Water pollutant detection device based on fusion of absorption spectrum and electrochemical information

Abstract

A water pollutant detection device based on absorption spectrum and electrochemical information fusion is characterized in that a cuvette is used for containing a to-be-detected sample, the cuvette is located in a sample bin, a light shield covers a base, the sample bin, a photoelectric sensor mounting column and an LED lamp mounting column are all mounted on the base, the LED lamp mounting column is located on the wall surface of one side of the sample bin, and the photoelectric sensor mounting column and the LED lamp mounting column are mounted on the base. A photoelectric sensor mounting column body is arranged on the other side of the sample bin, LED lamp beads with different wavelengths are mounted on the LED lamp mounting column body, a photoelectric sensor is mounted on the photoelectric sensor mounting column body, and a light signal penetrating through the sample to be detected in the cuvette is converted into an electric signal by the photoelectric sensor; the photoelectric sensor is connected with the electric signal detector; an electrochemical measurement assembly is arranged in the sample bin, and an electrode of the electrochemical measurement assembly is located in the to-be-detected sample and connected with an electric signal detector. According to the utility model, the advantages of absorption spectrometry and electrochemical detection are combined, and rapid and accurate detection of various water pollutants is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of water quality detection, and specifically relates to a water pollutant detection device based on the fusion of absorption spectrum and electrochemical information. Background Art

[0002] In recent years, water pollution has become one of the main environmental issues affecting global sustainable development. Water pollution not only harms human health, but also destroys the balance of the ecosystem and hinders sustainable development. In order to protect public health, it is necessary to use scientific means to manage water bodies. Real-time and effective monitoring of pollutants in water bodies is an important means of water management.

[0003] Absorption spectroscopy and electrochemical detection are both commonly used techniques in modern analytical chemistry, each with its own unique advantages and limitations. Absorption spectroscopy is favored for its high sensitivity and non-destructive analysis, and can provide accurate quantitative information and material structure analysis, but its disadvantage is that it may be interfered by the color or turbidity of the sample, and for multi-component samples, spectral overlap may affect the accuracy of the results. The advantages of electrochemical methods are its low cost, simple operation and rapid response, which are particularly suitable for real-time monitoring and multi-component sample analysis, but it is limited by the choice of electrode materials and the surface state of the electrode, and may be interfered by other redox active substances. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a water pollutant detection device based on the fusion of absorption spectroscopy and electrochemical information, which combines the advantages of absorption spectroscopy and electrochemical detection to achieve rapid and accurate detection of various water pollutants.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A water pollutant detection device based on the fusion of absorption spectrum and electrochemical information comprises a base, a light shield, a cuvette, a sample chamber, a photoelectric sensor mounting column and an LED lamp mounting column, wherein the cuvette is used to hold a sample to be tested and is located in the sample chamber, the light shield covers the base, the sample chamber, the photoelectric sensor mounting column and the LED lamp mounting column are all mounted on the base, the LED lamp mounting column is located on a wall surface on one side of the sample chamber, the photoelectric sensor mounting column is arranged on the other side of the sample chamber, LED lamp beads of different wavelengths are mounted on the LED lamp mounting column, a photoelectric sensor is mounted on the photoelectric sensor mounting column, the light emitted by the LED lamp beads irradiates the sample to be tested in the cuvette and is received by the photoelectric sensor, and the photoelectric sensor converts the light signal of the sample to be tested in the cuvette into an electrical signal; the photoelectric sensor is connected to an electrical signal detector; an electrochemical measurement component is arranged in the sample chamber, the electrode of the electrochemical measurement component is located in the sample to be tested, and the electrode is connected to the electrical signal detector.

[0007] Furthermore, the sample chamber comprises a sample slot and a sample chamber cover for closing the sample chamber, the sample chamber cover covers an opening of the sample slot, and a cuvette for carrying a sample to be tested is placed in the sample slot.

[0008] Furthermore, the electrodes include a working electrode, a counter electrode and a reference electrode, and the sample chamber cover is provided with three small holes, and the working electrode, the counter electrode and the reference electrode are located in the small holes.

[0009] The working electrode is the channel for electrons to enter and leave the solution. The transfer of these electrons is directly related to the redox reaction of the substance to be tested. In the electrochemical reaction, the redox reaction on the working electrode will generate current. The presence of the counter electrode allows this current to flow smoothly in the electrochemical cell, thereby maintaining the reaction. The core feature of the reference electrode is that it can provide a constant potential, which is essential for accurate electrochemical measurements. During the test, the three electrodes are fixed in the three holes on the sample compartment cover by rubber rings.

[0010] Preferably, the photoelectric sensor mounting column is fixed in a square mounting hole of a photoelectric mounting seat on the base.

[0011] Two LED lamp installation columns are arranged on the side wall of the sample chamber, the two LED lamp installation columns correspond to two LED lamp path channels, and the LED lamp path channels are both connected to the sample chamber, and two LED lamp beads with different wavelengths can be placed according to different materials.

[0012] In order to maintain the stability of light intensity, the LED lamp needs to be fixed on the mounting column. The fixing structure is designed according to the appearance of different LED light sources. The visible light LED is fixed on the LED lamp mounting column by a fixed bracket. The ultraviolet LED has a large power when irradiated, so a heat dissipation substrate is required and it is fixed on the LED lamp mounting column with a mechanical gripper.

[0013] When the utility model detects, the sample to be detected is placed in the cuvette in the sample chamber, and the sample chamber cover is firstly covered, and then the light shield is covered to ensure that the sample is not affected by external light during the detection.

[0014] The beneficial effects of the utility model are mainly manifested in: combining the absorption optical path structure with the electrochemical detection structure, combining the advantages of absorption spectroscopy and electrochemical detection; by switching LED lamp beads of different wavelengths, simultaneously obtaining the electrical signal fed back by the electrode, completing the rapid scanning of different samples in the sample chamber, and realizing the combination of measured absorption data and electrochemical data; improving the accuracy of the measurement results, being able to detect pollutants such as nitrate, nitrite, fluorescent whitening agent, ciprofloxacin, etc., and realizing rapid and accurate detection of the types and concentrations of various pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a water pollutant detection device based on the fusion of absorption spectrum and electrochemical information;

[0016] Figure 2 It is a front view of a water pollutant detection device based on the fusion of absorption spectrum and electrochemical information;

[0017] Figure 3 A top view of a water pollutant detection device based on the fusion of absorption spectrum and electrochemical information;

[0018] Figure 4 It is a side view of a water pollutant detection device based on the fusion of absorption spectrum and electrochemical information;

[0019] In the figure: 1. base, 2. sample slot, 3. photoelectric mounting seat, 4. cuvette, 5. photoelectric sensor mounting column, 6. first LED lamp mounting column, 7. second LED lamp mounting column, 8. sample compartment cover, 9. light shield. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings.

[0021] Reference Figure 1 to Figure 4, a water pollutant detection device based on the fusion of absorption spectrum and electrochemical information, comprising a base 1, a light shield 9, a cuvette 4, a sample compartment, a photoelectric sensor mounting column 5 and an LED lamp mounting column 7, wherein the cuvette 4 is used to hold a sample to be tested, the cuvette 4 is located in the sample compartment, the light shield 9 covers the base 1, the sample compartment, the photoelectric sensor mounting column 5 and the LED lamp mounting column are all mounted on the base 1, the LED lamp mounting column is located on one side wall of the sample compartment, the photoelectric sensor mounting column 5 is arranged on the other side of the sample compartment, LED lamp beads of different wavelengths are installed on the LED lamp mounting column, a photoelectric sensor is installed on the photoelectric sensor mounting column 5, the light emitted by the LED lamp beads irradiates the sample to be tested in the cuvette 4 and is received by the photoelectric sensor, the photoelectric sensor converts the light signal of the sample to be tested in the cuvette into an electrical signal; the photoelectric sensor is connected to the electrical signal detector; an electrochemical measurement component is arranged in the sample compartment, the electrode of the electrochemical measurement component is located in the sample to be tested, and the electrode is connected to the electrical signal detector.

[0022] The LED lamp beads include ultraviolet light-emitting LEDs capable of emitting a wavelength of 230-240nm and a central emission wavelength of 235nm, and ultraviolet light-emitting LEDs capable of emitting a wavelength of 330-340nm and a central emission wavelength of 235nm; the selected LED lamp beads are fixed in the LED lamp mounting column 7; the photoelectric sensor is fixed on the photoelectric sensor mounting column 5 to receive the transmitted light intensity of the lamp beads through the sample to be tested in the cuvette and convert it into an electrical signal.

[0023] Further, the sample chamber includes a sample slot 2 and a sample chamber cover 8 for closing the sample chamber, the sample chamber cover 8 covers the opening of the sample slot 2, and a cuvette 4 for carrying the sample to be tested is placed in the sample slot 2. The cuvette 4 is a custom-made cuvette with a large light-transmitting surface and an optical path set to 1 cm.

[0024] The working electrode of the electrochemical measurement component is a glassy carbon electrode, the counter electrode is a platinum electrode, and the reference electrode is an AgCl electrode, which are placed in the circular hole set in the sample compartment cover 8.

[0025] The electrical signal detector comprises an absorption electrochemical signal selection circuit, a signal amplification circuit and a microprocessor for analyzing and processing the signal, and the signal amplification circuit is connected to the output end of the photoelectric sensor.

[0026] The microprocessor includes STM32F103ZET6, a 16-bit digital-to-analog converter DAC8831, an operational amplifier selected as OPA277 operational amplifier, a voltage conversion module MP1593 and CP2985AIM5, and a filter circuit selected as a first-order active filter.

[0027] Two LED lamp mounting columns (a first LED lamp mounting column 6 and a second LED lamp mounting column 7) are arranged on the side wall of the sample chamber. The two LED lamp mounting columns correspond to two LED light path channels. Both LED light path channels are connected to the sample chamber. Two LED lamp beads with different wavelengths can be placed according to different materials.

[0028] The number of optical channels is consistent with the number of light sources. The connecting wires between the light sources and the electrodes are led into the interior of the base through the small holes on the base and fixed by a mechanical gripper. In order to maintain the stability of the excitation light intensity, the LED lamp needs to be fixed on the mounting column. The fixing structure is designed according to the appearance of different LED light sources. The visible light LED is fixed by a fixed bracket. The ultraviolet LED has a large power when irradiated, so a heat dissipation substrate is required and fixed by a mechanical gripper.

[0029] The photoelectric sensor is a S1227-BQ photodiode with a sensitivity of 0.36A / W, a maximum dark current of 5pA, and a wavelength response range of 190-1000nm.

[0030] The working process of the water pollutant detection device based on the fusion of absorption spectrum and electrochemical information in this embodiment is as follows:

[0031] Place the cuvette containing the sample to be tested into the sample slot 2, and cover the sample compartment cover 8 and the light shield 9 in turn. The light sources of ultraviolet LEDs with a central wavelength of 235nm and a central wavelength of 335nm emit light beams to the sample compartment in turn. The light shield 9 and the sample compartment cover 8 are used to shield external light during measurement to avoid being affected. A glassy carbon electrode is selected as the working electrode for electrochemical detection, a platinum electrode is selected as the counter electrode, and an AgCl electrode is selected as the reference electrode, which are placed in the circular hole set in the sample compartment cover 8.

[0032] The photoelectric sensor is fixed in the square mounting hole of the photoelectric mounting seat 3 on the base 1, receives the light signal transmitted through the cuvette and converts it into an electrical signal, and also receives the feedback electrical signal on the three electrodes of electrochemical detection. The signal amplification circuit amplifies the tiny electrical signal, and the absorption signal and the electrochemical signal information fusion modeling are performed through the microprocessor in the electrical signal detector to analyze the types and concentrations of pollutants in the water body, and finally realize the measurement of the types and concentrations of pollutants such as nitrate, nitrite, fluorescent whitening agent, ciprofloxacin, etc. in the water body.

[0033] Among them, the central wavelength of 235nm represents the pollutants: nitrate and nitrite, and the central wavelength of 335nm represents the pollutants: ciprofloxacin and fluorescent whitening agents. The electrochemical detection information is fused with the 235nm and 335nm absorbance information to achieve the combination of measured absorption data and electrochemical data, improve the accuracy of the measurement results, and realize the rapid and accurate detection of the types and concentrations of various pollutants.

[0034] By using a water pollutant detection device that integrates absorption spectrum and electrochemical information provided in this embodiment, the requirements of a detection instrument that can detect a variety of pollutants and a fast detection speed can be met, and it has good prospects for application and promotion.

[0035] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope of the present invention.

Claims

1. A water pollutant detection device based on the fusion of absorption spectrum and electrochemical information, characterized in that: The device comprises a base, a light shield, a cuvette, a sample chamber, a photoelectric sensor mounting column and an LED lamp mounting column. The cuvette is used to hold a sample to be tested and is located in the sample chamber. The light shield covers the base. The sample chamber, the photoelectric sensor mounting column and the LED lamp mounting column are all mounted on the base. The LED lamp mounting column is located on a wall surface on one side of the sample chamber. The photoelectric sensor mounting column is arranged on the other side of the sample chamber. LED lamp beads of different wavelengths are installed on the LED lamp mounting column. A photoelectric sensor is installed on the photoelectric sensor mounting column. The light emitted by the LED lamp beads illuminates the sample to be tested in the cuvette and is received by the photoelectric sensor. The photoelectric sensor converts the light signal of the sample to be tested in the cuvette into an electrical signal. The photoelectric sensor is connected to an electrical signal detector. An electrochemical measurement component is arranged in the sample chamber. The electrode of the electrochemical measurement component is located in the sample to be tested and is connected to the electrical signal detector.

2. The water pollutant detection device based on the fusion of absorption spectrum and electrochemical information as claimed in claim 1 is characterized in that: The sample chamber of the device comprises a sample slot and a sample chamber cover for closing the sample chamber, wherein the sample chamber cover covers the opening of the sample slot, and a cuvette for carrying a sample to be tested is placed in the sample slot.

3. The water pollutant detection device based on the fusion of absorption spectrum and electrochemical information as claimed in claim 2 is characterized in that: The electrodes include a working electrode, a counter electrode and a reference electrode. The sample chamber cover is provided with three small holes, and the working electrode, the counter electrode and the reference electrode are located in the small holes.

4. The water pollutant detection device based on the fusion of absorption spectrum and electrochemical information according to any one of claims 1 to 3, characterized in that: The photoelectric sensor mounting column is fixed in a square mounting hole of a photoelectric mounting seat on the base.

5. The water pollutant detection device based on the fusion of absorption spectrum and electrochemical information according to any one of claims 1 to 3, characterized in that: Two LED lamp installation columns are arranged on the side wall of the sample chamber, the two LED lamp installation columns correspond to two LED lamp path channels, and the LED lamp path channels are both connected to the sample chamber, and two LED lamp beads with different wavelengths can be placed according to different materials.

6. The water pollutant detection device based on the fusion of absorption spectrum and electrochemical information as claimed in claim 5 is characterized in that: The fixing structure is designed according to different LED light sources. The visible light LED is fixed on the LED lamp mounting column by a fixing bracket, and the ultraviolet LED is connected to the heat dissipation substrate. The ultraviolet LED is fixed on the LED lamp mounting column by a mechanical gripper.

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