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• W2125027863 abstract "Two new approaches to quantify sulfur functionalities in natural organic matter from S K-edge XANES spectroscopy are presented. In the first, the K-edge spectrum is decomposed into Gaussian and two arctangent functions, as in the usual Gaussian curve fitting (GCF) method, but the applicability of the model is improved by a rigorous simulation procedure that constrains the model-fit to converge toward chemically and physically realistic values. Fractions of each type of functionality are obtained after spectral decomposition by correcting Gaussian areas for the change in X-ray absorption cross-section with increasing oxidation state. This correction is made using published calibration curves and a new curve obtained in this study. Calibration-induced errors, inherent to the choice of a particular curve, are typically lower than 5% of total sulfur for oxidized species (e.g., sulfate), may reach 10% for organic reduced sulfur, and may be as high as 30–40% for inorganic reduced sulfur. A generic curve, which reduces the calibration-induced uncertainty by a factor of two on data collected to avoid X-ray overabsorption, is derived. In the second analytical scheme, the K-edge spectrum is partitioned into a weighted sum of component species, as in the usual linear combination fitting (LCF) method, but is fit to an extended database of reference spectra under the constraint of non-negativity in the loadings (Combo fit). The fraction of each sulfur functionality is taken as the sum of all positive fractions of references with similar oxidation state of sulfur. The two proposed methods are applied to eight humic and fulvic acids from the International Humic Substances Society (IHSS). The nature and fractions of sulfur functionalities obtained by the two analytical approaches are consistent with each other. The accuracy of the derived values, expressed as the difference in values of a fraction obtained on the same material by the two independent methods, is on average 4.5 ± 3.0% of total sulfur for exocyclic reduced sulfur, 4.1 ± 2.1% for heterocyclic reduced sulfur, and 1.6 ± 1.4% for sulfate. Total reduced sulfur has a better accuracy of estimation (2.4 ± 1.6%) than either exocyclic and heterocyclic sulfur, because the errors on the two reduced pools have opposite sign. Experimental difficulties and uncertainties of the results associated with the analysis of concentrated and heterogeneous samples are discussed. The spectra of the IHSS materials and the reference compounds are made available as an open source for interlaboratory testing." @default.
• W2125027863 created "2016-06-24" @default.
• W2125027863 creator A5053641292 @default.
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• W2125027863 date "2012-12-01" @default.
• W2125027863 modified "2023-10-14" @default.
• W2125027863 title "Quantitative analysis of sulfur functional groups in natural organic matter by XANES spectroscopy" @default.
• W2125027863 cites W1968755763 @default.
• W2125027863 cites W1969288121 @default.
• W2125027863 cites W1971556334 @default.
• W2125027863 cites W1973036234 @default.
• W2125027863 cites W1979534237 @default.
• W2125027863 cites W1981074568 @default.
• W2125027863 cites W1982942671 @default.
• W2125027863 cites W1983605439 @default.
• W2125027863 cites W1984569014 @default.
• W2125027863 cites W1985577883 @default.
• W2125027863 cites W1987369739 @default.
• W2125027863 cites W1988701085 @default.
• W2125027863 cites W1992782120 @default.
• W2125027863 cites W1993692634 @default.
• W2125027863 cites W1997597126 @default.
• W2125027863 cites W1998790027 @default.
• W2125027863 cites W2003038043 @default.
• W2125027863 cites W2005644965 @default.
• W2125027863 cites W2006098598 @default.
• W2125027863 cites W2007671924 @default.
• W2125027863 cites W2010611481 @default.
• W2125027863 cites W2014816931 @default.
• W2125027863 cites W2018436188 @default.
• W2125027863 cites W2021709343 @default.
• W2125027863 cites W2026640983 @default.
• W2125027863 cites W2026662047 @default.
• W2125027863 cites W2028025173 @default.
• W2125027863 cites W2030227887 @default.
• W2125027863 cites W2033506740 @default.
• W2125027863 cites W2034287229 @default.
• W2125027863 cites W2038344744 @default.
• W2125027863 cites W2040182001 @default.
• W2125027863 cites W2040759790 @default.
• W2125027863 cites W2041291423 @default.
• W2125027863 cites W2041802689 @default.
• W2125027863 cites W2046098102 @default.
• W2125027863 cites W2047399568 @default.
• W2125027863 cites W2049347058 @default.
• W2125027863 cites W2049601576 @default.
• W2125027863 cites W2050452392 @default.
• W2125027863 cites W2053902455 @default.
• W2125027863 cites W2054032740 @default.
• W2125027863 cites W2057006360 @default.
• W2125027863 cites W2060104199 @default.
• W2125027863 cites W2063762135 @default.
• W2125027863 cites W2065462773 @default.
• W2125027863 cites W2066192825 @default.
• W2125027863 cites W2066335614 @default.
• W2125027863 cites W2070227796 @default.
• W2125027863 cites W2072344487 @default.
• W2125027863 cites W2074410446 @default.
• W2125027863 cites W2075667608 @default.
• W2125027863 cites W2076276895 @default.
• W2125027863 cites W2076408882 @default.
• W2125027863 cites W2076609201 @default.
• W2125027863 cites W2076986542 @default.
• W2125027863 cites W2079147825 @default.
• W2125027863 cites W2081539629 @default.
• W2125027863 cites W2082262895 @default.
• W2125027863 cites W2082766618 @default.
• W2125027863 cites W2084239798 @default.
• W2125027863 cites W2084584461 @default.
• W2125027863 cites W2084821401 @default.
• W2125027863 cites W2085248010 @default.
• W2125027863 cites W2091735324 @default.
• W2125027863 cites W2091790782 @default.
• W2125027863 cites W2098504062 @default.
• W2125027863 cites W2121537905 @default.
• W2125027863 cites W2128881477 @default.
• W2125027863 cites W2133825649 @default.
• W2125027863 cites W2139295777 @default.
• W2125027863 cites W2142732439 @default.
• W2125027863 cites W2171044931 @default.
• W2125027863 cites W2320280956 @default.
• W2125027863 cites W2328250730 @default.
• W2125027863 cites W4246779967 @default.
• W2125027863 doi "https://doi.org/10.1016/j.gca.2012.09.033" @default.
• W2125027863 hasPublicationYear "2012" @default.
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