Abstract
Abstract A cation exchange resin method, that had previously been developed for the determination uf non-exchangeable K (resin K), was applied to the determination of non-exchangeable Mg (resin Mg). An analysis of variance on the reproducibility of the method showed it to be somewhat variable, with a CV of 11%. A regression line, comparing the results given by an acid-extraction method for non-exchangeable Mg (reserve Mg) with those from the resin method, was curved, the resin method giving lower values for higher reserve Mg levels. Regression lines for reserve Mg on total Mg and resin Mg on total Mg were both linear. The resin method was shown to underestimate non-exchangeable Mg levels when these exceeded approximately 40 me./100 g, and this produced the curvature in the reserve Mg : resin Mg regression line. High levels of non-exchangeable Mg were also found to affect the adsorption of K by the resin, leading to anomalous resin K values. The method offers a rapid and easy means of analysing a large number of samples for non-exchangeable Mg. It should not, however, be used for precise determinations or where non-exchangeable Mg levels could exceed 40 me./100 g.
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