Resumo

ROJAS, C. L.. Trace Determination of Palladium in Environmental Samples by Adsorptive Voltammetry . Port. Electrochim. Acta [online]. 2005, vol.23, n.2, pp.333-352. ISSN 0872-1904.

The objective of the present work is the study and optimization of a voltammetric methodology to determine palladium traces and ultratraces, with the purpose of being able to establish the environmental levels of this element and to verify if a contamination takes place starting from the gases of escape of the vehicles equipped with catalytic converters. The voltammetric determination of palladium is based in the formation of a complex of palladium with dimethylglyoxime that adsorbes actively on the surface of a hanging mercury drop electrode, for then to be reduced when making the square wave potential sweep. The quantification is made by the method of standard additions. The study of interferences demonstrated that Na⁺, Mg²⁺, K⁺, Ca²⁺, Zn²⁺, Cu²⁺ and Al³⁺ are not even interferences at the level of 10 mg/L. The detection and quantification limits of the methodology are respectively 10 ng/L and 33 ng/L, with a sensibility of (4.3±0.8)*10² nA L/ng.

Palavras-chave : palladium; ultratraces; voltammetry; determination; environmental.

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