Abstract

Fluoride greater than 0.1<i>N</i> interfered negatively in the determination of Al by the rotating-disk-electrode technique. Fluoride interference was eliminated by the addition of H<sub>3</sub>BO<sub>3</sub>. Aluminum in the 1–100 ppm range was successfully determined in the presence of 0.25<i>N</i> fluoride by making the solutions 2.5% in H<sub>3</sub>BO<sub>3</sub>. The coefficients of variation among six determinations for solutions containing 10 and 100 ppm Al were 3.0% and 0.9%, respectively. Recovery of known amounts of Al added to fluoride-extracts of soils ranged from 98.4% to 102.2%. The proposed method thus gave acceptable accuracy and precision. The method is simple and rapid since it does not require the removal of fluoride by distillation as H<sub>2</sub>SiF<sub>6</sub> nor does it prevent the determination of Si in the same sample.

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