Determination of inorganic monomeric Aluminium with the 60 s Pyrocatechol violet technique

A method for measuring the concentration of inorganic, monomeric Al in fluid samples was tested. The technique was found suitable as Al-organic acid complexes (malate) and polymeric Al (as calculated on the basis of sample pH and total Al concentration) did not interfere. A much simpler calibration procedure than in the original description by Kerven et al. (1989) was found satisfactory. Application of the technique to sample from a nutrient solution experiment show the importance of tight pH control in such experiments.

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