Resumo

BENITEZ-FERNANDEZ, Daniel et al. Voltammetric method for cadmium analysis in wastewater. Rev Cub Quim [online]. 2021, vol.33, n.3, pp. 415-436.  Epub 26-Out-2021. ISSN 2224-5421.

The validation of a stripping voltammetric method for the cadmium quantification in wastewater using the built potentiostat is presented. Stability of current intensity was observed in KCl 1 mol/L and in acetic acid/acetate buffer, setting 10s as the sampling time. At pH 5 and -1300 mV an increasing of the peak current was observed, and the electrodeposition time did not show significative influence. The linear range was 6·10-5 - 5·10-4 mol/L. The detection and quantification limits were 10-5 mol/L and 5·10-5 mol/L. The method presented coefficients of variation for repeatability between 3 and 3, 9% and with statistical homogeneity in different days. The recovery percentage was 102 ± 4,83 %. The associated uncertainty with concentration was 1,3∙10-5 - 1,2∙10-6 mol/L. The quantification of samples of wastewater showed a cadmium concentration of 199 ± 8,9 mg/L, with a variation coefficient of 4,5 %.

Palavras-chave : cadmium; anodic stripping; minimal instrumentation.

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