Recommended Citation
Postprint version. Published in Analytica Chimica Acta, Volume 117, January 1, 1980, pages 233-239.
Copyright © 1980 Elsevier. The definitive version is available at http://dx.doi.org/10.1016/0003-2670(80)87022-X.
NOTE: At the time of publication, the author Geraldine S.P. Ritchie was not yet affiliated with Cal Poly.
Abstract
The direct determination of aluminium in aqueous solutions by differential pulse polarography is described. If the pH is carefully controlled to 4.00 ± 0.01, there is a linear relationship between the peak height of the polarographic wave and the aluminium concentration up to 2.5 × 10-5 mol dm-3. The coefficient of variation is about 4% at the 10-5 mol dm-3 level. With increasing aluminium concentrations, the relationship ceases to be linear, and above 9 × 10-5 mol dm-3, the peak splits, probably because of hydrolysis and polymerisation. Na+, NH4+, Mg2+ and Ca2+ interfere at levels 100 times greater than that of the aluminium whereas Fe2+, Fe3+, Cu2+, Zn2+, Ni2+, NO3-, ClO4-, Cl- and SO42- do not interfere.
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