用稀土(镱)杂多酸盐/多壁碳纳米管修饰的玻碳电极测定亚硝酸根
Determination of Nitrite with the Modified Electrode of YbHS/MWCNT′s/GCE
摘 要
将多壁碳纳米管分散在镱(Ⅲ)杂多酸盐溶液中,将上述获得的悬浊液滴涂在玻碳电极表面,制备了镱(Ⅲ)杂多酸盐/多壁碳纳米管修饰的玻碳电极(YbHS-MWCNT′s/GCE).采用交流阻抗法对电极表面的性能进行了表征,采用循环伏安法对其电化学性能进行研究.研究发现,亚硝酸根在该修饰电极上出现一个氧化峰,氧化峰电位在-0.45 V处,提出了用循环伏安法测定亚硝酸根的方法.亚硝酸根的浓度在5.0×10-6~1.0×10-4mol·L-1范围内,氧化峰电流与其浓度呈线性关系.修饰电极用于环境水样中亚硝酸根离子的测定,回收率在97.2%~98.0%之间.
亚硝酸根
修饰电极
多壁碳纳米管
RE heteropoly acid salt
Nitrite
Modified electrode
Multi-wall carbon nanotube
Abstract
The modified electrode was prepared by dropping a suspension of multiwall nanocarbon tubes (MWCNT′s) in a solution of ytterbium salt of heteropoly acid (YbHS) onto the surface of glassy carbon electrode (GCE),which is abbreviated as YbHS/MWCNT′s/GCE.The surface property of the modified electrodes was characterized by AC impedance method,and its electrochemical property was studied by cyclic voltammetry.It was found that nitrite ion showed an oxidation peak at the potential of -0.45 V.Based on these findings,a selective method for determination of nitrite by cyclic voltammetry was proposed.Linear relationship between values of peak current and concentration of NO-2 was ranged from 5.0×10-6 to 1.0×10-4mol·L-1.The proposed method was used in the analysis of environmental water samples,giving values of recovery in the range of 97.2%-98.0%.
中图分类号 O657.1
所属栏目 工作简报
基金项目 遵义市科技局基金资助项目(遵市科合社字[2008]24号)和贵州省教育厅自然科学研究资助项目(黔教科2008068)
收稿日期 2008/12/20
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备注罗宿星(1984-),女,四川眉山人,硕士,讲师,主要从事催化化学方面的研究.
引用该论文: LUO Su-xing,WU Yuan-hui,GOU Hua. Determination of Nitrite with the Modified Electrode of YbHS/MWCNT′s/GCE[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2010, 46(3): 254～256
罗宿星,伍远辉,勾华. 用稀土(镱)杂多酸盐/多壁碳纳米管修饰的玻碳电极测定亚硝酸根[J]. 理化检验－化学分册, 2010, 46(3): 254～256
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