Abstract

QUIROS, Miriam Barquero. Development and Optimization of a Voltammetry Adsortive Method with Alizarine for Aluminium Determination in Water. Port. Electrochim. Acta [online]. 2005, vol.23, n.3, pp.403-411. ISSN 0872-1904.

Some of the aluminium complexes are electroactive at positive potentials, being necessary a carbon vitreous electrode to their quantitative determination. Nevertheless the aluminium alizarine complex could be measured at negative potential with a mercury hanging electrode, but this complex is not electroactive at negative potential; instead of that, the residual alizarin non complex could be measured. The kinetic complex is very slow, so it is necessary to heat at 80 ⁰C, for five minutes.  The study of experimental conditions of complex formation was established at   pH 9.25 and is determinant in the complex formation; besides, the buffers employed should be of high regulatory capacity to obtain derivative formation. The optimization of the measurement experimental conditions was done by square wave voltammetry (SWV). Detection limit got using standard deviation of seven blank solutions was 3 mg /L, the variation coefficient was 8%, and the mean recovery for 16 mg /L was 97%. The calibration curves were done in a linear interval of 8 to 64 mg /L.  The method application to water samples is possible after previous evaporation.

Keywords : adsortive square wave voltammetry; alizarine; aluminium; experimental conditions; method optimization; tap water.

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