| 摘要: |
| 用钯纳米粒子多壁碳纳米管修饰玻碳电极,并用于对六价铬(Cr(VI))的电化学测定.采用场发射扫描电子显微镜、循环伏安法、交流阻抗法、差分脉冲伏安法等方法对修饰电极进行了表征.研究发现多种其他金属离子如Cr3+、Pd2+、Zn2+、Pb2+、Cu2+、Al3+、Ba2+、Ca2+、Mg2+等对六价铬离子的测定没有明显干扰,且六价铬的还原峰电流与Cr(VI)的浓度在8×10-7~5×10-8mol/L范围内呈良好线性关系,检测限达2.7×10-8mol/L.该法具有简便快速,选择性好,灵敏度高等特点. |
| 关键词: 六价铬Cr(VI) 钯纳米粒子 多壁碳纳米管 电化学 修饰电极 |
| DOI： |
| 分类号: |
| 基金项目:上海师范大学食品安全与营养创新团队发展计划(DXL123) |
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| Preparation of palladium nanoparticles and carboxylated MWNTs modified glassy carbon electrode and its application for the electrochemical determination of Cr (VI) |
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YANG Shuai, TANG Wanxin, ZHANG Chao, ZHU Ningning
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College of Life and Environmental Sciences,Shanghai Normal University
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| Abstract: |
| This study described a simple and rapid method for the electrochemical determination of Cr (VI) based on palladium nanoparticles and carboxylated multi-walled carbon nanotubes (MWNTs) modified glassy carbon electrode (GCE) (written as PdNPs-MWNT/GCE) .The prepared PdNPs-MWNT/GCE was characterized by FE-SEM,CV,EIS and DPV.It was found that many other metal ions such as Cr3+,Pd2+,Zn2+,Pb2+,Cu2+,Al3+,Ba2+,Ca2+,Mg2+ had no influence on Cr (VI) determination.Under the optimal conditions,the reduction current of Cr (VI) increased linearly with increasing the concentration of Cr (VI) in the range of 8×10-7~ 5×10-8mol/L with a correlation coefficient of 0.9960,and the detection limit of 3×10-8mol/L (based on S/N=3).The present method has the following advantages such as simple,rapid,good selectivity and sensitivity. |
| Key words: Cr (VI) PdNPs MWNTs electrochemical modified electrode |
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