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A new, improved sensor for ascorbate determination at copper hexacyanoferrate modified carbon film electrodes

机译:用于在六氰基铁酸铜改性碳膜电极上测定抗坏血酸的新型改进传感器

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摘要

A new, improved sensor for the electrocatalytic determination of ascorbate has been developed that has both a low applied operating potential and a low detection limit. The sensor was constructed by depositing copper hexacyanoferrate film either electrochemically or chemically onto carbon film electrode, and it was then characterised by cyclic voltammetry and electrochemical impedance spectroscopy. Chemically deposited films were shown to be the best for ascorbate determination and were used as an amperometric sensor at +0.05 V versus SCE to determine ascorbate in wines and juice. The linear range extended to 5 mM with a limit of detection of 2.1 µM, the sensor was stable for more than four months, and it could be used continuously for at least 20 days.
机译:已经开发了一种新的,改进的用于抗坏血酸电催化测定的传感器,该传感器既具有较低的施加工作电位,又具有较低的检测极限。通过将六氰合铁酸铜膜电化学或化学沉积在碳膜电极上来构造传感器,然后通过循环伏安法和电化学阻抗谱对其进行表征。化学沉积膜显示出最适合抗坏血酸的测定,并被用作+ SCE的+ 0.05V下的安培传感器,用于测定葡萄酒和果汁中的抗坏血酸。线性范围扩展到5mM,检测限为2.1μM,传感器稳定超过四个月,可以连续使用至少20天。

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