Miniaturized electrochemical measurement system for nitrate detection using renewable copper-clusters modified microelectrode

A miniaturized electrochemical measurement system for nitrate detection is presented. In the system, a renewable copper-clusters modified working electrode and a Pt counter electrode fabricated on a glass substrate by micro-electro-mechanical system technique were used to detect the concentration of nitrate in water. A low-noise, high-precision potentiostat module was designed to realize the electrode position of fresh copper onto the working electrode, the generation of linear sweep voltage and the detection of the response current with the magnitude of A-mA. STM32F407 microcontroller was applied to control the measuring process and display the detection results on a capacitive touch screen. The experimental results show that the developed system has a good linearity of 0.996 with the concentration of nitrate ranging from 0 to 71.4 molL-1. In comparison with the detection results by electrochemical workstation, the developed system has similar performances.