石墨烯-壳聚糖/金纳米粒子修饰电极同时测定亚硫酸根和亚硝酸根  

Simultaneous Electrochemical Determination of Sulphite and Nnitrite Using a Gold Nanoparticle/Graphene-Chitosan Modified Electrode

作　　者：汪雪[1] 李辉[2] 吴敏[1] 葛淑丽[1] 朱妍[1] 王清江[1] 何品刚[1] 方禹之[1] 

机构地区：[1]华东师范大学化学系,上海200241 [2]上海交通大学化学化工学院,上海200240

出　　处：《分析化学》2013年第8期1232-1237,共6页Chinese Journal of Analytical Chemistry

基　　金：新世纪优秀人才支持计划(No.NCET-08-0191);国家重大科学仪器设备开发专项(No.2011YQ150072)资助

摘　　要：采用滴涂法得到了石墨烯(GR)-壳聚糖(CS)修饰的玻碳电极(GCE),再采用电沉积的方法将HAuCl4直接还原成金纳米粒子,沉积在GR-CS表面,制得了GR-CS/AuNPs GCE修饰电极。采用透射电子显微镜(TEM)分别对制备的GR和构建的修饰电极GR-CS/AuNPs GCE进行了形貌表征。用循环伏安法研究了SO32-和NO2-在GR-CS/AuNPs GCE上的电化学行为。结果表明,此修饰电极对SO32-和NO2-均有较好的电催化活性作用,并且能实现对两种物质的同时测定,SO32-和NO2-在该修饰电极上的线性范围分别为5～410μmol/L和1～380μmol/L,检出限(S/N=3)分别为1.0和0.25μmol/L。GR-CS/AuNPs GCE具有很好的稳定性、重现性和灵敏度。此电极用于实际水样的SO32-和NO2-的含量测定,回收率为97.2%～102.6%,结果令人满意。A highly sensitive electrochemical sensor for the simultaneous determination of SO32- and NO2- based on a glassy carbon electrode（GCE） modified with grapheme（GR）-chitosan（CS） and gold nanoparticles（AuNPs） has been developed.The GR and GR-CS/AuNPs GCEs were characterised using a transmission electron microscope（TEM）.The electrochemical behaviours of SO2- and NO2- at the GR-CS/AuNPs GCE were investigated using cyclic voltammetry（CV）.The chemically modified electrode displayed excellent electrochemical catalytic activities towards sulphite and nitrite.Linear relationships between the values of the oxidation peak current and the concentration of SO2- and NO2- were obtained in the ranges of 5-410 μmol/L（R=0.9986） and 1-380 μmol/L（R=0.9940） with detection limits（S/N=3） of 1 μmol/L and 0.25 μmol/L,respectively.This GR-CS/AuNPs GCE showed many advantages in terms of stability,sensitivity,facility and economy.The proposed method was employed to analyze real samples with recoveries of 97.2% to 102.6%.

关 键 词：石墨烯 壳聚糖 金纳米粒子 亚硝酸根 亚硫酸根 

分 类 号：O657.1[理学—分析化学]