Portable water quality detector and detection method

Abstract

The invention provides a portable water quality detector and a detection method.The detector comprises a detection body and a multi-parameter detection module, the multi-parameter detection module is arranged in a detection cavity and used for detecting multiple parameters of water quality, and the multi-parameter detection module comprises a pH value detection unit, a dissolved oxygen detection unit, a turbidity detection unit and a heavy metal ion detection unit; the system further comprises a sampling unit, a data processing unit and a display unit. The water quality detector integrates various detection units, can rapidly detect various parameters such as pH value, dissolved oxygen, turbidity and heavy metal ions of water quality at the same time, greatly improves the detection efficiency and comprehensiveness, saves time and cost, is especially suitable for scenes requiring rapid acquisition of various water quality indexes, and has wide application prospects. Such as environment monitoring emergency response, water quality control in an industrial production process and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality detection equipment and relates to a portable water quality detector and a detection method. Background Art

[0002] Water quality testing is crucial for safeguarding the ecological environment, human health, and the normal operation of industrial production. Traditional water quality testing methods and instruments have numerous drawbacks. For example, some testing equipment is bulky and difficult to carry, making rapid on-site testing difficult. Some instruments only test a single parameter and cannot simultaneously capture multiple water quality indicators. Other testing processes are cumbersome, requiring specialized personnel, and the accuracy of test results is easily affected by human factors. Furthermore, existing water quality testing equipment also suffers from deficiencies in data transmission, storage, and intelligent analysis, failing to meet modern demands for real-time monitoring and big data analysis.

[0003] Therefore, it is of great practical significance to develop a new, efficient, accurate and comprehensive water quality detector. Summary of the Invention

[0004] The present invention aims to address the shortcomings of the prior art by providing a water quality detector and testing method to address the problems of prior art water quality testing equipment, such as large size, single testing parameters, complex operation, poor accuracy, and low intelligence. The present invention enables rapid and accurate testing of multiple water quality parameters, and provides convenient data transmission, storage, and intelligent analysis capabilities, meeting the needs of water quality testing in various scenarios.

[0005] A first aspect of the present invention provides a portable water quality detector, comprising:

[0006] A detection body, wherein a detection cavity is provided inside the detection body;

[0007] A multi-parameter detection module is provided in the detection chamber and is used to detect multiple parameters of water quality. The multi-parameter detection module includes a pH detection unit, a dissolved oxygen detection unit, a turbidity detection unit, and a heavy metal ion detection unit;

[0008] a sampling unit, connected to the detection chamber, for collecting water samples to be tested and transporting them into the detection chamber;

[0009] a data processing unit, electrically connected to the multi-parameter detection module, and configured to receive and process data detected by the multi-parameter detection module;

[0010] The display unit is electrically connected to the data processing unit and is used to display the detection results processed by the data processing unit.

[0011] Preferably, the heavy metal ion detection unit adopts a spectral-electrochemical combined detection device, including an electrochemical sensor, a micro-spectrometer and a data fusion analysis module. The electrochemical sensor is used to apply a pulse voltage to the water sample to generate a characteristic current signal, the micro-spectrometer is used to obtain the characteristic absorption spectrum of the water sample, and the data fusion analysis module is used to fuse the current signal with the spectral data to determine the type and concentration of heavy metal ions.

[0012] Preferably, the sampling unit includes a sampling pump, a sampling pipe and a filter. The sampling pump is connected to the detection cavity through the sampling pipe. The filter is arranged in the sampling pipe to filter impurities in the water sample.

[0013] Preferably, the pH value detection unit includes a pH electrode, the detection end of the pH electrode extends into the detection cavity, and is used to detect the pH value of the water sample; the dissolved oxygen detection unit adopts a fluorescence dissolved oxygen sensor, and the fluorescence dissolved oxygen sensor is arranged in the detection cavity, and is used to detect the dissolved oxygen content in the water sample; the turbidity detection unit includes a light source and a light detector, and the light source and the light detector are arranged on both sides of the detection cavity relative to each other, and are used to determine the turbidity of the water sample by detecting the degree of light scattering.

[0014] Preferably, it further includes a wireless communication module, which is electrically connected to the data processing unit and is used to transmit the detection results to an external device.

[0015] Preferably, it further comprises a storage unit, which is electrically connected to the data processing unit and is used to store the detection data and the results processed by the data processing unit.

[0016] Preferably, the turbidity detection unit is electrically connected to the data processing unit, and the turbidity detection unit includes:

[0017] an infrared light emitting diode, disposed on one side of the detection cavity and configured to emit infrared light toward the water sample in the detection cavity;

[0018] The photodiode is arranged on the other side of the detection cavity, at a specific angle and a predetermined distance from the infrared light emitting diode, and is used to receive the infrared light scattered by the suspended particles in the water sample and convert it into an electrical signal.

[0019] Preferably, an operation button is provided on the detection body, and the operation button is electrically connected to the data processing unit and is used to control the start, stop and parameter setting operations of the water quality detector.

[0020] A second aspect of the present invention provides a water quality detection method based on any of the portable water quality detectors described above, wherein S1 is a step of cleaning the sampling pipe and the filter to ensure that the collected water sample is not contaminated by impurities;

[0021] S2 collects the water sample to be tested through the sampling unit and transports it into the detection chamber;

[0022] The S3 multi-parameter detection module performs multiple parameter tests on the water sample in the detection chamber, including pH value, dissolved oxygen, turbidity, and heavy metal ion concentration. During the detection process, the detection data is calibrated in real time. The calibration method is to regularly calibrate each detection unit with a standard water sample and correct the detection data based on the difference between the test results of the standard water sample and the known standard value.

[0023] The S4 data processing unit receives the data detected by the multi-parameter detection module and processes and analyzes it;

[0024] S5 display unit displays the test results processed by the data processing unit;

[0025] Among them, the multi-parameter detection module in S3 uses spectroscopy-electrochemistry combined detection technology to detect heavy metal ions in water samples, including:

[0026] Electrochemical pretreatment: Add an appropriate amount of 0.1 mol / L acetate buffer solution into the detection chamber, and concentrate the working electrode at a potential of -1.2 V for 300 seconds to reduce and deposit the target heavy metal ions on the electrode surface.

[0027] Electrochemical detection: Apply a square wave pulse voltage from -1.2V to 0.4V to cause the heavy metals to oxidize and dissolve on the electrode surface, generating a characteristic current peak.

[0028] Spectral detection: During the electrochemical stripping process, a micro-spectrometer is started synchronously to collect the absorption spectrum in the range of 200-800nm;

[0029] Data fusion analysis:

[0030] Time domain alignment: Match the time axis of the electrochemical signal with the spectrum acquisition time to ensure that the data at the same moment correspond;

[0031] Feature extraction: Perform wavelet denoising and baseline correction on electrochemical signals to extract peak potential and peak current; perform Savitzky-Golay filtering and multivariate scattering correction on spectral data to extract absorption peak wavelength and absorbance;

[0032] Multidimensional data modeling: A partial least squares regression algorithm was used to establish a three-dimensional current-spectrum-concentration model. The model inputs were the electrochemical peak current vector and the spectral absorbance matrix, and the output was the concentration values ​​of each heavy metal ion.

[0033] Preferably, when the data processing unit analyzes the detection data and finds that a certain parameter has abnormal fluctuations, a water quality risk warning report is automatically generated, and the warning information is synchronously issued through the display unit and the wireless communication module.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The water quality detector of the present invention integrates multiple detection units and can simultaneously quickly detect multiple parameters such as pH value, dissolved oxygen, turbidity and heavy metal ions of water quality, thereby improving detection efficiency and comprehensiveness, saving time and costs, and is particularly suitable for scenarios where multiple water quality indicators need to be quickly obtained, such as environmental monitoring emergency response, water quality control in industrial production processes, etc.

[0036] This method utilizes advanced sensor technology and data processing algorithms, along with fluorescence-based dissolved oxygen sensors or combined spectroscopic and electrochemical detection techniques, to significantly improve the accuracy and reliability of test results. Compared to traditional detection methods, it can more accurately detect water quality parameters and effectively identify even trace substances, providing a more scientific basis for water quality assessment and decision-making, while avoiding misjudgments caused by detection errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be understood as limiting this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationships described in the drawings are only for illustrative purposes and cannot be understood as limiting this patent.

[0039] As a first embodiment of the present invention, this embodiment provides a portable water quality detector, comprising:

[0040] A detection body, wherein a detection cavity is provided inside the detection body;

[0041] a multi-parameter detection module, disposed in the detection chamber, for detecting multiple parameters of water quality, comprising a pH detection unit, a dissolved oxygen detection unit, a turbidity detection unit, and a heavy metal ion detection unit; a fluorescence dissolved oxygen sensor comprising a fluorescence probe and a sensor circuit, wherein the fluorescence probe is exposed in the detection chamber, and the sensor circuit is configured to process the fluorescence signal and convert it into an electrical signal;

[0042] a sampling unit, connected to the detection chamber, for collecting water samples to be tested and transporting them into the detection chamber;

[0043] a data processing unit, electrically connected to the multi-parameter detection module, and configured to receive and process data detected by the multi-parameter detection module;

[0044] The display unit is electrically connected to the data processing unit and is used to display the detection results processed by the data processing unit.

[0045] In terms of industrial design, the detection body can be designed in the shape of a rectangular parallelepiped, and the outer shell is made of waterproof and dustproof material; a display unit and operation buttons are set on the front, and the display unit uses a touch screen to display the test results and operation menu; the operation buttons are distributed below the display unit, including start, stop, setting and other function buttons.

[0046] In the above embodiment, the heavy metal ion detection unit adopts a spectral-electrochemical combined detection device, including an electrochemical sensor, a micro-spectrometer and a data fusion analysis module. The electrochemical sensor is used to apply a pulse voltage to the water sample to generate a characteristic current signal, the micro-spectrometer is used to obtain the characteristic absorption spectrum of the water sample, and the data fusion analysis module is used to fuse the current signal with the spectral data to determine the type and concentration of heavy metal ions.

[0047] In traditional detection methods, electrochemical signals are generally used to detect heavy metal ions. However, in actual applications, it is found that a single detection technology has certain errors, which cannot be overcome by updating the detection hardware and software. Instead, it is inherent in the detection technology itself. Therefore, in the present invention, electrochemical signals are used to provide highly sensitive concentration information, and spectral signals provide specific structural information. The combination of the two can effectively eliminate the influence of interfering ions. For example, when Cu ions are present in water samples at the same time, the concentration of Cu ions is higher than that of Cu ions. 2+ and Hg 2+ When the electrochemical signals are indistinguishable due to peak overlap, the absorption spectra of the two are significantly different and can be accurately distinguished by data fusion. 2 +、Cd 2 The detection limit of + can reach 0.1μg / L, which is better than the detection limit of 1μg / L of the single electrochemical method and the detection limit of 5μg / L of the single spectral method.

[0048] In some embodiments, the sampling unit includes a sampling pump, a sampling pipe and a filter. The sampling pump is connected to the detection cavity through the sampling pipe. The filter is arranged in the pipe to filter impurities in the water sample.

[0049] As a first preferred embodiment of the present invention, the pH value detection unit includes a pH electrode, the detection end of the pH electrode extends into the detection cavity, and is used to detect the pH value of the water sample; the dissolved oxygen detection unit adopts a fluorescence dissolved oxygen sensor, and the fluorescence dissolved oxygen sensor is arranged in the detection cavity, and is used to detect the dissolved oxygen content in the water sample; the turbidity detection unit includes a light source and a light detector, and the light source and the light detector are arranged on both sides of the detection cavity relative to each other, and are used to determine the turbidity of the water sample by detecting the degree of light scattering.

[0050] Specifically, the turbidity detection unit is electrically connected to the data processing unit, and the turbidity detection unit includes:

[0051] An infrared light emitting diode is provided on one side of the detection chamber and is used to emit infrared light toward the water sample in the detection chamber; the wavelength of the infrared light emitted by the infrared light emitting diode is set between 850 and 950 nanometers. Light in this wavelength range has a good scattering effect on suspended particles in water and is less affected by the color and transparency of the water sample;

[0052] The photodiode is arranged on the other side of the detection cavity, at a specific angle and a predetermined distance from the infrared light emitting diode, and is used to receive the infrared light scattered by the suspended particles in the water sample and convert it into an electrical signal.

[0053] The distance between the infrared light emitting diode and the photodiode is set between 2-5 cm, and the angle between the two is set between 90°-135° to ensure that the photodiode can effectively receive the infrared light scattered by the suspended particles.

[0054] In a preferred embodiment, in order to further improve the accuracy of turbidity detection, in this embodiment, the turbidity detection unit further includes:

[0055] An aperture is provided at the light outlet of the infrared light emitting diode, and is used to limit the divergence angle of the infrared light to ensure that the light enters the water sample in a specific direction;

[0056] The filter is arranged at the light receiving port of the photodiode and is used to filter out light of non-target wavelengths to improve the detection sensitivity of the photodiode to scattered light.

[0057] In some embodiments, it also includes a wireless communication module, which is electrically connected to the data processing unit and is used to transmit the detection results to an external device; it also includes a storage unit, which is electrically connected to the data processing unit and is used to store the detection data and the results processed by the data processing unit. The storage format adopts a database format to facilitate subsequent data query and analysis.

[0058] In some preferred embodiments, in order to facilitate the detection operation, in terms of control and operation, an operation button is set on the detection body, and the operation button is electrically connected to the data processing unit to control the start, stop and parameter setting operations of the water quality detector, thereby simplifying the operation process.

[0059] As another preferred embodiment of the present invention, this embodiment provides a water quality detection method based on the water quality detector described in any of the above embodiments, such as Figure 1 As shown, the following steps are included:

[0060] S1 is a step for cleaning the sampling pipe and filter to ensure that the collected water sample is not contaminated by impurities;

[0061] S2 collects the water sample to be tested through the sampling unit and transports it into the detection chamber;

[0062] The S3 multi-parameter detection module performs multiple parameter tests on the water sample in the detection chamber, including pH value, dissolved oxygen, turbidity, and heavy metal ion concentration. During the detection process, the detection data is calibrated in real time. The calibration method is to regularly calibrate each detection unit with a standard water sample and correct the detection data based on the difference between the test results of the standard water sample and the known standard value.

[0063] The S4 data processing unit receives the data detected by the multi-parameter detection module and processes and analyzes it;

[0064] S5 display unit displays the test results processed by the data processing unit;

[0065] Among them, the multi-parameter detection module in S3 uses spectroscopy-electrochemistry combined detection technology to detect heavy metal ions in water samples, including:

[0066] Electrochemical pretreatment: Add an appropriate amount of 0.1 mol / L acetate buffer solution into the detection chamber, and enrich the working electrode at a potential of -1.2 V for 300 seconds to make the target heavy metal ions, such as Pb 2 +、Cd 2 +、Cu 2+ Equivalent reduction deposition on the electrode surface;

[0067] Electrochemical detection: Apply square wave pulse voltage with a frequency of 25 Hz, an amplitude of 25 mV, and a potential increment of 4 mV, scanning from -1.2 V to 0.4 V, to cause oxidation and dissolution of heavy metals on the electrode surface, generating a characteristic current peak that is proportional to the ion concentration;

[0068] Spectral detection: During the electrochemical dissolution process, a micro-spectrometer is started synchronously to collect the absorption spectrum in the range of 200-800nm. It should be noted that heavy metal ions and their complexes produce absorption peaks at specific wavelengths, such as Pb 2 +At 217nm, Cu 2+ At around 800nm, this technology takes advantage of this characteristic of heavy metal ions;

[0069] Data fusion analysis:

[0070] Time domain alignment: Match the time axis of the electrochemical signal with the spectrum acquisition time to ensure that the data at the same moment correspond;

[0071] Feature extraction: Perform wavelet denoising and baseline correction on electrochemical signals to extract peak potential and peak current; perform Savitzky-Golay filtering and multivariate scattering correction on spectral data to extract absorption peak wavelength and absorbance;

[0072] Multidimensional data modeling: A partial least squares regression algorithm was used to establish a three-dimensional current-spectrum-concentration model. The model inputs were the electrochemical peak current vector and the spectral absorbance matrix, and the output was the concentration values ​​of each heavy metal ion.

[0073] Finally, when the data processing unit analyzes the detection data and finds that a certain parameter has abnormal fluctuations, it automatically generates a water quality risk warning report and sends out warning information simultaneously through the display unit and wireless communication module.

[0074] Compared with a single detection method, this method can improve the detection accuracy by more than 30%, and can detect trace heavy metal ions that are difficult to identify with traditional methods. In the wastewater monitoring of a certain electroplating plant, the traditional electrochemical method showed that Pb 2 + concentration was 5.2 mg / L, but the combined spectroscopic-electrochemical detection found that the absorption peak intensity at 217 nm was abnormally high. Combined with the data fusion model analysis, it was confirmed that the actual Pb 2 + concentration was 8.7 mg / L, and the interfering ion Cr was also detected 3+ The concentration was 3.5 mg / L. The error between this result and the ICP-MS method was less than 5%, demonstrating the accuracy and anti-interference ability of the combined detection technology.

[0075] In terms of appearance and structure, the detection body adopts a waterproof and dustproof design, and the detection cavity has a sealed structure to prevent the external environment from interfering with the detection process.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A portable water quality detector, characterized in that: include: A detection body, wherein a detection cavity is provided inside the detection body; A multi-parameter detection module is provided in the detection chamber and is used to detect multiple parameters of water quality. The multi-parameter detection module includes a pH detection unit, a dissolved oxygen detection unit, a turbidity detection unit, and a heavy metal ion detection unit; a sampling unit, connected to the detection chamber, for collecting water samples to be tested and transporting them into the detection chamber; a data processing unit, electrically connected to the multi-parameter detection module, and configured to receive and process data detected by the multi-parameter detection module; The display unit is electrically connected to the data processing unit and is used to display the detection results processed by the data processing unit.

2. The portable water quality detector according to claim 1, characterized in that: The heavy metal ion detection unit adopts a spectral-electrochemical combined detection device, including an electrochemical sensor, a micro-spectrometer and a data fusion analysis module. The electrochemical sensor is used to apply a pulse voltage to the water sample to generate a characteristic current signal, the micro-spectrometer is used to obtain the characteristic absorption spectrum of the water sample, and the data fusion analysis module is used to fuse the current signal with the spectral data to determine the type and concentration of heavy metal ions.

3. The portable water quality detector according to claim 1, characterized in that: The sampling unit includes a sampling pump, a sampling pipeline and a filter. The sampling pump is connected to the detection cavity through the sampling pipeline. The filter is arranged in the sampling pipeline and is used to filter impurities in the water sample.

4. The portable water quality detector according to claim 1, characterized in that: The pH value detection unit includes a pH electrode, the detection end of which extends into the detection cavity and is used to detect the pH value of the water sample; the dissolved oxygen detection unit adopts a fluorescence dissolved oxygen sensor, which is arranged in the detection cavity and is used to detect the dissolved oxygen content in the water sample; the turbidity detection unit includes a light source and a light detector, which are arranged on both sides of the detection cavity relative to each other and are used to determine the turbidity of the water sample by detecting the degree of light scattering.

5. The portable water quality detector according to claim 1, characterized in that: It also includes a wireless communication module, which is electrically connected to the data processing unit and is used to transmit the detection results to an external device.

6. The portable water quality detector according to claim 1, characterized in that: It also includes a storage unit, which is electrically connected to the data processing unit and is used to store the detection data and the results processed by the data processing unit.

7. The portable water quality detector according to claim 4, characterized in that: The turbidity detection unit is electrically connected to the data processing unit, and the turbidity detection unit includes: an infrared light emitting diode, disposed on one side of the detection cavity and configured to emit infrared light toward the water sample in the detection cavity; The photodiode is arranged on the other side of the detection cavity, at a specific angle and a predetermined distance from the infrared light emitting diode, and is used to receive the infrared light scattered by the suspended particles in the water sample and convert it into an electrical signal.

8. The portable water quality detector according to claim 1, characterized in that: An operation button is provided on the detection body, and the operation button is electrically connected to the data processing unit and is used to control the start, stop and parameter setting operations of the water quality detector.

9. A water quality detection method based on the water quality detector according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1 is a step for cleaning the sampling pipe and filter to ensure that the collected water sample is not contaminated by impurities; S2 collects the water sample to be tested through the sampling unit and transports it into the detection chamber; The S3 multi-parameter detection module performs multiple parameter tests on the water sample in the detection chamber, including pH value, dissolved oxygen, turbidity, and heavy metal ion concentration. During the detection process, the detection data is calibrated in real time. The calibration method is to regularly calibrate each detection unit with a standard water sample and correct the detection data based on the difference between the test results of the standard water sample and the known standard value. The S4 data processing unit receives the data detected by the multi-parameter detection module and processes and analyzes it; S5 display unit displays the test results processed by the data processing unit; Among them, the multi-parameter detection module in S3 uses spectroscopy-electrochemistry combined detection technology to detect heavy metal ions in water samples, including: Electrochemical pretreatment: Add an appropriate amount of 0.1 mol / L acetate buffer solution into the detection chamber, and concentrate the working electrode at a potential of -1.2 V for 300 seconds to reduce and deposit the target heavy metal ions on the electrode surface. Electrochemical detection: Apply a square wave pulse voltage from -1.2V to 0.4V to cause the heavy metals to oxidize and dissolve on the electrode surface, generating a characteristic current peak. Spectral detection: During the electrochemical stripping process, a micro-spectrometer is started synchronously to collect the absorption spectrum in the range of 200-800nm; Data fusion analysis: Time domain alignment: Match the time axis of the electrochemical signal with the spectrum acquisition time to ensure that the data at the same moment correspond; Feature extraction: Perform wavelet denoising and baseline correction on electrochemical signals to extract peak potential and peak current; perform Savitzky-Golay filtering and multivariate scattering correction on spectral data to extract absorption peak wavelength and absorbance; Multidimensional data modeling: A partial least squares regression algorithm was used to establish a three-dimensional current-spectrum-concentration model. The model inputs were the electrochemical peak current vector and the spectral absorbance matrix, and the output was the concentration values ​​of each heavy metal ion.

10. The water quality detection method according to claim 8, characterized in that: When the data processing unit analyzes the detection data and finds that a certain parameter has abnormal fluctuations, it automatically generates a water quality risk warning report and sends out warning information simultaneously through the display unit and wireless communication module.

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