Adaptação de uma célula eletroquímica para microextração in situ: aplicação na eletroanálise de ciprofloxacina

Abstract

In this work, an electrochemical cell was adapted for in situ extraction and quantification of ciprofloxacin (CIPRO), an antibiotic of the fluoroquinolones class. The electrochemical system allowed the extraction and quantification, in the same device, the CIPRO present in the potable water sample, eliminating many of the steps used in conventional liquid-liquid microextraction (LLME). The advantage presented by the cell electrochemistry proposal is its convenience by enabling the processes of extraction and detection are carried out in the same vessel, in only one step, while the conventional LLME these processes are done in several steps which may result in loss of time and the analyte. It was used as extractants the high densities solvents such as eutectic solvents (Deep Eutectic Solvents - DES) and the use of these solvents in the aforesaid application also considered innovative, in addition to low cost and environmentally friendly — biodegradable and low toxic. The adaptation of the technical is promising because it allows the elimination of the various steps in a conventional MELL system, reduce analysis time and the probability of errors, making a reliable method and the possibility of future studies for on-site use (portability). For ensure the viability of application, ultrapure water samples and tap water were examined and, from the electroanalysis using differential pulse voltammetry, it was obtained satisfactory results in terms of pre-concentration and recovery of the analyte.