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An 8-Hydroxyquinoline Method for Labile and Total Aluminum in Soil Extracts¹

ABSTRACT

The 8-hydroxyquinoline method was modified to measure kinetically labile Al in aqueous soil extracts containing Al-complexing ligands and to measure total soluble Al after removal of fluoride and organic C. Nonlabile Al complexed by F, C, Si, and OH in the original samples is calculated as the difference between total and labile forms. The method measures as little as 100 ng of Al in soil extracts and natural water samples.

¹ Contribution from New York State Agric. Exp. Stn., Agronomy Paper no. 1446.

² Research Associate, Research Assistant, and Assistant Professor, respectively, Dep. of Agronomy, Cornell Univ., Ithaca, NY 14853. Current address of second author is Ruakura Soil & Plant Res. Stn., Priv. Bag, Hamilton, New Zealand 62-839.

Received for publication November 8, 1982. Accepted for publication May 9, 1983.