Determination of aluminum in plant material by atomic absorption spectrophotometry

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Abstract
A method is proposed for the determination of aluminum in plant material by atomic absorption spectrophotometry using a nitrous oxide‐acetylene flame. Of four compounds tested (ammonium chloride, ammonium nitrate, phosphoric acid and ammonium molybdate), only ammonium molybdate, at 1000 μg/ml Mo in the sample solution, was effective in alleviation of condensed phase interference. Determination of aluminum in the 2% v/v sulphuric acid digest solutions with 1000 μg/ml Mo present against standards containing 2% v/v sulphuric acid and 3000 μg/ml K showed recoveries of added aluminum of 95.7 to 104.5%, satisfactory accuracy in comparison with a colorimetric method and precision of ± 11.9% at 1.8 μg/ml Al and 2.95% at 16.8 μg/ml Al in solution.