The use of a graphite-castor oil polyurethane composite electrode for the determination of hydroquinone in photographic developers.
The performance of a new graphite-castor oil polyurethane composite electrode in the determination of hydroquinone in photographic developers in a differential pulse voltammetric (DPV) procedure is described. The 60% (graphite, w/w) composite electrode presented good stability, repeatability and accurate response. Limit of detection of 934 nmol L(-1) was observed for hydroquinone within a linear dynamic range from 66 to 530 nmol L(-1). The determination of hydroquinone in a photographic developer sample showed agreement with the label values in a 95% confidence level with maximum 2% relative error and recoveries between 100.1 and 100.4%. No need of sample preparation was required since the p-methylaminophenolsulfate (metol) present in the developer formulation did not interfered in the measurements.
Mendes
Renata Kelly
RK
Departamento de Química, Universidade Federal de São Carlos, Via Washington Luís km 235, São Carlos, SP, Brazil.
Cervini
Priscila
P
Cavalheiro
Eder Tadeu Gomes
ET