一氧化氮在水杨醛谷氨酸合镍修饰碳黑微电极上的电催化氧化

Electrocatalytic Oxidation of Nitric Oxide at Carbon Black MicroelectrodeModified with Nickel Complex of N-Salicylidene Glutamic Acid

制备了水杨醛谷氨酸合镍修饰碳黑微电极，试验了修饰电极对一氧化氮的电催化氧化性能。试验结果表明，在pH6．8的磷酸盐中，一氧化氮在该电极上的线性范围为4．0×10^-8～1．0×10^-5mol·L^-1；检出限（3σ）为1．0×10^-8mol·L^-1。将此电极用于3种模拟样品的分析，并在此基础作回收率试验，测得RSD（n=8）值在1．90～2．8％之间，回收率在97%～105%间。在一氧化氮浓度1．0×10^-6mol·L^-1的水平上进行精密度试验，测得RSD（n=10）为2．2％。

Preparation of carbon black microelectrode modified with nickel complex of N-salicylidene glutamic acid was described and electrocatalylic oxidation behavior of nitric oxide （NO） at the electrode was studied. As shown by the experimental results, in a phoshpate buffer medium of pH 6. 8, linear relationship was found between the catalytic peak current and concentration of nitric oxide in the range of 4.0× 10 ^-8- 1.0× 10^-5mol· L^-1 with a detection limit （3σ） of 1.0× 10^-8mol · L^-1. Precision was tested at the concentration level Of 1.0×10^-6mol · L^-1 of NO, the value of RSD＇s （n=10） obtained was 2. 2%. In its application to the analysis of 3 simulated samples, the values of RSD＇s （n=8） and recovery found were in the ranges of 1.9%-2. 8% and 97%-105% respectively.