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Sensitive Quantification of Fe(III) in Food Samples at Screen Printed Carbon Electrode Modified with Graphene and Piroxicam by Catalytic Adsorptive Voltammetry
Electroanalysis ( IF 2.7 ) Pub Date : 2020-06-03 , DOI: 10.1002/elan.202060068 Susan Sadeghi 1 , Samaneh Ebadi 1
Electroanalysis ( IF 2.7 ) Pub Date : 2020-06-03 , DOI: 10.1002/elan.202060068 Susan Sadeghi 1 , Samaneh Ebadi 1
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A new disposable sensitive voltammetric sensor for the determination of Fe(III) based on a graphene (G) and piroxicam (Pir) modified screen printed carbon electrode (Pir/G/SPCE) has been developed. The developed method is based on accumulation of Fe(III) on the surface of the prepared sensor strip, formation a complex with Pir and subsequent reduction the adsorbed chelated Fe(III) at −0.03 V (vs. Ag/AgCl) coupled with the catalytic enhancement of bromate. Characterizations of the modified electrode surface were performed by field emission scanning electron microscopy (FE‐SEM), energy dispersive X‐ray spectroscopy (EDX) and electrochemical impedance spectroscopy (EIS). Electrochemical behavior of the modified SPCEs was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under the optimum conditions, the catalytic voltammetric method exhibited linear calibration plot in the concentration ranges of 1–100 ng mL−1 and 100–3500 ng mL−1 Fe(III) with a limit of detection of 0.3 ng mL−1. The sensor strip displayed good reproducibility with 1.7 % relative standard deviation (RSD%). The developed method was successfully applied for the determination of iron in food samples such as vegetables, fruit, and cereal.
中文翻译：
催化吸附伏安法在石墨烯和吡罗昔康修饰的丝网印刷碳电极上对食品中的Fe（III）进行灵敏定量
一种基于石墨烯（G）和吡罗昔康（Pir）修饰的丝网印刷碳电极（Pir / G / SPCE）的用于测定Fe（III）的新型一次性灵敏伏安传感器已经开发出来。所开发的方法基于Fe（III）在准备好的传感器条表面上的积聚，与Pir形成络合物并随后在-0.03 V（vs. Ag / AgCl）还原吸附的螯合Fe（III）并结合溴酸盐的催化增强。通过场发射扫描电子显微镜（FE‐SEM），能量色散X射线光谱（EDX）和电化学阻抗谱（EIS）对修饰的电极表面进行表征。通过循环伏安法（CV）和差分脉冲伏安法（DPV）研究了改性SPCE的电化学行为。在最佳条件下-1和100–3500 ng mL -1 Fe（III），检出限为0.3 ng mL -1。传感器条显示出良好的重现性，相对标准偏差（RSD％）为1.7％。该方法成功用于蔬菜，水果和谷物等食品中铁的测定。
更新日期：2020-06-03
中文翻译：
催化吸附伏安法在石墨烯和吡罗昔康修饰的丝网印刷碳电极上对食品中的Fe（III）进行灵敏定量
一种基于石墨烯（G）和吡罗昔康（Pir）修饰的丝网印刷碳电极（Pir / G / SPCE）的用于测定Fe（III）的新型一次性灵敏伏安传感器已经开发出来。所开发的方法基于Fe（III）在准备好的传感器条表面上的积聚，与Pir形成络合物并随后在-0.03 V（vs. Ag / AgCl）还原吸附的螯合Fe（III）并结合溴酸盐的催化增强。通过场发射扫描电子显微镜（FE‐SEM），能量色散X射线光谱（EDX）和电化学阻抗谱（EIS）对修饰的电极表面进行表征。通过循环伏安法（CV）和差分脉冲伏安法（DPV）研究了改性SPCE的电化学行为。在最佳条件下-1和100–3500 ng mL -1 Fe（III），检出限为0.3 ng mL -1。传感器条显示出良好的重现性，相对标准偏差（RSD％）为1.7％。该方法成功用于蔬菜，水果和谷物等食品中铁的测定。
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