▎ 摘　　要

NOVELTY - Detecting trivalent arsenic in soil based on electrochemical doping of nano-sensing channels involves synthesizing nano-sensing materials with semiconductor properties and catalytic properties for the electroreduction of trivalent arsenic, modifying the nano-sensing material on a specific substrate, constructing a nano-sensing channel, and adjusting the semiconductor and catalytic properties of the nano-sensing channel, and adding wires and pins to prepare sensor parts for trivalent arsenic detection. A strong acid is used as a supporting electrolyte to process samples to be tested with different concentrations of trivalent arsenic, and the processed solution to be tested is dripped onto the test area centered on the nano-sensing channel. A reduction potential is applied to the nano-sensing channel, and trivalent arsenic is deposited into the nano-sensing channel by electro-reduction, and the electrochemical doping of nano-sensing channels is obtained. USE - Method for detecting trivalent arsenic in soil based on electrochemical doping of nano-sensing channels. ADVANTAGE - The method uses sensor that does not need to modify the biological identification element. The method has fast response, low cost, and strong anti-interference ability. The monitoring method has simple operation, which can provide technical support for new soil heavy metal detection device and soil heavy metal fast detection method. DETAILED DESCRIPTION - Detecting trivalent arsenic in soil based on electrochemical doping of nano-sensing channels involves synthesizing nano-sensing materials with semiconductor properties and catalytic properties for the electroreduction of trivalent arsenic, modifying the nano-sensing material on a specific substrate, constructing a nano-sensing channel, and adjusting the semiconductor and catalytic properties of the nano-sensing channel, and adding wires and pins to prepare sensor parts for trivalent arsenic detection. A strong acid is used as a supporting electrolyte to process samples to be tested with different concentrations of trivalent arsenic, and the processed solution to be tested is dripped onto the test area centered on the nano-sensing channel. A reduction potential is applied to the nano-sensing channel, and trivalent arsenic is deposited into the nano-sensing channel by electro-reduction, and the electrochemical doping of nano-sensing channels is obtained. The voltage-current curve of the source and drain of the sensor device are tested at a specific gate voltage, and the voltage-current curve of the drain and gate of the sensor device is tested under a specific source voltage. An oxidation potential is applied to the nano-sensing channel to remove elemental arsenic doped in the nano-sensing channel, and the nano sensing channel in the nano sensing device is activated. The carrier concentration and transfer rate changes of the nano-sensing channel are tested before and after electrochemical doping with different concentrations of trivalent arsenic. The resistance of the nano-sensing channel is calculated through the voltage-current curve between the source and drain, and a prediction model is established based on the concentration of trivalent arsenic and the rate of change of the resistance of the nano-sensing channel. The soil sample extract is dropped onto the nano-sensing channel, and the resistance change rate of the nano-sensing channel after electrochemical doping is collected. The prediction model is used to determine the trivalent arsenic concentration in the soil sample.