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

An electrode sensor, electrode array technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of poor spectrophotometry operation, complex structure, differences, etc., to improve stability and accuracy, reduce system costs, and detect high precision effect

Pending Publication Date: 2019-07-12
ZHANGJIAGANG ONECHIP BIO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1A

[0031] as attached Figure 1-2 The structure of a square interdigitated electrode sensor shown is: there are two groups of electrodes on the insulating substrate 1 (ie, the first parallel metal electrode array electrode 2 and the second parallel metal electrode array electrode 3), and each group of electrodes is composed of A plurality of parallel metal electrodes 4 with a width of 1-100 microns, an interval of 1-100 microns, and a length of 100 microns to 5 mm are interlaced to form a comb-shaped double-electrode structure; the comb teeth of the two groups of electrodes are inserted into the gaps between adjacent comb teeth of the other Among them, a square electrode is formed; a layer of ion-selective film 5 is deposited on the double-electrode structure (that is, a structure composed of two sets of electrodes); there are pads 6 at both ends of the double-electrode to connect to the external circuit; the length and width of the square electrode can range from 1 to 10 mm.

Embodiment 1B

[0033] Such as image 3 The structure of another kind of circular interdigitated electrode shown is: there are two groups of 100 micron wide concentric circle metal electrodes 7 on the insulating substrate 1, and the two groups of electrodes are the first parallel metal electrode array electrode 2 and the second parallel metal electrode array electrode 7. The metal electrode array electrodes 3 are staggered to form a double-electrode structure with a line spacing of 100 microns; the diameter of the circular electrode is 1 to 10 mm; each of the two electrodes has a pad 6 to connect to the external circuit; a layer of metal is deposited on the double-electrode structure Ion-selective membranes5.

Embodiment 2

[0035] as attached Figure 4 As shown, the ion-selective film is bound to the surface of the sensor through a certain chemical bond; two pins are welded on the two electrodes of the sensor, and the pins are directly connected to the voltage test circuit or electrochemical workstation; put the sensor sensor into the solution to be tested In the method, the chemical substances in the ion-selective membrane can selectively react with the hypochlorite in the solution to be tested, and the potential is directly measured with a millivolt meter, millivolt circuit, or electrochemical workstation.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
CPCG01N27/3335
Inventor 刘荣荣宋智谦薛李荣
Owner ZHANGJIAGANG ONECHIP BIO TECH CO LTD
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