以8-羟基喹啉为探针电化学测定铝离子  

Electrochemical determination of aluminum ions with 8-hydroxyquinoline as probe

作　　者：郭萌 马心英 王宜磊[2] 尹明静 陈美凤 朱琪 GUO Meng;MA Xin-ying;WANG Yi-lei;YIN Ming-jing;CHEN Mei-feng;ZHU Qi(College of Chemistry and Chemical Engineering,Heze University,Heze 274015,China;College of Agriculture and Bioengineering,Heze University,Heze 274015,China)

机构地区：[1]菏泽学院化学化工学院,山东菏泽274015 [2]菏泽学院农业与生物工程学院,山东菏泽274015

出　　处：《现代化工》2023年第7期237-241,共5页Modern Chemical Industry

基　　金：山东省高等学校协同创新计划;山东省自然科学基金联合专项(ZR2014BL020)。

摘　　要：为快速检测食品中铝添加剂含量,建立了以8-羟基喹啉为探针电化学测定铝离子的新方法。利用电化学聚合方法制备了聚L-瓜氨酸修饰电极(poly L-citline modified electrode,PLCit/GCE),与玻碳电极(glass carbonelectrode,GCE)相比,8-羟基喹啉在修饰后的电极上的电流响应信号显著增大。由于8-羟基喹啉与铝离子易形成配位化合物,向8-羟基喹啉溶液中加入铝离子时,会使8-羟基喹啉在PCLit/GCE上氧化峰电流减小,产生负相关,因此用8-羟基喹啉为探针可实现对铝离子的检测。利用循环伏安法研究了8-羟基喹啉在PLCit/GCE上的电流与铝离子浓度的线性关系。优化实验条件后,以8-羟基喹啉为探针对Al^(3+)进行测定,Al^(3+)浓度在8.00×10^(-8)~1.00×10^(-6)mol/L内时,与8-羟基喹啉氧化峰电流呈现良好的负相关线性关系,相关系数R=0.9938,检出限为6.00×10^(-8)mol/L。该方法用于蜂蜜中铝离子的测定,回收率为95.0%。In order to determine rapidly the content of aluminum additives in food,a new electrochemical method is developed for the determination of aluminum ion with 8-hydroxyquinoline as probe.Poly-L-citrulline modified electrode(PLCit/GCE)is prepared via electrochemical polymerization.Compared with glassy carbon electrode,the current response signal of 8-hydroxyquinoline on the modified electrode increases significantly.Because the coordination compounds are easily formed between 8-hydroxyquinoline and aluminum ions,the oxidation peak current of 8-hydroxyquinoline on PCLit/GCE will decrease and result in a negative correlation when aluminum ions are added into 8-hydroxyquinoline solution.Therefore,8-hydroxyquinoline can be used as probe to detect aluminum ions.The linear relationship between the current of 8-hydroxyquinoline on poly-L-citrulline modified electrode and aluminum ion concentration is studied by means of cyclic voltammetry method.8-Hydroxyquinoline is used as a probe to detect Al^(3+)after experimental conditions are optimized.The concentration of Al^(3+)within 8.00×10^(-8)-1.00×10^(-6)mol·L^(-1) shows a good negative linear correlation with the oxidation peak current of 8-hydroxyquinoline on the modified electrode.The correlation coefficient is 0.9938,and the detection limit is 6.00×10^(-8)mol·L^(-1).The recovery is 95.0%when this method is applied to detect aluminum ion in honey.

关 键 词：8-羟基喹啉 L-瓜氨酸 修饰电极 铝离子 

分 类 号：O65[理学—分析化学]