丝网印刷修饰电极测量植物油的氧化诱导时间

摘要

制备了还原氧化石墨烯(rGO)、六氟磷酸1-丁基-3-甲基咪唑鎓(BMIMPF6)和石墨相氮化碳(g-C3N4)修饰丝网印刷电极(SPME).对SPME的修饰条件进行了优化,并采用循环伏安法和交流阻抗法对其电化学性能进行了表征.以1.0×10-3mol/L LiCl-乙醇和三氯甲烷的混合液(体积比20∶3)为支持电解质溶液,利用电化学交流阻抗法测量红花籽油、杏仁油、小麦胚芽油和橄榄油的氧化诱导时间.F值和t值检验结果表明,SPME测得的植物油氧化诱导时间与国标法所测结果无系统性误差.该方法较国标法更简便、快速和灵敏.%Screen printed electrodes were modified with reduced oxide graphene (rGO),1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) and graphite phase carbon nitride (g-C3N4).The SPME modification conditions were optimized and the electrochemical properties of the SPME were characterized by cyclic voltammetry and electrochemical impedance spectroscopy (EIS).The oxidation induction time of safflower seed oil,almond oil,wheat germ oil and olive oil were determined by EIS in the mixture of 1.0 × 10-3mol/L LiCl-ethanol and chloroform (V∶ V =20∶ 3) which was used as supporting electrolyte.F-test and t-test results showed that there was no significant difference of oxidation induction time between the proposed method and the national standard method.Moreover,the proposed method is more simple,rapid and sensitive than that of the national standard method.