What are the current analytical approaches for sediment analysis related to the study of diagenesis? Highlights from 2010 to 2018

Кузнецова, О. В.; Sevastyanov, V. S.; Timerbaev, Andrei R.

doi:10.1016/j.talanta.2018.08.080

Cited by 9 publications

(1 citation statement)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, sedimentary OM is derived from aquatic material such as algae, bacteria, plankton, macrophytes, and nekton formed in situ, but also receives terrestrial OM such as soil, vascular plants, leaves, root exudates and anthropogenic OM such as soil OM, which is easily transported from the upstream catchment into rivers through hydrological processes, finally ending up in sediments (Briand et al 2015;Jeanneau et al 2018;van der Meij et al 2018). Sediments are also a reactive compartment where diagenetic processes occur, inducing physical, chemical, and/or biological changes to the sedimentary OM (Henrichs 1992;Kuznetsova et al 2019;Milliken 2003). Among the diagenetic processes, biodegradation plays a key role in OM biogeochemistry as it is one of the main processes causing changes in its amount, composition, and properties in aquatic systems (Moran et al, 2000;Arndt et al, 2013;Sankar et al, 2019;Derrien et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Exploration of changes in the chemical composition of sedimentary organic matter and the underlying processes during biodegradation through advanced analytical techniques

Derrien,

Jeanneau,

Jardé

et al. 2023

Environ. Chem.

View full text Add to dashboard Cite

Environmental context Organic matter (OM) biodegradation plays a key role as it is one of the main processes causing changes in the amount, composition and properties of OM in sediment. However, a complete understanding of its processes and mechanisms is still not reached. In this study, we aim to explore the chemical composition changes during biodegradation and identify underlying processes. Rationale Although the scientific community has widely investigated organic matter biodegradation processes, only a limited number of studies have explored the molecular changes of this material, whereas its structure, composition and origin play a key role in these processes. Methodology We decided to examine the effects of biodegradation on the chemical composition of sedimentary organic matter and to explore the underlying mechanisms. We conceived a laboratory-based degradation experiment utilising organic-rich sediments artificially composed of two contrasting organic matter end-members (i.e. soil and algae) under two oxygen conditions. The sediment samples before and after incubation were then analysed by laser desorption ionisation–Fourier-transform–ion cyclotron resonance–mass spectrometry for molecular characterisation and by thermally assisted hydrolysis and methylation gas chromatography–mass spectrometry in order to offer insights into the mechanisms driving the biodegradation processes. Results Our results from molecular characterisation unveiled distinct pathways of biodegradation contingent upon the source material. Moreover, they hinted at a predilection for altering high molecular weight compounds like lignin & carboxylic-rich alicyclic molecules (CRAM) and condensed aromatic structures (CAS), manifesting as a conversion into lower molecular weight counterparts. Furthermore, the complementary findings from biomarker analyses underscored the influence of environmental factors – specifically oxygen conditions and microbial communities – on organic matter decomposition. Discussion Although this study is a controlled laboratory experiment and more studies are needed, it demonstrates the intricate interplay among chemical, biological and environmental factors that profoundly shape the reactivity of organic matter. This study underscores the critical need for persistent inquiry, aimed at unravelling the factors and conditions governing the diverse pathways of biodegradation.

show abstract