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The compositions of humic acids (HAs) from various Histosols in North America and Europe, of similarly treated plant-extracted materials (PEMs), of coal-extracted humic acids, and of International Humic Substances Society (IHSS) Florida peat were quantified by solid-state 13C nuclear magnetic resonance (NMR). In order to obtain quantitative intensities, the peak areas in direct-polarization 13-kHz...
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