title: The use of a graphite-castor oil polyurethane composite electrode for the determination of hydroquinone in photographic developers.
abstract: 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.
authors.affiliation: Departamento de Química, Universidade Federal de São Carlos, Via Washington Luís km 235, São Carlos, SP, Brazil.
authors.forename: Renata Kelly
authors.initials: RK
authors.lastname: Mendes
authors.forename: Priscila
authors.initials: P
authors.lastname: Cervini
authors.forename: Eder Tadeu Gomes
authors.initials: ET
authors.lastname: Cavalheiro