth B. Kujawinski ◽  
Krista Longnecker ◽  
Neil V. Blough ◽  
Rossana Del Vecchio ◽  
Liam Finlay ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Ultrahigh Resolution ◽  
Source Markers ◽  
Resolution Mass
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