Characterization of major and trace elements in sclerotium grains

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<jats:title>Summary</jats:title><jats:p>Sclerotium grains in soil contain humus‐metal complexes that are probably produced from fungal metabolites. The characterization of major elements in sclerotium grains collected from volcanic ash soils in Mt Myoko was examined by X‐ray photoelectron spectroscopy, FT‐IR spectrometry and CHN analysis, and the concentration of trace elements was determined by PIXE (particle induced X‐ray emission spectrometer) analysis. The content of major elements, C, H, N, O and Al, was approximately 47.6, 3.32, 0.78, 30.2 and 1.4% by mass, respectively. Trace elements such as Ti, Cr, Mn, Cu, Zn, Br and Pb were detected in the grains at concentrations between 10 and 100 μg g<jats:sup>−1</jats:sup>. Functional carbon groups for the whole grain were characterized by the dominance of O‐alkyl C associated with aromatic C. The comparison between the surface and subsurface (matrix) of the grain showed that the concentrations of O, C and N were relatively greater on the surface of sclerotium grains than in the matrix. The proportion of carbon having C–O, C=O, and O–C=O bonds, O and N showed a tendency to decrease from the surface towards the matrix. The proportion of C assigned as C–C and/or C–H bonds had a tendency to increase towards the matrix associated with Al.</jats:p>

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