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Aluminum Organic Matter in Acid Soils: Salt‐Extractable Aluminum
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1979
Year
Organic GeochemistryEnvironmental ChemistryBiogeochemistryEngineeringAluminum Organic MatterEnvironmental EngineeringSoil ScienceOrganic MatterSoil Organic MatterSoil ChemistrySoil MineralogyGeochemistryNew YorkEarth ScienceAcid InceptisolSoil Biochemistry
Abstract Sample horizons of an acid Inceptisol from New York, an Oxisol from Brazil, and an aluminum‐peat complex containing 1 mole of Al per mole of peat carboxyl groups were extracted with 1 N KCl and 1 N LaCl 3 . For all three materials, LaCl 3 extracted significantly more Al. The quantity of Al extracted expressed as a fraction of the BaCl 2 ‐TEA acidity was greater for the peat than the soils. It was concluded that the fraction of Al bound by organic matter is important in determining the quantity of Al extracted from surface soils by neutral salts and that “exchangeable aluminum” and “effective cation exchange capacity” are defined by the cation and concentration of the extracting salt.