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Automated Determination of Magnesium in Soil Extracts by Atomic Absorption Spectrophotometry¹

ABSTRACT

A procedure for automated determination of Mg in soil extracts by atomic absorption spectrophotometry is presented. A modified Morgan solution (0.625N NH₄OH + 1.25N CH₃COOH, pH 4.8) was used to extract Mg from the soil. Measurement of Mg in 60 soil extracts by the proposed automated method gave results which were not different from those of an accepted manual procedure. Interferences with Mg absorbance caused by levels of Al, Si, and P higher than those found in most NH₄OAc soil extracts were not great enough to necessitate use of a Sr diluent to eliminate the interferences.

¹ Scientific Contribution no. 317, Agr. Exp. Sta. Univ. of Connecticut, Storrs.

² Assistant Professor of Agronomy, Plant Science Department.

Accepted for publication July 4, 1968.