| 碳纳米管修饰电极伏安法测定茶碱 |
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| 引用本文： | 张钱丽,陈三多,柯荣锋.碳纳米管修饰电极伏安法测定茶碱[J].苏州科技学院学报(自然科学版),2011,28(1):30-33. |
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| 作者姓名： | 张钱丽 陈三多 柯荣锋 |
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| 作者单位： | 苏州科技学院,化学与生物工程学院,江苏,苏州,215009 |
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| 基金项目： | 苏州科技学院科研基金资助项目(Z1332); 南京大学“生命分析化学教育部重点实验室”开放课题基金资助项目(KLACLSO8012) |
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| 摘 要： | 以碳纳米管修饰碳圆盘微电极为工作电极,铂丝为对电极,Ag/AgCl电极为参比电极,研究了茶碱在碳纳米管修饰电极上的电化学行为,化学修饰电极与裸电极相比,电流响应明显提高。在0.01 mol.L-1的硫酸溶液中-0.4 V的电压富集30 s,阳极化扫描,在1.1 V处有一灵敏的氧化峰,氧化峰电流和茶碱浓度在5.0×10-6~1.0×10-4 mol.L-1范围呈良好的线性关系,检测限为6×10-7 mol.L-1。对5.0×10-5 mol.L-1茶碱进行了6次的连续重复测定,相对标准偏差为1.79%,表明修饰电极稳定性良好,表面易于更新。此法用于茶叶样品中茶碱含量的测定结果满意。
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| 关 键 词： | 茶碱 碳圆盘微电极 碳纳米管 伏安法 |
The voltammetric determination of theophylline on carbon nanotube modified electrode |
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| ZHANG Qianli,CHEN Sanduo,KE Rongfeng.The voltammetric determination of theophylline on carbon nanotube modified electrode[J].Journal of University of Science and Technology of Suzhou,2011,28(1):30-33. |
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| Authors: | ZHANG Qianli CHEN Sanduo KE Rongfeng |
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| Institution: | ZHANG Qianli,CHEN Sanduo,KE Rongfeng(School of Chemistry and Bioengineering,SUTS,Suzhou 215009,China) |
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| Abstract: | A nanotube modified carbon-disc microelectode was reported for the determination of trace amounts of theophylline.The electrochemical behavior of theophylline was studied by cyclic voltmmetry.Compared to a bare electrode,the modified electrode exhibited a marked enhancement of the current response.In 0.01 mol·L-1 H2SO4 solution,theophylline was accumulated at-0.4 V for 30 s and the liner range was from 5.0×10-6 to 1.0×10-4 mol·L-1 with a detection limit of 6×10-7 mol·L-1.Six successive determinations of 1.0×10-5 mol·L-1 theophylline resulted in a relative standard deviation of 1.79% for the current response,indicating that the electrode renewal gives a good reproducible surface.This method has been applied to the determination of theophylline in samples with satisfied results. |
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| Keywords: | theophyllin carbon-disc microelectrode carbon nanotube voltammetry |
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