Direct electrochemistry and electrocatalysis of nitrite based on nano-alumina-modified electrode |
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| Authors: | Qiong He Tian Gan Dongyun Zheng ShengShui Hu |
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| Institution: | (1) College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China;(2) Department of Chemistry, Qujing Normal College, Qujing, 655011, China;(3) State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Beijing, 100080, China; |
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| Abstract: | Simple and sensitive electrochemical method for the determination of nitrite, based on a nano-alumina-modified glassy carbon
electrode (GCE), is described. Nitrite yields a well-defined oxidation peak whose potential is 0.74 V at the nano-alumina-coated
GCE in 0.1 mol L−1 phosphate buffer (pH 5.0). Compared with bare GCE, the nano-alumina-modified GCE has evident catalytic effect towards the
oxidation of nitrite, and its peak current can be significantly enhanced. Some of the experimental parameters were optimized
for the determination of nitrite. The oxidation peak current was proportional to nitrite concentration in the range of 5.0 × 10−8–1.1 × 10−3 mol L−1, and a detection limit of 1.0 × 10−8 mol L−1 was obtained. This method has been successfully used to the determination of nitrite in sausage sample. Furthermore, results
obtained by the method have been compared with spectrophotometric method. |
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