Simple and direct potentiometric determination of potassium ions in biodiesel microemulsions at a glassy carbon electrode modified with nickel(II) hexacyanoferrate nanoparticles

Nenhuma Miniatura disponível

Data

2013-01-01

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Royal Soc Chemistry

Tipo

Artigo

Direito de acesso

Acesso restrito

Resumo

Considering the great importance of the determination of inorganic ions present in fuels, particularly in relation to potassium, the scope of this work was to develop a potentiometric method using a chemically modified electrode with nanoparticles of nickel hexacyanoferrate for the determination of potassium ions in a microemulsion of biodiesel. The electrochemical studies showed the possibility of electrochemical measurements in biodiesel microemulsion and the good stability of the modified electrode in this medium. The modified electrodes (surface excess of 16.1 +/- 1.6 nmol cm(-2)) in a microemulsion composed of biodiesel : propan-1-ol : aqueous phase (5 : 70 : 25 in volume) exhibited a detection limit for potassium ions of 5.3 x 10(-5) mol L-1 and a slope of 58 mV, with a linear response in the concentration range of 5.0 x 10(-5) mol L-1 to 1.0 x 10(-2) mol L-1. The recoveries obtained were between 91 and 106%. Thus, the proposed method using the preparation of a microemulsion of the samples proved to be an efficient method for the determination of potassium in biodiesel.

Descrição

Palavras-chave

Idioma

Inglês

Como citar

Analytical Methods. Cambridge: Royal Soc Chemistry, v. 5, n. 16, p. 4145-4151, 2013.

Itens relacionados