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Definition of regional background values of trace element in soils of Castilla-La Mancha region, Spain
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DOI：10.1016/j.apgeochem.2026.106951.png)
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Abstract
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• Determination of geochemical threshold and background values from 869 topsoil samples in Castilla-La Mancha, Spain. • Application of benchtop and portable XRF analysis to determinate 14 chemical elements. • Threshold values derived from cumulative probability plots for seven lithology-based geochemical zones. • Lithology is the main control on the topsoil geochemistry of analysed elements. • The results provide a reference framework for future soil geochemistry studies.
Keywords:
Geochemical background values
Geochemical threshold values
Topsoil
Castilla-La Mancha (CLM)
Portable X-ray fluorescence (pXRF)
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