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dc.contributor.author | Nel, Teneille![]() |
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dc.contributor.author | Clarke, Catherine E.![]() |
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dc.contributor.author | Francis, Michele L.![]() |
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dc.contributor.author | Stone, Wendy![]() |
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dc.contributor.author | Cowan, Don A.![]() |
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dc.contributor.author | Botha, Alfred![]() |
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dc.contributor.author | Gallagher, Timothy![]() |
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dc.date.accessioned | 2024-08-28T09:26:04Z | |
dc.date.available | 2024-08-28T09:26:04Z | |
dc.date.issued | 2024 | |
dc.description.abstract | Quantification of oxalate salts in soil clay minerals is necessary to study oxalate biogeochemistry, but existing analytical techniques are expensive and time-consuming. We aim to develop an efficient attenuated total reflectance mid-infrared (MIR) spectroscopic technique to quantify oxalate salts in a clay mineral matrix. We calibrated MIR models for analysis of oxalate anion concentrations in standard solutions (0–0.01 M) by using a partial least-squares regression algorithm. MIR models were also developed for analysis of sodium oxalate (NaOx) and calcium oxalate (CaOx) content in clay mineral mixtures with composition like soils of a semi-arid region and with contrasting concentrations (0–1.0 g g−1 for both oxalate salts) to test sensitivity of analyses. Validation plots (true vs predicted values) showed excellent model fit (R2 ≥ 0.96) and accuracy (normalized root mean squared error of prediction ≤ 0.06) for CaOx, NaOx and oxalic acid components. Once predictive models are stored in analytical software, MIR spectroscopic analyses of samples are much more efficient than chemical techniques. Our MIR spectral-based models are suitable for direct quantification of oxalate salts in clay mineral mixtures for samples like those used for model calibration. | en_US |
dc.description.department | Biochemistry | en_US |
dc.description.department | Genetics | en_US |
dc.description.department | Microbiology and Plant Pathology | en_US |
dc.description.librarian | hj2024 | en_US |
dc.description.sdg | SDG-15:Life on land | en_US |
dc.description.sponsorship | The Stellenbosch University Postgraduate Office, the Skye Foundation, the National Science Foundation (USA) and the National Research Foundation of South Africa. | en_US |
dc.description.uri | http://www.tandfonline.com/loi/lcss20 | en_US |
dc.identifier.citation | Teneille Nel, Catherine E. Clarke, Michele L. Francis, Wendy Stone, Don A. Cowan, Alfred Botha & Timothy Gallagher (2024) Efficient Quantification of Soluble and Insoluble Oxalates in Clay Mineral Mixtures, Communications in Soil Science and Plant Analysis, 55:13, 1985-1999, DOI: 10.1080/00103624.2024.2336574. | en_US |
dc.identifier.issn | 0010-3624 (print) | |
dc.identifier.issn | 1532-2416 (online) | |
dc.identifier.other | 10.1080/00103624.2024.2336574 | |
dc.identifier.uri | http://hdl.handle.net/2263/97907 | |
dc.language.iso | en | en_US |
dc.publisher | Taylor and Francis | en_US |
dc.rights | © 2024 The Author(s). Published with license by Taylor & Francis Group, LLC. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License. | en_US |
dc.subject | Insoluble oxalates | en_US |
dc.subject | Nondestructive analysis | en_US |
dc.subject | Soluble oxalates | en_US |
dc.subject | Whewellite | en_US |
dc.subject | Oxalate salts | en_US |
dc.subject | Clay mineral mixtures | en_US |
dc.subject | SDG-15: Life on land | en_US |
dc.title | Efficient quantification of soluble and insoluble oxalates in clay mineral mixtures | en_US |
dc.type | Article | en_US |