Abstract:The present work presents a simple and didactic approach regarding some concepts involved in voltammetric techniques, starting from some basic principles of electrochemistry and advancing to the field of electroanalysis, passing through a discussion of mass transport phenomena, and culminating in a breakdown between different types of voltammetric techniques.Keywords: Voltammetry; electrochemical; mass transport. ResumoO presente trabalho apresenta uma abordagem simples e didática sobre conceitos envolvidos nas técnicas voltamétricas, partindo de alguns princípios básicos de eletroquímica e avançando para o campo da eletroanálise, passando por uma discussão sobre os fenômenos de transporte de massa e culminando numa classificação entre os diferentes tipos de técnicas voltamétricas.Palavras-chave: Voltametria; eletroquímica; transporte de massa.

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Anodic stripping voltammetry and bismuth film electrode (BFE) were used to develop a method for the determination of lead in a complex sample (kerosene) prepared as a stable microemulsion. The method allowed the sensitive determination of lead with a quantification limit, in the sample, of 1.4 Â 10 À7 mol L À1 employing a 240 s accumulation time. Fortified sample analysis enabled the average analyte recovery around 99% which was statistically similar to the one achieved using a reference method (atomic absorption spectrometry). A detailed metrological evaluation was made including the calculation of the uncertainty associated to the voltammetric measurement indicating that repeatability (variations in the formation of different films and in the behavior of the analyte in the prepared microemulsions) is the main contribution of measurement uncertainty.

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