Amperometric nitrite sensor based on a glassy carbon electrode modified with multi-walled carbon nanotubes and poly(toluidine blue)
文献类型： 外文期刊
作者： Dai, Juan 1 ; Deng, Dongli 1 ; Yuan, Yali 3 ; Zhang, Jinzhong 1 ; Deng, Fei 1 ; He, Shuang 1 ;
作者机构： 1.Southwest Univ, Coll Resources & Environm, Minist Educ, Key Lab Ecoenvironm Gorges Reservoir Reg 3, Chongqing 400715, Peoples R China
2.Chongqing Ind Polytech Coll, Fac Chem & Pharmaceut Engn, Chongqing 401120, Peoples R China
3.Southwest Univ, Coll Chem & Chem Engn, Chongqing 400715, Peoples R China
4.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China
关键词： Cyclic voltammetry;Scanning electron microscopy;Amperometry;Electrocatalytic oxidation;Electropolymerization;Nanocomposite;Greenhouse soil
期刊名称：MICROCHIMICA ACTA （ 影响因子：5.3； 五年影响因子：5.0 ）
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收录情况： SCI
摘要： An amperometric nitrite sensor modified with multi-walled carbon nanotubes (MWCNTs) and poly(toluidine blue) (PTB) on glassy carbon electrode was constructed. The surface morphology of the composite- modified electrode was characterized by scanning electron microscopy, and the electrochemical response behavior and electrocatalytic oxidation mechanism of nitrite were investigated by cyclic voltammetry. The high surface-to-volume ratio of MWCNTs and PTB brings the electrochemical sensing unit and nitrite in full contact. This renders the electrochemical response extremely sensitive to nitrite. Under the optimal measurement conditions and a working voltage of 0.73 V (vs. SCE), a linear relationship is obtained between the oxidation peak current and nitrite concentration in the range of 39 nM-1.1 mM, and the limit of detection is lowered to 19 nM (at an S/N ratio of 3). The sensor was successfully applied to the determination of nitrite in greenhouse soils.
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