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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
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Sequential extraction protocol for organic matter from soils and sediments using high resolution mass spectrometry
Malak M Tfaily1, Rosalie K Chu1, Jason Toyoda1
1Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Division, Richland, WA, USA.
Analytica Chimica Acta
|May 13, 2017
Summary
Researchers developed a new sequential extraction method to analyze soil organic matter (SOM) diversity. This method efficiently extracts a wider range of organic compounds from soils and sediments, aiding in understanding carbon cycling and ecosystem responses.
Area of Science:
- Environmental Chemistry
- Soil Science
- Organic Geochemistry
Background:
- Soil organic matter (SOM) comprises diverse organic compounds crucial for the terrestrial carbon cycle and ecosystem functions.
- Understanding SOM composition is key to predicting nutrient cycling, ecosystem responses to perturbations, and climate change impacts.
- Existing methods like parallel solvent extraction (PSE) have limitations in revealing the full diversity of SOM.
Purpose of the Study:
- To develop and compare a sequential chemical extraction procedure for revealing the diversity of organic matter (OM) in various ecosystems.
- To select the optimal extraction method for representative OM fractions from diverse soils and sediments.
- To compare the effectiveness of the new sequential protocol against the established PSE method.
Main Methods:
- Six extraction methods were compared across three sample types: peat soil, spruce forest soil, and river sediment.
- Extraction yield was estimated via dissolved organic carbon (DOC) analysis using total organic carbon (TOC) analysis.
- Composition of extracted OM was analyzed using high-resolution mass spectrometry (HRMS).
Main Results:
- OM composition is strongly dependent on soil and sediment characteristics.
- Two sequential extraction protocols, progressing from polar to non-polar solvents (H2O followed by MeOH-CHCl3 or sequential ACN and CHCl3), yielded the highest diversity and number of organic compounds.
- The developed sequential protocol requires less sample and offers improved sensitivity compared to PSE.
Conclusions:
- Sequential extraction provides a more comprehensive analysis of SOM diversity than PSE.
- The new protocol enables robust ecosystem comparisons based on compound diversity, offering insights into organic compound sources and processing.
- This advancement aids in predicting carbon cycling and ecosystem responses in diverse terrestrial environments.
