Electron paramagnetic resonance characteristics of the humic acids from a podzol |
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| Authors: | MV Cheshire BA Goodman DB McPhail GP Sparling |
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| Institution: | The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, U.K. |
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| Abstract: | A study has been made of solid and solution electron paramagnetic resonance (EPR) spectra of humic acids from different horizons in a podzolic soil. Hyperfine splitting was observed in the solution spectra of humic acids from all horizons and depended on the strength of alkali and the period of dissolution. The upper organic horizons L, F and O1 contained humic acids with some spectral characteristics in common with lignin. Humic acid from the lower horizons showed different spectra. At least 5 different radical signals were present. |
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| Keywords: | electron paramagnetic resonance free radical humic acid hyperfine structure solution spectra podzol |
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