Abstract
An electrochemical procedure is proposed for the speciation of aluminum (Al) by derivative adsorption chronopotentiometry on a hanging mercury drop electrode (HMDE) using pyrocatechol violet (PCV) as a complexing agent. Labile monomeric Al fraction (mainly inorganic Al) was determined at pH 4.9 (accumulation time 60 s, accumulation potential −0.45 V, PCV concentration 1.5×10−6 mol dm−3 and stripping current 5 μA), while total monomeric Al fraction was determined at pH 8.2 (accumulation time 60 s, accumulation potential −0.50 V, PCV concentration 2.5×10−6 mol dm−3 and stripping current 5 μA). This sensitive and simple fractionation method was successfully applied to the speciation of Al in natural water samples. Five fractions were determined and measured: i) labile monomeric Al (Ali); ii) total monomeric Al (Ala); iii) acid reactive Al (Alr); iv) nonlabile monomeric Al (Alo); v) acid soluble Al (Als). The results were satisfactorily in agreement with those of the 8-hydroxyquinoline extraction/ion exchange method.
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