玻碳电极的石墨烯修饰研究及其电化学应用
首发时间:2014-10-27
摘要:为了提高重金属镉的测定速度,本研究利用玻碳电极进行石墨烯(GR)修饰,并应用于食品中镉的测定。采用滴涂法将氧化石墨烯修饰到玻碳电极表面,考察了电解质及pH值、修饰剂用量、富集时间和富集电位对镉离子检测的影响,并优化了检测条件,建立了测定大米制品中镉的差分脉冲伏安分析法(DPV)。结果表明镉离子的溶出峰电流与其浓度在4×10-7g/L~3×10-5g/L(R2=0.9925)范围内呈良好的线性关系,检测限为3.0×10-8g/L。使用石墨烯修饰电极对4.0×10-6g/L溶液平行测定6次的RSD为8.53%。石墨烯修饰玻碳电极体现出良好的稳定性、重现性以及抗干扰能力,本法是一种可靠、快捷、灵敏的检测方法,为快速监测食品中的镉元素提供基础方法。
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Electrochemically Reduced Graphene Modified Electrode and its electrochemical application
Abstract:We have modified a glassy carbon electrode by single-step electrodeposition of graphene(GR).And the electrochemical behavior on the electrode was investigated at the same time. The oxidation peak current of Cd(Ⅱ) increased at the R-GO/GCE compared with bare GCE. A sensitive and fast(differential pulse voltammetry, DPV) analysis method of Cd(Ⅱ) was established. Under the optimum conditions, a linear relationship exists between electrical current and the concentration of Cd(Ⅱ) in the range between 4×10-7g/L~3×10-5g/L ,with a detection limit of 3.0×10-8g/L. The studied method has been applied to the detection of Cd(Ⅱ) in rice with a successfully result, the average recoveries are between 96.25%~111.25%.
Keywords: graphene cadmium differential pulse voltammetry rice
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No.4614410998537141****
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