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Aluminum Studies: II. The Extraction of Aluminum from Some Florida Soils¹

ABSTRACT

A study of soil Al extraction by various chemical reagents has been conducted. Using N NH₄OAc solutions buffered at six different pH levels, it was found that the lower the pH of the solution the more Al was extracted. Neutral normal solutions of BaCl₂, CaCl₂, KCl, NH₄Cl, and a solution of BaCl₂ in triethanolamine buffered at pH 8.1 extracted more Al than neutral N NH₄OAc. Among neutral salts the bivalent cations seemed to be more efficient. BaCl₂ in triethanolamine extracted much more Al than any of the neutral salts, probably due to the complexing capacity of triethanolamine.

Three alkaline reagents—NaOH, NaF, and Na pyrophosphate—commonly used for organic matter extraction, were also tested. Each of these reagents extracted much more Al from sandy and sandy loam soils than the previous reagent group. This Al was believed to originate from various Al compounds in soils including aluminum hydroxide and phosphate and even aluminum silicates.

In order to investigate the relationship between Al and phosphate release, a P-fractionation procedure was used on a Red Bay fine sandy loam. In the extract of each fraction a high amount of Al was found, except with NH₄Cl. Al hydroxide seemed to be the main source contributing to the high Al value obtained from alkalis and fluoride extractions.

¹ Contributed from the Soils Department, with approval of the Director of the Florida Agr. Exp. Sta., Gainesville, as Journal Series No. 773. Presented before Div. II, Soil Science Society of America, Aug. 6, 1958, at Lafayette, Ind.

² Assistant Chemist and Associate Biochemist, respectively.

Received for publication August 15, 1958. Accepted for publication December 24, 1958.