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首页> 外文期刊>Electroanalysis >Flow injection analysis of chloramphenicol by using a disposable wall-jet ring disk carbon electrode
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Flow injection analysis of chloramphenicol by using a disposable wall-jet ring disk carbon electrode

机译：一次性壁喷式环形盘碳电极对氯霉素的流动注射分析

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摘要

A preanodized screen-printed ring disk carbon electrode was applied to the determination of chloramphenicol (Ph-NO2, CAP) by flow injection analysis (FIA). By setting up the first irreversible reduction reaction of Ph-NO2 to Pb-NHOH at the disk electrode, the following reversible oxidation of hydroxylamine (Ph-NHOH) to the nitroso (Ph-NO) derivative can be monitored/collected at the ring electrode for CAP analysis. The interference from dissolved oxygen and others can thus be avoided by using this approach and precise CAP determination can be easily performed by FIA under aerobic conditions. Preanodization treatment helps to lower the overpotential of the electrochemical reaction of CAP and favors the selective detection in aqueous medium. Under the optimum conditions, ten repetitive determinations at I mu M and 10 mu M CAP resulted in relative standard deviations of less than 4%, indicating good reproducibility of the system. A linear calibration range of 0.1 - 20 mu M with a detection limit of 0.074 mu M (S/N= 3) was obtained. Veterinary pharmaceutics were finally analyzed by this sensor to validate its practical applicability.
机译：通过流动注射分析（FIA），将预阳极氧化的丝网印刷环形盘碳电极用于氯霉素（Ph-NO2，CAP）的测定。通过在圆盘电极上建立第一个不可逆的Ph-NO2还原为Pb-NHOH的反应，可以在环电极处监测/收集随后的羟胺（Ph-NHOH）可逆氧化为亚硝基（Ph-NO）衍生物用于CAP分析。因此，使用这种方法可以避免来自溶解氧和其他物质的干扰，FIA可以在有氧条件下轻松进行精确的CAP测定。预阳极氧化处理有助于降低CAP电化学反应的过电位，并有助于在水性介质中进行选择性检测。在最佳条件下，在1μM和10μM CAP下进行10次重复测定，相对标准偏差小于4％，表明系统具有良好的重现性。线性校准范围为0.1-20μM，检测极限为0.074μM（S / N = 3）。最终，该传感器对兽药进行了分析，以验证其实际适用性。

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