Interdigital electrode array sensor used for quantitatively detecting residual chlorine in water

Abstract

The invention relates to the field of water quality detection sensors, in particular to an interdigital electrode array sensor used for quantitatively detecting residual chlorine in water. The sensorcomprises an interdigital electrode and an ion selectivity film, wherein the ion selectivity film directly covers the surface of the interdigital electrode in a sensor; the interdigital electrode is formed in a way that two groups of parallel metal electrode arrays are staggered; the ion selectivity film selectively reacts with hypochlorite in water; and a chemical signal is converted into an electric potential signal through the sensor. Compared with an existing residual chlorine detection method, the sensor utilizes the interdigital electrode sensor for detection, the signal to noise ratio of a miniature interdigital electrode array is greatly improved than the signal to noise ratio of the voltage and current signal of a traditional electrode, so that detection accuracy is higher, drifting is unlikely to happen, and online monitoring can be carried out for a long time. In addition, due to the ion selectivity film, the sensor is unlikely to be disturbed and polluted by other ions, andthe stability and the accuracy of the sensor are improved.

Description

technical field [0001] The invention relates to the field of water quality detection sensors, in particular to a miniature sensor that uses an interdigitated electrode array and uses potential signals to quantitatively detect residual chlorine in water. Background technique [0002] Residual chlorine is one of the important parameters to measure water quality. It refers to the effective chlorine remaining in the water body after the water has been chlorinated and disinfected for a period of time. Real-time and accurate determination of residual chlorine and existing state content in effluent water is of great economic and social importance for the monitoring of drinking water pipe network systems, swimming pool water quality testing, disinfection process monitoring of power plant boiler control box cooling systems, and residual concentration monitoring in wastewater treatment. benefit. [0003] At present, the determination methods of residual chlorine in water are generall...

AI Technical Summary

Problems solved by technology

DPD spectrophotometry is a standard method for residual chlorine detection. It utilizes the color reaction between chemical reagents and residual chlorine, uses a photoelectric sensor to measure its absorbance, and obtains the residual chlorine content. However, the operation of the spectrophotometric method is poor, and the operation interface is not friendly. monitoring requirements

The redox electrode method in the electrochemical sensor detection method needs to apply a very low voltage between the cathode and anode electrodes, and there will be a current flow during the redox process, which makes it difficult to control the stability of the voltage during operation; the "current" electrode method Although there is no need to apply any voltage across the electrodes, the two electrodes are exposed to water and are easily contaminated, resulting in a large difference between the detected value and the true value

In recent years, although a variety of residual chlorine online detection devices have appeared, the detection method is essentially the traditional electrode detection method, which cannot avoid the above problems

For example, the application number is 201310571788.7, which adopts the residual chlorine sensor containing electrolyte solution and three-electrode detection head in the film, and the detection essence still adopts the traditional three-electrode method, and the accuracy and service life cannot be guaranteed; the application number is 201511030796.6, and a The online residual chlorine sensor has a complex structure and still uses traditional electrodes. During the test, hydrochloric acid is added to clean the electrodes. Although the test accuracy has been improved, the defects of the traditional electrodes cannot be eliminated.

Images