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Selective extraction of humic acids from an anthropogenic Amazonian dark earth and from a chemically oxidized charcoal

Organic GeochemistryBiogeochemistryEnvironmental ChemistryEngineeringEnvironmental GeochemistryHumic AcidsSoil Organic MatterSoil ChemistryAcid PrecipitationOxidized CharcoalSelective ExtractionTerrestrial GeochemistryEarth Science