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Abstract The acid-base properties of four leaf litter extracts, LLE (eucalyptus, fern, oak and chestnut coverture), were characterized by synchronous fluorescence (SyF) spectroscopy and compared with those of two fulvic acids (FA) extracted from two different horizons (05 and 515 cm) of an oak forest soil. The characterization was based on the variation with the pH of the properties of the fluorescent...
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