Eletroanálise de derivados acetaldeído com hidrazina e determinação em amostras de álcool combustível por voltametria de onda quadrada
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Undergraduate course
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Publisher
Sociedade Brasileira de Química
Type
Article
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Acesso aberto
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Abstract
A square wave voltammetric method is described for the determination of acetaldehyde using the derivatization reaction with hydrazine sulphate, based on the reduction of hydrazone generated as a product that exhibits a single well-defined peak at -1.19V in acetate buffer at pH 5. Calibration graphs were obtained from 1.0 x 10-6 mol L-1 to 10 x 10-6 mol L-1 of acetaldehyde, using a reaction time of 8 min and a hidrazine concentration of 0.02 mol L-1. The detection limit was 2.38 x 10-7 mol L-1. The method was applied satisfactorily to the determination of total aldehyde in fuel ethanol samples without any pre-treatment.
Description
Keywords
acetaldehyde derivatization, reduction of acetaldehyde, fuel ethanol analysis
Language
Portuguese
Citation
Química Nova. Sociedade Brasileira de Química, v. 29, n. 4, p. 662-665, 2006.
