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The use of a graphite-castor oil polyurethane composite electrode for the determination of hydroquinone in photographic developers |
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| Authors: | Mendes Renata Kelly Cervini Priscila Cavalheiro Eder Tadeu Gomes |
| Affiliation: | a Departamento de Química, Universidade Federal de São Carlos, Via Washington Luís km 235, C.P. 676, 13565-905, São Carlos, SP, Brazil b Departamento de Química e Física Molecular, Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 676, 13560-970 São Carlos, SP, Brazil |
| 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. |
| Keywords: | Hydroquinone Composite electrode material Graphite Polyurethane Photographic developers |
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