Online analyzer for heavy metals in water

Abstract

According to the online analyzer for the heavy metals in the water, a sample injection module is provided with a plurality of valve ports, a plurality of required containers can be conveniently communicated, each valve port can be independently opened or closed, and any required liquid can be conveniently and selectively pumped. Through the first pumping direction and the second pumping direction of the pumping module, liquid in any container can be conveniently pumped to the absorbance detection module or discharged from a waste liquid valve port after being metered. The whole detection process is simple in operation steps, accurate in metering and timely in pumping, and can solve the problems that when the concentration of the heavy metal compound is measured by an existing laboratory method, manual operation is tedious, the number of detection samples is small, the detection time period is long, the cost is high, and the heavy metal compound is prone to loss, so that the accuracy of a detection result is poor, and reproducibility is poor.

Description

Technical Field

[0001] The present application belongs to the technical field of analyzers, and in particular relates to an online analyzer for heavy metals in water. Background Art

[0002] Currently, commonly used methods for detecting heavy metal compounds include spectrophotometry, mass spectrometry, and spectroscopy. These are common analytical methods in laboratories and are also common methods in the current analytical field. During analysis, the concentration of heavy metal compounds in the sample is quantitatively determined through steps such as acid digestion, air blowing, reaction, color development, and detection. Because heavy metal compounds are extremely unstable and easily hydrolyzed, excessive steps during water sample analysis often lead to loss of heavy metal compounds, ultimately resulting in poor reliability and precision of test results. This is a common problem with current heavy metal compound analysis methods. Furthermore, fluorescence spectroscopy, graphite furnace atomic absorption spectrophotometry, and inductively coupled plasma mass spectrometry are cumbersome to operate, require expensive equipment, have high maintenance costs, and require high technical skills. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an online heavy metal analyzer in water in order to solve the above-mentioned difficulties in the method for detecting heavy metal compounds in the prior art.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] An online heavy metal analyzer in water, comprising:

[0006] An injection module, comprising a water sample valve port, a waste liquid valve port, and a reagent valve port, wherein the water sample valve port is configured to communicate with a water sample container storing a water sample, the waste liquid valve port is used to discharge waste liquid, and the reagent valve port is configured to communicate with a reagent container storing a reagent; the water sample valve port, the waste liquid valve port, and the reagent valve port can all be opened or closed independently;

[0007] A metering module, comprising a metering tube for measuring the amount of liquid, the metering tube being connected to the sampling module;

[0008] An absorbance detection module, which is used to detect the components of the water sample and is connected to the sampling module;

[0009] A pumping module, the pumping module is connected to the metering tube, and the pumping module has a first pumping direction and a second pumping direction; when the pumping module operates in the first pumping direction, it can pump the water sample in the water sample container connected to the absorbance detection module and the injection module or the reagent in the reagent container into the metering tube; when the pumping module operates in the second pumping direction, it can pump air, the water sample or the reagent in the metering tube into the absorbance detection module or into the injection module and discharge it through the waste valve port.

[0010] Preferably, in the online heavy metal analyzer in water of the present invention, the absorbance detection module includes a reaction pool, a first solenoid valve and a second solenoid valve, the second solenoid valve is set on the first pipe connecting the reaction pool to the injection module to control on and off, and the first solenoid valve is set on the second pipe connecting the reaction pool to the atmosphere to control on and off.

[0011] Preferably, in the online heavy metal analyzer in water of the present invention, the sampling module further comprises a blank water valve port, the blank water valve port is configured to be connected to a container storing blank water, and the blank water valve port can be opened or closed independently.

[0012] Preferably, in the online heavy metal analyzer in water of the present invention, the sampling module further comprises a standard liquid valve port, the standard liquid valve port is configured to be connected to a container for storing the standard liquid, and the standard liquid valve port can be opened or closed independently.

[0013] Preferably, in the online heavy metal analyzer in water of the present invention, the pumping module includes a peristaltic pump, the rotor of the peristaltic pump can rotate forward or reverse, when the rotor rotates forward, the peristaltic pump pumps liquid in a first pumping direction, and when the rotor reverses, the peristaltic pump pumps liquid in a second pumping direction.

[0014] Preferably, the online heavy metal analyzer in water of the present invention further includes a heating detection module and / or a cooling detection module, the heating detection module is used to heat the water sample in the absorbance detection module, and the cooling detection module is used to cool the water sample in the absorbance detection module.

[0015] Preferably, in the online heavy metal analyzer in water of the present invention, the heating detection module comprises a heating wire, which is wound around the absorbance detection module to transfer heat to the liquid inside the module;

[0016] The cooling detection module includes a micro fan, and the rotation of the micro fan can reduce the temperature of the liquid inside the absorbance detection module;

[0017] The online heavy metal analyzer in water further comprises a temperature sensor, which is used to monitor the temperature parameters of the liquid inside the absorbance detection module in real time.

[0018] Preferably, in the online heavy metal analyzer in water of the present invention, the metering module further comprises a signal detection circuit, and the signal detection circuit is connected to the metering tube to obtain the volume value of the liquid in the metering tube through photoelectric detection.

[0019] Preferably, the online heavy metal analyzer in water of the present invention further includes a remote control platform module, and the remote control platform module includes a communication module for reading and controlling real-time data between the sampling module, the metering module, the absorbance detection module and the pumping module.

[0020] Preferably, in the online heavy metal analyzer in water of the present invention, the absorbance detection module includes a light-emitting diode, a photodiode and a signal detection circuit board. The light-emitting diode emits light of a specific wavelength which passes through the liquid to be tested and is absorbed by the photodiode. The light signal obtained by the photodiode is converted into an electrical signal by the signal detection circuit board for processing.

[0021] The beneficial effects of the present invention are as follows: the injection module is provided with a plurality of valve ports, which can facilitate the connection of a plurality of required containers, and each valve port can be opened or closed independently, so as to facilitate the selective pumping of any required liquid. By setting the first pumping direction and the second pumping direction of the pumping module, the liquid in any container can be conveniently measured and pumped to the absorbance detection module or discharged from the waste liquid valve port. The entire detection process has simple operation steps, accurate measurement, and timely pumping, which can solve the problems of the existing laboratory method for determining the concentration of heavy metal compounds, such as cumbersome manual operation, small number of test samples, long detection period, high cost, easy loss of heavy metal compounds, and poor accuracy and reproducibility of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The technical solution of the present application is further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 It is a structural schematic diagram of the online heavy metal analyzer in water according to an embodiment of the present application.

[0024] The reference numerals in the figures are:

[0025] Injection module 1; metering module 2; absorbance detection module 3, pumping module 4; first solenoid valve 31; second solenoid valve 32. DETAILED DESCRIPTION

[0026] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0029] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Example

[0030] This embodiment provides an online heavy metal analyzer in water. Figure 1 Shown, including:

[0031] The sampling module 1 includes a water sample valve port, a waste liquid valve port, and a reagent valve port. The water sample valve port is configured to communicate with a water sample container storing water samples, the waste liquid valve port is used to discharge waste liquid, and the reagent valve port is configured to communicate with a reagent container storing reagents; the water sample valve port, the waste liquid valve port, and the reagent valve port can all be opened or closed separately;

[0032] A metering module 2, comprising a metering tube for measuring the amount of liquid, the metering tube being connected to the sampling module 1;

[0033] An absorbance detection module 3, which is used to detect the components of the water sample and is connected to the sample injection module 1;

[0034] The pumping module 4 is connected to the metering tube, and the pumping module 4 has a first pumping direction and a second pumping direction; when the pumping module 4 operates in the first pumping direction, it can pump the water sample in the water sample container connected to the absorbance detection module 3 and the injection module 1 or the reagent in the reagent container into the metering tube; when the pumping module 4 operates in the second pumping direction, it can pump air, the water sample or the reagent in the metering tube into the absorbance detection module 3 or into the injection module 1 and discharge it through the waste valve port.

[0035] In the online analyzer for heavy metals in water of this embodiment, the sampling module 1 is provided with multiple valve ports, which can facilitate the connection of multiple required containers. Each valve port can be opened or closed independently, which facilitates the selective pumping of any required liquid. Through the first pumping direction and the second pumping direction set by the pumping module 4, the liquid in any container can be conveniently measured and pumped to the absorbance detection module 3 or discharged from the waste liquid valve port. The entire detection process has simple operating steps, accurate measurement, and timely pumping. It can solve the problems of cumbersome manual operation, small number of test samples, long detection time period, high cost, and easy loss of heavy metal compounds when determining the concentration of heavy metal compounds in existing laboratory methods, resulting in poor accuracy and reproducibility of test results.

[0036] The following provides an operating method of the online heavy metal analyzer in water according to this embodiment:

[0037] (1) In the preparation stage, the analyzer is powered on, and the valve ports of the injection module 1 are connected to the required containers such as the water sample storage container, the reagent storage container, and the waste liquid barrel through the corresponding pipes.

[0038] (2) The water sample testing process includes:

[0039] S1, empty the residual liquid in the absorbance detection module 3. Control the pumping module 4 to operate in the first pumping direction. When the high liquid level in the metering module 2 detects the presence of liquid, open the waste valve port of the injection module 1, and control the pumping module 4 to operate in the second pumping direction to discharge the liquid in the metering tube through the waste valve port of the injection module 1. Repeat this process several times until the liquid in the absorbance detection module 3 is completely drained.

[0040] S2, water sample introduction. The water sample valve port of the sampling module 1 is opened, and the pumping module 4 is controlled to operate in the first pumping direction, pumping the water sample from the water sample storage container into the metering tube of the metering module 2 (the volume can be set according to the software program). When the liquid detector in the metering tube detects liquid, the pumping module 4 is controlled to operate in the second pumping direction, the water sample valve port of the sampling module 1 is closed, and the water sample is pressurized by the pumping module 4 and flows into the absorbance detection module 3;

[0041] S3, introduce reagent A. The reagent A valve port of the sample injection module 1 is opened, and the pumping module 4 is controlled to operate in the first pumping direction to draw the reagent in the reagent tube A into the metering tube of the metering module 2 (the volume can be set according to the software program for metering). When the liquid detector in the metering tube detects liquid, the pumping module 4 is controlled to operate in the second pumping direction, the reagent A valve port of the sample injection module 1 is closed, and the reagent A liquid flows into the absorbance detection module 3 under the pressure of the pumping module 4. The pumping module 4 continues to operate in the second pumping direction, blowing air into the reaction cell to fully mix the solution;

[0042] S4, introduce reagent B. The reagent B valve port of the sample injection module 1 is opened, and the pumping module 4 is controlled to operate in the first pumping direction to draw the reagent in the reagent tube B into the metering tube of the metering module 2 (the volume can be set according to the software program for metering). When the liquid detector in the metering tube detects liquid, the pumping module 4 is controlled to operate in the second pumping direction, and the reagent B valve port of the sample injection module 1 is closed. The reagent B liquid is pressured by the pumping module 4 and flows into the absorbance detection module 3. The pumping module 4 continues to operate in the second pumping direction, blowing air into the reaction cell to fully mix the solution.

[0043] S5, introduce reagent C. The reagent C valve port of the sample injection module 1 is opened, and the pumping module 4 is controlled to operate in the first pumping direction to draw the reagent in the reagent tube C into the metering tube of the metering module 2 (the volume can be set according to the software program for metering). When the liquid detector in the metering tube detects liquid, the pumping module 4 is controlled to operate in the second pumping direction, and the reagent C valve port of the sample injection module 1 is closed. The reagent C liquid is pressured by the pumping module 4 and flows into the absorbance detection module 3. The pumping module 4 continues to operate in the second pumping direction, blowing air into the reaction cell to fully mix the solution.

[0044] S6, reagent D is introduced. The reagent D valve port of the sample injection module 1 is opened, and the pumping module 4 is controlled to operate in the first pumping direction to extract the reagent in the reagent tube D into the metering tube of the metering module 2 (the volume can be set according to the software program for metering). When the liquid detector in the metering tube detects liquid, the pumping module 4 is controlled to operate in the second pumping direction, and the reagent D valve port of the sample injection module 1 is closed. The reagent D liquid is pressured by the pumping module 4 and flows into the absorbance detection module 3. The pumping module 4 continues to operate in the second pumping direction, blowing air into the reaction cell to fully mix the solution.

[0045] S7, the mixed solution is left to stand for a period of time (3 min to 30 min), and the online analyzer does not take any action;

[0046] S8, absorbance detection: The light-emitting diode in the absorbance detection module 3 turns on at a specific time and illuminates the solution inside the reaction cell. The photodiode converts the light signal of the specific wavelength into an electrical signal, and finally obtains the absorbance A=log(V1 / V2). Then, according to the linear relationship between the concentration of the standard solution and the absorbance C=KA+B, the concentration value of the standard solution or water sample is calculated.

[0047] S9: Empty the remaining liquid in the absorbance detection module 3. The pumping module 4 is controlled to operate in the first pumping direction. When the high liquid level in the metering module 2 detects the presence of liquid, the waste valve port of the injection module 1 is opened, and the pumping module 4 is controlled to operate in the second pumping direction to discharge the liquid in the metering tube through the waste valve port of the injection module 1. This process is repeated several times until the liquid in the absorbance detection module 3 is completely drained.

[0048] S10, the test process is completed and enters the online waiting state.

[0049] It can be understood that in the above steps, S3 to S6 provide steps for adding four different reagents in sequence. In actual situations, it is necessary to add several reagents as needed according to the specific items being tested, for example, only one reagent can be added, or 2 to 4 reagents can be added, or more than 5 reagents can be added.

[0050] The above workflow can be briefly described as follows: a certain amount of water sample or standard sample is first introduced, followed by independent injection of reagents (reagent A, reagent B, reagent C, and reagent D) through injection module 1. All water samples and reagents are quantitatively extracted by pumping module 4 and detected by metering module 2 to accurately measure the target volume. After the water sample and reagents enter the reaction cell, they are repeatedly blown through pumping module 4, and the solution undergoes color development. After the color development reaction lasts for 5 to 30 minutes, the light-emitting diode emits light of a specific wavelength. The light that passes through the solution is absorbed by the photodiode, and the optical signal is converted into an electrical signal. The signal is then amplified and filtered within the circuit, and finally converted into absorbance. Based on this, the online heavy metal water analyzer detection method provided by the utility model improves the accuracy and reproducibility of water sample analysis, and can achieve the efficient operation goals of truly automated, large-scale, and low-cost water quality monitoring.

[0051] In an optional embodiment, if Figure 1 As shown, the absorbance detection module 3 includes a reaction cell, a first solenoid valve 31, and a second solenoid valve 32. The second solenoid valve 32 is provided on the first pipe connecting the reaction cell to the injection module 1 to control on / off, and the first solenoid valve 31 is provided on the second pipe connecting the reaction cell to the atmosphere to control on / off. In this embodiment, by providing the first solenoid valve 31 and the second solenoid valve 32 at the inlet and outlet of the reaction cell, respectively, the first or second pipe can be conveniently opened or closed as needed at any time, so that the liquid in the reaction cell can be pumped to a designated location as needed.

[0052] In an optional embodiment, if Figure 1 As shown, the injection module 1 also includes a blank water valve port, which is configured to connect to a container for storing blank water and can be opened or closed independently. In this embodiment, blank water is used for cleaning. The provision of the blank water valve port can facilitate cleaning of the reaction pool. For example, after the above-mentioned step S9, a reaction pool cleaning step can be performed: the blank water valve port of the injection module 1 is opened, and the pumping module 4 is controlled to operate in a first pumping direction. When the high liquid level in the metering module 2 detects the presence of liquid, the blank water valve port of the injection module 1 is closed, the first solenoid valve 31 and the second solenoid valve 32 are opened, and the pumping module 4 is controlled to operate in a second pumping direction to pressurize the blank water in the metering tube into the reaction pool. This is repeated several times until the liquid in the reaction pool reaches the volume set by the software program.

[0053] In an optional embodiment, if Figure 1 As shown, the sampling module 1 also includes a standard liquid valve port, which is configured to communicate with a container for storing standard liquid and can be opened or closed independently. In this embodiment, the standard liquid is used to calibrate the water sample before testing. The configuration of the standard liquid valve port allows for more convenient access to the standard liquid, speeding up the testing process.

[0054] In an optional embodiment, if Figure 1 As shown, the pumping module 4 includes a peristaltic pump whose rotor can rotate forward or reverse. When the rotor rotates forward, the peristaltic pump pumps liquid in a first pumping direction. When the rotor rotates reversely, the peristaltic pump pumps liquid in a second pumping direction. In this embodiment, by selecting a peristaltic pump with a rotor that can rotate forward or reverse, two available pumping directions are achieved, resulting in simple equipment and strong controllability.

[0055] In an optional embodiment, the online heavy metal analyzer in water further includes a heating detection module and / or a cooling detection module, wherein the heating detection module is used to heat the water sample in the absorbance detection module 3, and the cooling detection module is used to cool the water sample in the absorbance detection module 3. In this embodiment, the provision of the heating detection module and / or the cooling detection module enables the temperature of the tested water sample to easily reach the target temperature, thereby unifying the experimental environment.

[0056] In an optional embodiment, the heating detection module includes a heating wire, which is wound around the reaction pool to transfer heat to the liquid inside it; the cooling detection module includes a micro fan, which can reduce the temperature of the liquid inside the reaction pool by rotating the micro fan; the online heavy metal analyzer in water also includes a temperature sensor, which is used to monitor the liquid temperature parameters inside the absorbance detection module 3 in real time.

[0057] In this embodiment, the reaction cell can be made of glass, the temperature sensor can be a thermocouple, and the heating detection module and the cooling detection module can share a temperature sensor or have independent temperature sensors. The temperature sensor monitors the temperature parameters in real time and accurately controls the target temperature.

[0058] In an optional embodiment, the metering module 2 further includes a signal detection circuit, which is connected to the metering tube to obtain the volume value of the liquid in the metering tube through photoelectric detection. Figure 1 As shown, the signal detection circuit sets three detection points: low liquid level, middle liquid level and high liquid level. When the liquid level reaches a certain level, it will be detected by the signal detection circuit accordingly. Figure 1 The detection points in the figure are used as examples. The specific number of detection points can be set as needed.

[0059] In an optional embodiment, the online heavy metal analyzer in water further includes a remote control platform module, which includes a communication module for reading and controlling real-time data between the sampling module 1, the metering module 2, the absorbance detection module 3, and the pumping module 4. In this embodiment, the configuration of the remote control platform module enables remote online analysis of the analyzer of this embodiment, requiring the equipment to be brought to the site.

[0060] In an optional embodiment, the remote control module includes a circuit board and an operating screen with a control system; it also includes an RS485 communication module and control software with its own communication protocol. The control board is primarily used to control the peristaltic pump, solenoid valve, fan, and other components. The operating screen facilitates user interaction with the system, such as designing a maintenance interface, clicking operation areas, and parameter settings to implement the aforementioned water sample testing process.

[0061] In an optional embodiment, the absorbance detection module 3 includes a light-emitting diode (LED), a photodiode, and a signal detection circuit board. The LED emits light of a specific wavelength, which passes through the liquid to be tested and is then absorbed by the photodiode. The light signal acquired by the photodiode is converted into an electrical signal for processing by the signal detection circuit board. In the absorbance detection module, an LED emits light that illuminates the solution. The transmitted light is absorbed by a silicon photocell and converted into an electrical signal. This signal is then amplified and filtered within the circuit before being converted into absorbance data.

[0062] In an optional embodiment, the metering tube is made of high-quality glass, which is smooth and free of water droplets; the injection module 1 adopts a multi-valve group, such as a ten-valve group.

[0063] The online heavy metal analyzer in water provided by the present embodiment can be applied to tin detection, and the salicyl fluorone-ionic surfactant CTMAB system spectrophotometry is selected. In combination with automatic control technology, small volume metering technology, photoelectric detection technology, data transmission technology, Internet of Things technology, and communication technology, online analysis of heavy metal tin in water is realized. The online analyzer provided by the present utility model can be set up at a fixed sampling point to monitor the position of the online monitoring point. The water sample is extracted in real time by an external sampling pump on site for real-time online monitoring of heavy metal tin. The automatic detection cycle of the sample does not exceed 1 hour, and the measurement cycle can be manually set according to the actual detection needs. The highly automated instrument replaces the manual detection in the laboratory, solves a series of problems such as manual on-site sampling, manual storage of samples, refrigerated transportation of samples, and laboratory distribution detection, and fully guarantees the representativeness of on-site water sample monitoring.

[0064] In tin detection, the online heavy metal analyzer in water provided by this embodiment has the following beneficial effects:

[0065] (1) The standard laboratory analysis method of the environmental industry, "Spectrophotometry of Salicyl Fluorone-Ionic Surfactant CTMAB System", is transformed into an online automatic monitoring method for water quality that can be applied to heavy metal online analyzers. It has complete automatic sampling, measurement, calibration, standard solution verification, cleaning and other functions, meeting the dynamic management and control requirements of various places, multi-level optical metering system, low reagent consumption, small amount of waste liquid, low operating cost, remote reverse control and other functions.

[0066] (2) The spectrophotometric method of salicylfluorone-ionic surfactant CTMAB system is fully followed. Combined with the independently developed high-precision metering module, the metering liquid has high stability, stability ≤1.0%, and the linearity of the test standard solution of different concentrations is good, and the repeatability is better than other manufacturers in the industry.

[0067] (3) The online analyzer uses a micro-metering tube, so that the water sample consumed during sampling is only 1% to 2% of the manual sampling amount of direct spectrophotometry. The consumption of chemical reagents is also reduced year-on-year. Therefore, the generation of analytical waste liquid is greatly reduced during the entire sample measurement process, reducing environmental pollution.

[0068] The online heavy metal analyzer in water provided by this embodiment can be applied to antimony detection, and adopts 2-[(5-bromo-2-pyridine)-azo]-emulsifier OP system spectrophotometry to solve the problems of cumbersome manual operation, small number of test samples, long detection time cycle, high cost, easy loss of antimony compounds, resulting in poor accuracy and reproducibility of test results when the existing laboratory method for determining the concentration of antimony compounds is used. At the same time, the heavy metal online analyzer provided by the utility model has real-time data transmission and remote control functions, which facilitates remote monitoring and operation and maintenance, and reduces the frequency of on-site operation and maintenance; in addition, due to the high-precision metering module, its measurement accuracy and reproducibility and other characteristics make it unnecessary to reduce the measurement error by increasing the amount of water sample used. The water sample consumed by the heavy metal online analyzer provided by the utility model only needs 1% to 2% of the manual sampling amount of direct spectrophotometry. The automatic analysis process reduces the consumption of chemical reagents year-on-year, and the generation of analytical waste liquid is greatly reduced during the sample measurement process.

[0069] The online heavy metal analyzer in water provided by this embodiment uses 2-[(5-bromo-2-pyridine)-azo]-emulsifier combined with OP emulsifier system spectrophotometry, combined with automatic control technology, small volume metering technology, photoelectric detection technology, data transmission technology, Internet of Things technology, and communication technology to realize online heavy metal antimony in water; the online heavy metal analyzer in water provided by this embodiment can be deployed at fixed sampling points. Online monitoring points can be used to extract water samples in real time through an external sampling pump on site for real-time online monitoring of heavy metal antimony. The automatic detection cycle of samples does not exceed 1 hour, and the measurement cycle can be manually set according to actual detection needs. The highly automated instrument replaces manual laboratory testing, solves a series of problems such as manual on-site sampling, manual sample storage, sample refrigeration transportation, and laboratory distribution testing, and fully guarantees the representativeness of on-site water sample monitoring.

[0070] In tin detection, the online heavy metal analyzer in water provided by this embodiment has the following beneficial effects:

[0071] The environmental industry standard laboratory analysis method "2-[(5-bromo-2-pyridine)-azo]-emulsifier combined with OP emulsifier system spectrophotometry" has been transformed into an online automatic monitoring of water quality that can be applied to heavy metal online analyzers. It has complete automatic sampling, measurement, calibration, standard solution verification, cleaning and other functions to meet the dynamic management and supervision requirements of various regions. It has a multi-level optical metering system, low reagent consumption, small amount of waste liquid, low operating costs, and remote reverse control functions.

[0072] It fully complies with the spectrophotometric method of 2-[(5-bromo-2-pyridinyl)-azo]-emulsifier combined with OP emulsifier system, and combines with the independently developed high-precision metering module. The metering liquid has high stability, stability ≤1.0%, and the linearity of testing standard solutions of different concentrations is good, and the repeatability is better than other manufacturers in the industry.

[0073] The online analyzer uses a micro-metering tube, so that the water sample consumed during sampling is only 1% to 2% of the manual sampling amount of direct spectrophotometry. The consumption of chemical reagents is also reduced year-on-year. Therefore, the generation of analytical waste liquid is greatly reduced during the entire sample measurement process, reducing environmental pollution.

[0074] Based on the above-mentioned ideal embodiments of this application, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An online heavy metal analyzer in water, characterized in that: include: An injection module, comprising a water sample valve port, a waste liquid valve port, and a reagent valve port, wherein the water sample valve port is configured to communicate with a water sample container storing a water sample, the waste liquid valve port is used to discharge waste liquid, and the reagent valve port is configured to communicate with a reagent container storing a reagent; the water sample valve port, the waste liquid valve port, and the reagent valve port can all be opened or closed independently; A metering module, comprising a metering tube for measuring the amount of liquid, the metering tube being connected to the sampling module; An absorbance detection module, which is used to detect the components of the water sample and is connected to the sampling module; A pumping module, the pumping module is connected to the metering tube, and the pumping module has a first pumping direction and a second pumping direction; when the pumping module operates in the first pumping direction, it can pump the water sample in the water sample container connected to the absorbance detection module and the injection module or the reagent in the reagent container into the metering tube; when the pumping module operates in the second pumping direction, it can pump air, the water sample or the reagent in the metering tube into the absorbance detection module or into the injection module and discharge it through the waste valve port.

2. The online heavy metal analyzer in water according to claim 1, characterized in that The absorbance detection module includes a reaction pool, a first solenoid valve and a second solenoid valve. The second solenoid valve is set on the first pipeline connecting the reaction pool to the injection module to control on and off, and the first solenoid valve is set on the second pipeline connecting the reaction pool to the atmosphere to control on and off.

3. The online heavy metal analyzer in water according to claim 1, characterized in that The sampling module further includes a blank water valve port, which is configured to be connected to a container storing blank water, and the blank water valve port can be opened or closed independently.

4. The online heavy metal analyzer in water according to claim 1, characterized in that The sampling module further includes a standard liquid valve port, which is configured to be connected to a container for storing the standard liquid, and the standard liquid valve port can be opened or closed independently.

5. The online heavy metal analyzer in water according to any one of claims 1 to 4, characterized in that: The pumping module includes a peristaltic pump, the rotor of which can rotate forward or reverse. When the rotor rotates forward, the peristaltic pump pumps liquid in a first pumping direction; when the rotor rotates reversely, the peristaltic pump pumps liquid in a second pumping direction.

6. The online heavy metal analyzer in water according to any one of claims 1 to 4, characterized in that: The online heavy metal analyzer in water further includes a heating detection module and / or a cooling detection module. The heating detection module is used to heat the water sample in the absorbance detection module, and the cooling detection module is used to cool the water sample in the absorbance detection module.

7. The online heavy metal analyzer in water according to claim 6, characterized in that: The heating detection module includes a heating wire, which is wound around the absorbance detection module to transfer heat to the liquid inside the module; The cooling detection module includes a micro fan, and the rotation of the micro fan can reduce the temperature of the liquid inside the absorbance detection module; The online heavy metal analyzer in water further comprises a temperature sensor, which is used to monitor the temperature parameters of the liquid inside the absorbance detection module in real time.

8. The online heavy metal analyzer in water according to any one of claims 1 to 4, characterized in that: The metering module further includes a signal detection circuit, which is connected to the metering tube to obtain the volume value of the liquid in the metering tube through photoelectric detection.

9. The online heavy metal analyzer in water according to any one of claims 1 to 4, characterized in that: The online heavy metal analyzer in water also includes a remote control platform module, which includes a communication module for reading and controlling real-time data between the sampling module, the metering module, the absorbance detection module and the pumping module.

10. The online heavy metal analyzer in water according to claim 9, characterized in that: The absorbance detection module includes a light-emitting diode, a photodiode and a signal detection circuit board. The light-emitting diode emits light of a specific wavelength which passes through the liquid to be tested and is absorbed by the photodiode. The light signal obtained by the photodiode is converted into an electrical signal by the signal detection circuit board for processing.

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