The present invention relates to the field of electrochemical sensor, and is especially the method of detecting nitrate ion. In particular, a working electrode and a counter electrode are placed in a detection zone, Placing the nitrate ion selective electrode as the reference electrode in the area to be tested, connecting the test area to the area to be tested by means of salt bridge, applying constant voltage between the working electrode and the nitrate ion selective electrode to promote hydrogen peroxide to produce oxidation reaction on the working electrode to obtain oxidation current; The potential of the nitrate ion selective electrode is regulated by changing the concentration of nitrate to change the potential of the working electrode, thereby changing the oxidation current of hydrogen peroxide; According to the change of oxidation current of hydrogen peroxide, the concentration of nitrate radical can be measured. According to the invention, a traditional potential signal for measuring nitrate by the ion selective electrode is converted into a current signal, and the method has the characteristics of high selectivity of the ion selective electrode and high sensitivity of the current signal when used for detecting the nitrate. The method has the characteristics of high selectivity of the ion selective electrode and high sensitivity of the current signal.
; 秦伟
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