Journal of the Brazilian Chemical Society
versión impresa ISSN 0103-5053
MARTINS, Valdomiro L.; GALVAO, Roberto K. Harrop; ARAUJO, Mário César U. de y GAIAO, Edvaldo da Nóbrega. Wavelet-Based determination of Cu and Pb in water samples using potentiometric stripping analysis with a Lab-Made potentiostat. J. Braz. Chem. Soc. [online]. 2009, vol.20, n.8, pp. 1561-1564. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50532009000800025.
This paper demonstrates the possibility of simultaneously determining lead and copper in mineral, river and tap water by potentiometric stripping analysis using a low-cost lab-made potentiostat and a wavelet-based signal processing method. Pb(II) and Cu(II) concentrations were found to be in the range 3-7 µg L-1. Relative standard deviations were on average smaller than 3%, which is satisfactory in view of the trace concentration. For comparison, the determination was also carried out by using a high-end commercial equipment (μAutolab Type II, Eco Chemie). The average and standard deviation of the results were similar to those obtained with the lab-made potentiostat. No significant statistical difference was verified according to a paired t-test at a confidence level of 95%.
Palabras llave : potentiometric stripping analysis; wavelet transform; lead; copper; water analysis.