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Extraction of Aluminum from Aluminum-Organic Matter Complexes¹

ABSTRACT

The objective of this study was to compare extractabilities of Al from Al-treated peats using KCl, CuCl₂, and HCl to the total Al content determined after dry ashing. Results showed that Al extracted by CuCl₂ or HCl correlated well with the total amount of Al present in the system. On the other hand, 1N KCl extracted less than 50% of the total Al. The amount of Al extracted by CuCl₂ from peat-Al-clay mixtures was the same regardless of organic matter content, but KCl-extractable Al was decreased by the addition of organic matter. Apparently some inorganic Al from clay interlayers was also extracted by CuCl₂. Extraction of two field samples of Maury silt loam with different organic matter content showed that 1N CuCl₂ could be used to estimate the amount of Al held by organic matter.

¹ Contribution from the Agronomy Dep., Univ. of Kentucky, Lexington, KY 40546. Published with the approval of the director of the Kentucky Agric. Exp. Stn. as Journal Article no. 80-3-74.

² Former Graduate Research Assistant and Professor, respectively. Senior author is presently Assistant Professor, Agronomy Dep., Univ. of Georgia Agric. Exp. Stn., Experiment, GA 30212.

Received for publication April 22, 1980. Accepted for publication June 13, 1980.

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