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Determination of Magnesium in HCl Solutions of HF-HClO₄ Digests of Soil Clays by Atomic Absorption Spectroscopy¹

ABSTRACT

Interferences to the determination of Mg in HCl solutions of HF-HClO₄ digests of soil clays by atomic absorption spectroscopy were suppressed by 4,000 ppm Sr. Recovery of Mg added to digests ranged from 96 to 106%. Duplicate clay samples of 110 soils were taken from soil suspensions on successive days. The Mg content of these samples ranged from 0.74 to 1.61%. The mean deviation between duplicates was 0.03%, with a range of 0.00 to 0.10%. A rapid method for Mg determination in soil clays by atomic absorption spectroscopy is proposed.

¹ Journal Paper No. J-5445 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Iowa. Project No. 1540.

² Formerly Research Associate, Agron. Dep., Iowa State Univ., and now Assistant Professor, Univ. of Guelph, Guelph, Ontario, Canada; Assistant Scientist, Ames Lab., Iowa State Univ., Ames, Iowa; and Professor, Agron. Dep., Iowa State Univ., respectively.

Received for publication July 12, 1966. Accepted for publication June 30, 1967.