多壁碳纳米管负载铁氰化铜-铁修饰电极的制备及对亚硝酸根的测定

采用循环伏安法制备了多壁碳纳米管负载铁氰化铜-铁修饰复合陶瓷碳电极(CuFeHCF/MWCNT/CCE),研究了该修饰电极的电化学性质及对NO-2的电催化活性。 结果表明，该修饰电极对NO-2的电氧化具有强的催化活性，安培法检测NO-2的线性范围为2.0×10-7~1.4×10-3 mol/L，灵敏度为104.1 μA/(mmol·L-1)，检出限（3sb）为5.0×10-8 mol/L。 利用该方法测定了土壤中NO-2的含量，结果令人满意。

Preparation of Copper-iron Hexacyanoferrate Loaded Multi-walled Carbon Nanotubes Modified Electrode for the Determination of Nitrite

A copper-iron dual metal hexacyanoferrates(CuFeHCF), multi-walled carbon nanotube(MWCNT) modified composite ceramic carbon electrode(CCE)(CuFeHCF/MWCNT/CCE) was fabricated by using cyclic voltammetry. The electrochemical behavior and the electroctalytic activity of this modified electrode were also investigated carefully. The results show that the resulting modified electrode exhibits strongly electrocatalytic activity for the oxidation of nitrite. Based on this electrocatalytic property, an amperometry for the determination of nitrite was established. Under the optimum condition, the liner relationship between the catalytic current and the nitrite concentration is in the range of 2.0×10-7~1.4×10-3 mol/L. The sensitivity and the detection limit are 104.1 μA/(mmol·L-1) and 5.0×10-8 mol/L, respectively. The proposed method was applied to detect nitrite in real samples with satisfactory results.