Abstract
Erythromycin (ERY) belongs to a class of antibiotics that is one of the prior drinking water contaminants according to the latest European Union Water Framework Directive (EU – WDF). Therefore, the main goal of this study was to develop a new and sensitive analytical method for quantitative determination of ERY based on the use of screen-printed carbon electrodes (SPCEs) modified with sodium dodecyl sulfate. The electrochemical oxidation of ERY was investigated for the purpose of its flow-injection amperometric determination (in phosphate buffer solution pH 8.5) with a detection potential of 0.7 V. Using flow injection analysis (FIA) the modified SPCE showed a linear dynamic range up to 15 mg L−1 with a detection limit (3σ) of 0.14 mg L−1 (0.19 μM); (Ed = 0.7 V). The reproducibility of the amperometric detection with five different SPCEs was expressed as RSD with the achieved value of 2.99% for five successive injections of 5 mg L−1 of ERY and did not provide any memory effect. The proposed sensor is low-cost and easily applicable by user in real samples. Optimized method was applied for the electrochemical detection of ERY (i.e. for quality control analysis) in pretreated surface water samples using modified SPCEs in FIA mode.
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