Quantitative differentiation of coal, char and soil organic matter in an Australian coal minesoil

Chan, Jaclyn, Plante, Alain F., Peltre, Clément, Baumgartl, Thomas and Erskine, Peter (2017) Quantitative differentiation of coal, char and soil organic matter in an Australian coal minesoil. Thermochimica Acta, 650 44-55. doi:10.1016/j.tca.2017.02.006

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Author Chan, Jaclyn
Plante, Alain F.
Peltre, Clément
Baumgartl, Thomas
Erskine, Peter
Title Quantitative differentiation of coal, char and soil organic matter in an Australian coal minesoil
Journal name Thermochimica Acta   Check publisher's open access policy
ISSN 0040-6031
Publication date 2017-04-10
Sub-type Article (original research)
DOI 10.1016/j.tca.2017.02.006
Open Access Status File (Author Post-print)
Volume 650
Start page 44
End page 55
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Subject 3105 Instrumentation
3104 Condensed Matter Physics
1606 Physical and Theoretical Chemistry
Abstract Organic inputs from plant establishment are part of the rehabilitation process in restoring coal minesoil function. Soil organic matter (SOM) content could therefore potentially be an indicator of rehabilitation success. Rehabilitated coal minesoils contain inherited coal and char that complicate the attribution of measured total C to recent SOM inputs. We provide proof-of-principle tests of ramped combustion thermal analyses combined with chemometrics (multivariate curve resolution–alternate least squares, MCR-ALS) to quantitatively distinguish between geogenic C, pyrogenic C and SOM C in model mixtures and a coal minesoil from Queensland, Australia. MCR-ALS successfully separated coal and char, and initial estimate thermograms improved the model fits. Geogenic C represented a small proportion of total organic C in the tested unknown minesoils (mean = 9.2%), and a larger contribution from pyrogenic C (mean = 32.4%). Trends in SOM were also consistent with Walkley-Black measurements of organic C. Our combined thermal-chemometric approach represents a robust means of quantifying SOM, distinct from coal and char, though resolution could be improved using multi-element thermograms and additional end-members and soils.
Keyword Geogenic carbon
Multivariate curve resolution
Pyrogenic carbon
Soil organic matter
Thermal analysis
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Sustainable Minerals Institute Publications
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