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Determination of Aluminum Extracted from Soils by ion Chromatography

Division of Biogeochemistry, Univ. of Georgia, Savannah River Ecology Lab., P.O. Drawer E, Aiken, SC 29801. Contribution from the Div. of Biogeochemistry, Savannah River Ecology Lab. of the Univ. of Georgia.

* Corresponding author.

ABSTRACT

A fully automated ion chromatographic (IC) method for the determination of Al extracted with 1 M KCl, 1 M NH₄Cl and 0.2 M NH₄-oxalate was evaluated utilizing a Dionex 2020i ion chromatograph. For Al in the KCl and NH₄Cl extracts, the method involved direct injection of the extract onto a Dionex CG-3 column, post column reaction and complexation of the Al in a Dionex reagent delivery module, and detection on a Dionex UV/Vis detector. The eluant consisted of 0.4 M NH₄Cl acidified to pH 3.1. Standard curves were prepared by plotting the integrated peak intensities of the chromatograms against concentration of standard Al solutions. The standard curve has a very large dynamic linear range (0.05 to 15 mg L^–1). The detection limits of the technique are 50 and 20 µg L^–1 when utilizing a 50 and 100-µL injection loop, respectively. The NH₄-oxalate extractable Al was determined by ashing a sample aliquot, redissolution in HNO₃, and then direct injection onto the CG-3 column. In this application, Fe in the NH₄Ox extract injected onto the CG-3 column can also be quantitatively determined without further sample preparation.

Key Words: KCl- and NH₄Cl-exchangeable Al • NH₄-oxalate-extractable Al • Tiron

Received for publication November 17, 1987.