Enhancement of voltammetric determination of quinizarine based on the adsorption at surfactant-adsorbed-layer in disposable electrodes

Autor(es)

Goncalves Trindade, Magno Aparecido ^[1] ; Bilibio, Uendinara ^[1] ; Boldrin Zanoni, Maria Valnice ^[2]

Afiliação do(s) autor(es)

^[1] Fed Univ Grande Dourados, Fac Sci & Technol, BR-79804970 Dourados, MS - Brazil

^[2] Sao Paulo State Univ UNESP, Dept Analyt Chem, Inst Chem, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FUEL; v. 136, p. 201-207, NOV 15 2014.
• Citações Web of Science: 11

Resumo

Screen-printed carbon electrode (SPCE) surface was easily altered through spontaneous hydrophobic interactions with cationic surfactant cetyltrimethylammonium bromide (CTAB) to form a surfactant-adsorbed-layer. This finding combined the practicality of the SPCE with the CTAB's anti-fouling ability and preconcentration properties as a suitable alternative to determine the quinizarine in fuel samples using the square-wave voltammetric technique. Under optimized experimental conditions the electroanalytical method presented a linear response from 5.00 x 10(-7) to 6.00 x 10(-6) mol L-1 (r = 0.998) with a detection limit of 2.70 x 10(-7) mol L-1. The methodology was successfully applied in the dye marker quantification in diesel oil and kerosene samples, without matrix interference, with recoveries values highly satisfactory and ranged between 84.0% and 98.7%. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 05/00382-4 - Análise de corantes marcadores de combustíveis utilizando-se métodos eletroanalíticos
• Beneficiário: Magno Aparecido Gonçalves Trindade
• Modalidade de apoio: Bolsas no Brasil - Doutorado