Abstract
Abstract Five colorimetric methods; alzarin red, aluminon, catechol violet, ferron and 8‐hydroxyquinoline, and AAS were compared for measuring aluminium in KCl extracts of soils. An analysis of variance of the results against soils, methods and replicates showed that, apart from the predictably large soil effect, the three two‐way interactions and the method effect gave small but statistically significant differences. The AAS method showed the most variation, and the catechol violet method gave consistently lower results than the other methods, but provided differences in the order of 10% are not considered critical, any of these methods could be used on a routine basis.
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