A cubic silsesquioxane modified with purpald (r) : preparation, characterization and a voltammetric application for determination of sulfite

Soares, Layciane Aparecida [UNESP]; Wang Yingzi; Serantoni da Silveira, Tayla Fernanda [UNESP]; Silvestrini, Daniela Rodrigues [UNESP]; Bicalho, Urquisa de Oliveira [UNESP]; Dias Filho, Newton Luiz [UNESP]; Carmo, Devaney Ribeiro do [UNESP]

A cubic silsesquioxane modified with purpald (r) : preparation, characterization and a voltammetric application for determination of sulfite

Arquivos

WOS000323546100008.pdf (656.17 KB)

Data

2013-06-01

Autores

Soares, Layciane Aparecida

Wang Yingzi

Serantoni da Silveira, Tayla Fernanda

Silvestrini, Daniela Rodrigues

Bicalho, Urquisa de Oliveira

Dias Filho, Newton Luiz

Carmo, Devaney Ribeiro do

Editor

Esg

Tipo

Artigo

Direito de acesso

Acesso aberto

Resumo

A novel composite formed by interaction of a octa(3-chloropropyl)octasilsesquioxane modified with Purpald(R), and its subsequent reaction with silver and hexacyanoferrate (III) (AgHSP), was synthesized and initially characterized by Fourier transform infrared spectra (FTIR) and cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with AgHSP, showed one redox couple with formal potential E-theta'=0.64V (vs Ag/AgCl, KNO3, 1.0 mol L-1; v = 20 mV s(-1)), attributed to the Fe2+(CN)(6)/Fe3+(CN)(6) process. The redox couple presents an electrocatalytic response for determination of sulfite. The modified electrode showed a linear response from 7.0x10(-5) to 1.0x10(-3) mol L-1 with the corresponding equation Y(mu A) = 18.05 + 29.983x10(3) [sulfite], and a correlation coefficient of r=0.999. The method showed a detection limit of 0.115x10(-4) mol L-1 with a relative standard deviation of +/- 4% (n = 3) and amperometric sensitivity of 29.983x10(-3)A mol L-1. The modified electrode showed a excellent stability and good reproducibility during experiments.