Graphite-silicone rubber composite electrode: Preparation and possibilities of analytical application.
Composite electrodes were prepared using graphite powder and silicone rubber in different compositions. The use of such hydrophopic materials interned to diminish the swallowing observed in other cases when the electrodes are used in aqueous solutions for a long time. The composite was characterized for the response reproducibility, ohmic resistance, thermal behavior and active area. The voltammetric response in relation to analytes with known voltammetric behavior was also evaluated, always in comparison with the glassy carbon. The 70% (graphite, w/w) composite electrode was used in the quantitative determination of hydroquinone (HQ) in a DPV procedure in which a detection limit of 5.1x10(-8)molL(-1) was observed. HQ was determined in a photographic developer sample with errors lower then 1% in relation to the label value.
de Oliveira
Aline Carlos
AC
Departamento de Química, Universidade Federal de São Carlos, C.P. 676, 13565-905 São Carlos, SP, Brazil.
dos Santos
Sidney Xavier
SX
Cavalheiro
Eder Tadeu Gomes
ET