Device and method for automatically dissolving selenium by using electric hot plate
By designing an automated electric heating plate digestion device, and using the liquid filling part and detection unit to realize automatic liquid filling and heating control, the problem of inefficiency in the existing technology is solved and the unattended efficient sample measurement is achieved.
Patent Information
- Application Number
- CN202510983039.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2025-08-15
AI Technical Summary
The existing electric hot plate digestion method is inefficient during selenium detection, requiring manual monitoring of reactions and manual operation, and it is impossible to process multiple samples at the same time, which increases the workload of staff.
An automatic selenium digestion device for electric heating plates is designed, including a liquid adding part, a detection unit and a control unit, to realize automatic liquid adding and heating control, and automatically stop or continue operation when preset conditions are met, reducing manual intervention.
It realizes an unattended automated digestion process, improves sample measurement efficiency, reduces the work intensity of staff, and can process multiple samples at the same time.
Smart Images
Figure CN120489705A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of selenium detection, and in particular to a device and method for automatically digesting selenium on an electric heating plate. Background Art
[0002] Selenium is an essential trace element for humans and animals, possessing biological properties such as free radical scavenging, antioxidant properties, anti-aging, anti-cancer, immune enhancement, and heavy metal antagonism. Selenium in the Earth's crust is a rare element and generally does not form independent deposits in nature, but is dispersed as impurities within other minerals. Selenium in soil is extremely unevenly distributed due to factors such as geology, topography, and climate. Selenium deficiency exists to varying degrees in over 40 countries and regions worldwide. In my country, 72% of the country is selenium-deficient, with the exception of small areas with high selenium concentrations in provinces such as Shaanxi, Hubei, Sichuan, Guizhou, and Hunan. Selenium is primarily consumed through food, in addition to specialized supplements. Whether in selenium-rich or deficient regions, animal and plant products contain selenium, the concentrations varying. Therefore, research on the physiological functions of selenium, the development of selenium-rich fruits, and increasing the daily dietary selenium intake of residents in selenium-deficient regions are of great practical significance. To clearly understand the selenium content in soil samples, rock mineral samples, and surface and groundwater samples from various regions, it is often necessary to collect these samples and measure and analyze their selenium content. Currently, the primary method for detecting selenium is atomic fluorescence spectrometry. Before testing, the selenium in the sample is typically digested using a hot plate digestion method. Specifically, the sample is digested with a nitric acid-perchloric acid mixture to oxidize inorganic and organic selenium below tetravalent to hexavalent selenium. The hexavalent selenium is then reduced to tetravalent selenium via hydrochloric acid digestion, and the total selenium concentration is then measured using atomic fluorescence spectrometry.
[0003] However, during the hot plate digestion process, when digesting the sample with a nitric acid-perchloric acid mixture, manual observation is required to determine whether the sample reacts with the nitric acid-perchloric acid mixture and whether a large amount of white smoke is produced. When a large amount of white smoke is produced, hydrochloric acid is added to reduce the hexavalent selenium to tetravalent selenium. This process usually requires staff to be on duty and manually add hydrochloric acid after the conditions are met, which increases the workload of the staff and makes it impossible to simultaneously perform the measurement of multiple samples, reducing the efficiency of the selenium content measurement process. Summary of the Invention
[0004] The present invention aims to provide a device and method for automatically digesting selenium using an electric hot plate, so as to solve the technical problem of low efficiency of the electric hot plate digestion method in the prior art.
[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a device and method for automatic digestion of selenium using an electric heating plate, comprising a processing table, the processing table being provided with a plurality of placement slots for accommodating containers, the placement slots being provided with electric heating plates, the containers being used to hold samples, and the heating plates being used to heat the containers; a liquid adding portion being provided above the processing table, the liquid adding portion comprising a liquid adding gun distributed corresponding to the containers, the liquid adding gun being used to add liquid into the interior of the containers; and a detection unit being further provided, the detection unit being used to detect the reaction process of digesting selenium on the processing table, and the control unit being used to control the selenium digestion process according to the detection results of the detection unit.
[0006] The principles and advantages of this solution are: when measuring the selenium content of a sample, the sample to be tested is placed in a holding container, and the holding container is placed in a placement slot on a processing table. After the liquid adding part injects the liquid required for the reaction into the holding container according to the measuring method, the electric heating plate heats the holding container to start the reaction, and the detection unit detects the heated holding container. When the detection unit detects that the holding container reaches a preset effect, the control unit controls the electric heating plate to stop heating the holding container; then, a second liquid is added to the holding container through the liquid adding part and heated again, and the detection unit detects the second heating reaction. When the preset conditions are met, the sample selenium digestion processing is completed, and at this time, relevant staff can perform further operations on the sample in the holding container.
[0007] When the sample is subjected to selenium determination in this solution, different types of acidic liquids can be automatically added to the container through the liquid adding part, which can reduce the workload of the relevant staff. At the same time, the liquid is added by automatically injecting the liquid, so that the amount of the added liquid can be accurately controlled, ensuring the effect of sample selenium digestion while avoiding the waste of the acidic liquid required for the reaction. At the same time, in this solution, the reaction conditions in the selenium digestion process are detected by the detection unit, and the liquid adding operation of the liquid adding part and the heating of the electric heating plate are automatically controlled according to the detection results of the detection unit, so that the two liquid adding operations and heating control in the selenium digestion process can be unattended, avoiding the need for the relevant staff to monitor the reaction phenomenon in real time during the selenium digestion process, so that the determination operations of multiple samples can be carried out simultaneously, and the efficiency of the selenium content determination process in the sample is improved.
[0008] Preferably, as an improvement, the electric heating plate can be moved up and down in the height direction within the placement slot. This allows the electric heating plate to be moved downward to separate from the container when cooling is required, thereby preventing the residual heat on the electric heating plate from continuing to heat the container during the cooling process, thereby affecting the cooling effect of the container.
[0009] Preferably, as an improvement, a limiting plate is further provided in the placement groove, and the limiting plate is located above the electric heating plate; the limiting plate is made of a heat-conducting material. The container is accommodated in the placement groove, and the bottom of the container is fixed under the support of the limiting plate. The electric heating plate rises under the drive of the driving member and contacts one side of the limiting plate, thereby heating the container. After the electric heating plate is separated from the container, the container can remain fixed in position in the placement groove under the action of the limiting plate, ensuring the stability of the placement of the container while ensuring that the limiting plate can fully transfer the heat generated by the electric heating plate to the container, thereby increasing the heating area of the bottom of the container.
[0010] Preferably, as an improvement, a plurality of vibrating members are further provided around the limit plate, and the plurality of vibrating members are evenly distributed around the limit plate, so that the vibrating members can drive the limit plate to vibrate, thereby ensuring that the sample and liquid in the container are vibrated and mixed.
[0011] Preferably, as an improvement, an air inlet is provided on one side of the inner wall of the placement tank, and an air outlet is provided on the side of the inner wall of the placement tank away from the air inlet; a heat dissipation air inlet and a heat dissipation air outlet are also provided in the placement tank, and the heat dissipation air inlet and the heat dissipation air outlet are distributed opposite to each other on both sides of the electric heating plate. When it is necessary to cool the container, air can be blown into the placement tank through the air inlet, so that the heat in the container can be quickly discharged under the action of the airflow, thereby improving the cooling efficiency of the container.
[0012] Preferably, as an improvement, the liquid adding gun is provided with a first nozzle and a second nozzle at one end near the placement tank, the first nozzle being used to add the first liquid into the holding container, and the second nozzle being used to add the second liquid into the holding container. The first and second nozzles are used to deliver the first and second liquids, respectively, to ensure that the first and second liquids do not interfere with each other, to ensure the purity of the solution delivered to the holding container for reaction, and to ensure the effectiveness of the selenium digestion process.
[0013] Preferably, as an improvement, the liquid adding gun can be telescopically moved in the height direction toward or away from the placement slot. This allows the liquid adding gun to be closer to the opening of the container when adding the first liquid and the second liquid into the container, preventing liquid from splashing outward during the addition process and causing contamination of the processing environment. Furthermore, when liquid addition is not needed, the liquid adding gun can be moved upward and retracted, ensuring sufficient space at the top of the container to facilitate operation and monitoring during the selenium digestion reaction.
[0014] Preferably, as an improvement, the processing table is further provided with a waste liquid tank for collecting liquid discharged from the liquid adding gun before adding liquid. This allows the liquid adding gun to discharge waste liquid and waste gas into the waste liquid tank before performing the liquid adding operation. When the waste liquid mixed with gas at the front end of the liquid adding gun is discharged, the discharged first liquid or second liquid can be collected by the waste liquid tank, thereby preventing the discharged first liquid or second liquid from directly spilling onto the processing table surface and affecting the cleanliness of the processing environment.
[0015] A method for automatically digesting selenium using a hot plate, suitable for the above-mentioned hot plate selenium digestion device, comprises the following steps: Step 1: Place the container containing the selenium sample to be digested into the placement tank; Step 2: injecting the first liquid into the container through the liquid adding portion, and heating the container through the electric heating plate; Step 3: The detection unit detects the reaction process of the container during the heating process, and stops heating the container when it detects that the reaction of the container reaches a preset condition; Step 4: Cooling the container that has reached the preset conditions in step 3; Step 5: injecting a second liquid into the container cooled in Step 4 through the liquid adding portion, and heating the container again through the electric heating plate; Step 6: When the container in step 5 is heated to the preset condition, the sample digestion and selenium processing is completed.
[0016] Preferably, as an improvement, in step 2 and step 5, before adding the first liquid or the second liquid into the holding container, the gas and the first liquid or the second liquid at the front end of the liquid adding gun are discharged into the waste liquid tank. This avoids the presence of a large number of bubbles in the first liquid or the second liquid added to the holding container, which affects the full contact between the sample and the first liquid or the second liquid, and ensures that the sample can fully react in the first liquid or the second liquid; and the first liquid or the second liquid at the front end of the liquid adding gun is discharged to avoid the first liquid and the second liquid at the front end of the liquid adding gun from becoming deteriorated and ineffective after being exposed to air for a long time, and then being added to the holding container to affect the concentration and effectiveness of the first liquid or the second liquid required for the sample reaction.
[0017] Preferably, as an improvement, in steps 2 and 5, after the first liquid or the second liquid is added to the container, the container is vibrated by a vibrating member driving a limit plate. This allows the first liquid or the second liquid and the sample to be evenly mixed by the driving member after the first liquid or the second liquid is added, ensuring that the sample is fully in contact with the first liquid and the second liquid, thereby improving the selenium digestion process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of the structure of the electric hot plate selenium digestion device in an embodiment of the present invention.
[0019] Figure 2 Schematic diagram of the cross-sectional structure of the placement groove in an embodiment of the present invention.
[0020] Figure 3 Schematic diagram of the structure of the liquid adding gun in an embodiment of the present invention.
[0021] Figure 4 This is a flowchart of the method for digesting selenium on a hot plate in an embodiment of the present invention. DETAILED DESCRIPTION
[0022] The figure marks in the drawings of the specification include: processing table 1, placement groove 101, electric heating plate 102, driving part 103, limiting plate 104, vibrating part 105, air inlet pipe 106, exhaust pipe 107, heat dissipation air inlet pipe 108, heat dissipation air outlet pipe 109, liquid adding part 2, fixing plate 201, liquid adding gun 202, first nozzle 203, second nozzle 204, telescopic rod 205, guide part 206, holding container 3, waste liquid tank 4, waste liquid pipe 401.
[0023] The following is further described in detail through specific implementation methods: As attached Figure 1 As shown, a hot plate selenium digestion device includes a processing table 1, on which a plurality of holding containers 3 can be evenly arranged and placed. The holding containers 3 are used to hold samples to be digested with selenium, wherein the holding containers 3 can be containers such as beakers and conical flasks; a liquid adding portion 2 is provided above the processing table 1, and the liquid adding portion 2 is used to add selenium digestion reagents into the holding containers 3.
[0024] The processing table 1 includes a bracket and a table top, wherein the table top is a long strip of table top, wherein the specific structure of the processing table 1 is the existing technology and will not be described in detail here. A plurality of placement slots 101 are provided on the processing table 1, and the plurality of placement slots 101 are evenly arranged along the extension direction of the processing table 1. One end of the placement slot 101 passes through the upper surface of the processing table 1, and the other end extends into the processing table 1 along the height direction. Preferably, in this embodiment, the placement slot 101 is a cylindrical groove, and the diameter of the placement slot 101 is greater than the diameter of the container 3. When the container 3 is placed on the processing table 1, the container 3 can be fixed under the action of the placement slot 101 to prevent the container 3 from being displaced during the processing process, and the placement position of the container 3 can also be accurately positioned by the placement slot 101, which is convenient for subsequent detection of each container 3.
[0025] As attached Figure 2As shown, an electric heating plate 102 is provided at the bottom of the placement tank 101, and the electric heating plate 102 is used to heat the container 3 in the placement tank 101; the specific structure and heating method of the electric heating plate 102 are prior art and will not be described in detail here.
[0026] The electric heating plate 102 can move up and down in the height direction in the placement groove 101. Specifically, a driving member 103 is provided on the side of the electric heating plate 102 close to the bottom of the placement groove 101. The driving member 103 is used to drive the electric heating plate 102 to move up and down in the height direction in the placement groove 101, wherein the driving member 103 can be a cylinder, a hydraulic rod, an electric telescopic rod 205, a gear, etc., which can drive parts to perform linear reciprocating motion. Preferably, in the embodiment, the driving member 103 uses an electric telescopic rod 205 to drive the electric heating plate 102 to move up and down. Specifically, one end of the driving member 103 is fixedly connected to the bottom of the placement groove 101 by a bolt, and the other end of the driving member 103 is fixedly connected to the electric heating plate 102 by a bolt. The driving member 103 can be telescoped up and down in the height direction and drive the electric heating plate 102 to move up and down in the placement groove 101. The specific structure of the driving member 103 is existing technology and will not be repeated here. By moving the electric heating plate 102 up and down in the placement groove 101, when the container 3 needs to be cooled, the electric heating plate 102 can be moved downward to separate from the container 3, thereby preventing the residual heat on the electric heating plate 102 from continuing to heat the container 3 during the cooling process, thereby affecting the cooling effect of the container 3.
[0027] A limiting plate 104 is also provided within the placement groove 101, positioned above the electric heating plate 102. The limiting plate 104 is circumferentially connected to the sidewalls of the placement groove 101 and serves to support the bottom of the container 3. During use, the container 3 is accommodated within the placement groove 101, with the bottom of the container 3 secured by the support of the limiting plate 104. Driven by the driving member 103, the electric heating plate 102 rises, making contact with one side of the limiting plate 104 and heating the container 3. This ensures that after the electric heating plate 102 separates from the container 3, the limiting plate 104 maintains the container 3's position within the placement groove 101, ensuring the container 3's stability.
[0028] The limiting plate 104 is made of a heat-conducting material, such as copper or aluminum. The specific structure of the heat-conducting plate is known in the art and will not be described in detail here. The limiting plate 104 not only supports the container 3 but also ensures that the heat generated by the electric heating plate 102 is fully transferred to the container 3, thereby increasing the heated area at the bottom of the container 3.
[0029] A plurality of vibrating members 105 are further provided in the circumference of the limiting plate 104, and the plurality of vibrating members 105 are evenly distributed along the circumference of the limiting plate 104, and the vibrating members 105 are used to drive the limiting plate 104 to vibrate, and drive the containing container 3 on the limiting plate 104 to vibrate; wherein the vibrating member 105 can be a vibration motor, and the output shaft of the vibrating member 105 is in contact with the surface of the limiting plate 104, and the circumference of the limiting plate 104 and the inner wall of the placement groove 101 can be elastically connected by elastic members such as springs, so that when the vibrating member 105 drives the limiting plate 104 to vibrate, the limiting plate 104 can have a larger vibration amplitude, so as to ensure that the containing container 3 has sufficient vibration amplitude, so as to realize vibration mixing of the sample and liquid contained in the containing container 3.
[0030] An air inlet is provided on one side of the inner wall of the placement slot 101, one end of the air inlet is connected to the placement slot 101, and the other end of the placement slot 101 is connected to the air inlet pipe 106, wherein the end of the air inlet pipe 106 away from the placement slot 101 is connected to the air supply pipe, and the end of the air supply pipe away from the air inlet pipe 106 is connected to a fan, and the air supply pipe is used to transport the wind generated by the fan to the placement slot 101 through the air inlet pipe 106.
[0031] A control valve is also provided on the air inlet pipe 106. The control valve is used to control the opening and closing of the air inlet pipe 106, thereby turning the air flow in the storage tank 101 on and off. The control valve may be a solenoid valve. The specific structure and control method of the control valve are conventional and will not be described in detail here. During the digestion process, when the storage container 3 is being cooled, air can also be supplied to the storage tank 101, allowing the heat in the storage container 3 to be quickly discharged under the action of the airflow, thereby improving the cooling efficiency of the storage container 3.
[0032] An air outlet is also provided on the inner wall of the storage tank 101, away from the air inlet. One end of the air outlet is connected to the storage tank 101, and the other end of the air outlet is connected to the exhaust pipe 107. The air outlet is used to discharge the air supplied from the air inlet into the storage tank 101. This allows convection to form on both sides of the storage container 3 during the cooling process, allowing the air heated by the storage container 3 to be quickly discharged from the storage tank 101, thereby preventing the accumulation of hot air in the storage container 3 and affecting the cooling effect of the storage container 3.
[0033] A heat dissipation air inlet and a heat dissipation air outlet are also provided in the placement slot 101. The heat dissipation air inlet and the heat dissipation air outlet are distributed opposite to each other on both sides of the driving part 103 at the bottom of the placement slot 101. The heat dissipation air inlet is connected to the air supply pipe through the heat dissipation air inlet pipe 108, and the heat dissipation air outlet is connected to the exhaust pipe 107 through the heat dissipation air outlet pipe 109. The heat dissipation air inlet is used to deliver a small amount of wind to the bottom of the placement slot 101 and discharge it through the heat dissipation air outlet to achieve heat dissipation and cooling of the bottom of the placement slot 101, thereby avoiding heat accumulation at the bottom of the placement slot 101 during the heating process of the electric heating plate 102, which may cause damage to components.
[0034] The liquid adding unit 2 includes a fixed plate 201. The fixed plate 201 extends above the processing table 1 in the same direction as the processing table 1. Specifically, the fixed plate 201 can be fixedly connected to the processing table 1 via support rods. A plurality of liquid adding guns 202 are provided on the fixed plate 201. The plurality of liquid adding guns 202 are distributed on the fixed plate 201 corresponding to the placement slots 101. One end of the liquid adding gun 202 is fixedly connected to the fixed plate 201, and the other end extends in the height direction toward the placement slot 101.
[0035] A plurality of liquid adding guns 202 are arranged in a single row above the placement slots 101 along the longitudinal extension direction of the processing table 1, that is, one liquid adding gun 202 is used to add liquid to the holding containers 3 in the plurality of placement slots 101 distributed along the width direction of the processing table 1. A guide member 206 is further provided between the liquid adding gun 202 and the fixed plate 201. One side of the guide member 206 is fixedly connected to the fixed plate 201 by bolts, and the side of the guide member 206 away from the fixed plate 201 is connected to the liquid adding gun 202, wherein both ends of the guide member 206 extend outwardly along the width direction of the processing table 1, and the liquid adding gun 202 can slide along the extension direction of the guide member 206, wherein the guide member 206 can be a driving structure such as a slide rail, a screw rod structure, a rack structure or a linear motor. Preferably, in this embodiment, the guide member 206 uses a linear motor to drive the liquid adding gun 202 to move. The specific structure of the guide member 206 is prior art and will not be described in detail here. Liquid addition operations are performed on multiple containing containers 3 through one liquid adding gun 202 , so that the structure of the liquid adding part 2 can be effectively simplified, and the maintenance convenience of the liquid adding part 2 is improved.
[0036] As attached Figure 3As shown, a first nozzle 203 and a second nozzle 204 are fixedly connected to one end of the liquid adding gun 202 close to the placement tank 101 by bolts or snaps, and the first nozzle 203 and the second nozzle 204 are spaced apart on the liquid adding gun 202, wherein the input end of the first nozzle 203 is connected to the first liquid infusion tube through a pipeline, and the first liquid flows in the first liquid infusion tube. The first nozzle 203 is used to transport the first liquid in the first liquid infusion tube to the holding container 3 placed in the placement tank 101; the input end of the second nozzle 204 is connected to the second liquid infusion tube through a pipeline, and the second liquid flows in the second liquid infusion tube. The second nozzle 204 is used to transport the second liquid in the second liquid infusion tube to the holding container 3 placed in the placement tank 101; wherein the first nozzle 203 and the second nozzle 204 can be sprayed by valves such as electromagnetic control valves, and the specific structures of the first nozzle 203 and the second nozzle 204 and the specific content of liquid transportation are prior art and will not be repeated here. The first liquid and the second liquid are transported respectively by the first nozzle 203 and the second nozzle 204 to ensure that the first liquid and the second liquid do not interfere with each other, ensure the purity of the solution transported to the container 3 for reaction, and ensure the effect of selenium digestion processing.
[0037] The liquid adding gun 202 can be telescopically moved on the fixed plate 201 in the height direction toward or away from the placement tank 101. Specifically, a telescopic rod 205 is provided at one end of the liquid adding gun 202 near the fixed plate 201. One end of the telescopic rod 205 is fixedly connected to the fixed plate 201, and the other end of the telescopic rod 205 extends in the height direction toward the placement tank 101. The telescopic rod 205 can be a telescopic mechanism such as an electric telescopic rod 205 or a hydraulic rod. Preferably, in this embodiment, the telescopic rod 205 uses an electric telescopic rod 205 to drive the liquid adding gun 202 to move. The specific structure and telescopic process of the telescopic rod 205 are prior art and will not be described in detail here. This allows the liquid adding gun 202 to be closer to the opening of the holding container 3 when adding the first liquid and the second liquid to the holding container 3, thereby avoiding liquid splashing outward during the liquid addition process and causing pollution to the processing environment. When liquid addition is not needed, the liquid adding gun 202 can be moved upward and retracted to ensure that there is sufficient space at the top of the holding container 3 to facilitate operation and monitoring during the selenium digestion reaction.
[0038] A waste liquid tank 4 is also provided on the processing table 1. Both ends of the waste liquid tank 4 extend outward along the length of the processing table 1, and waste liquid pipes 401 are connected to both ends of the waste liquid tank 4. The waste liquid tank 4 is used to collect liquid discharged by the liquid adding gun 202 before adding liquid to the holding container 3. The waste liquid pipe 401 is used to transport the waste liquid collected by the waste liquid tank 4 to an external processing device. This allows the liquid adding gun 202 to discharge liquid into the waste liquid tank 4 before performing the liquid adding operation. When the liquid mixed with gas at the front end of the liquid adding gun 202 is discharged, the discharged first liquid or second liquid can be collected by the waste liquid tank 4, thereby preventing the discharged first liquid or second liquid from directly spilling onto the surface of the processing table 1 and affecting the cleanliness of the processing environment.
[0039] The apparatus further includes a detection unit for monitoring the reaction process of selenium digestion on the processing table 1. The specific detection unit includes a plurality of image acquisition modules, which are used to capture images of the processing table 1 during the reaction process of selenium digestion in real time, and analyze the smoke phenomenon of each container 3 on the processing table 1 during the reaction process based on the captured images. The image acquisition module can be a CMOS or CCD image sensor. When monitoring and analyzing the smoke phenomenon of each container 3, the smoke phenomenon can be analyzed based on the captured images using visual image analysis technology. The specific structure of the image acquisition module and the specific content of the visual image analysis are prior art and will not be described in detail here. By monitoring the smoke phenomenon during the reaction process through the image acquisition module, the position of the container 3 that generates white smoke can be located and analyzed according to the processing environment during the monitoring process. This facilitates the convenience of locating the container 3 while preventing the white smoke generated during the reaction from spreading outward and interfering with the monitoring of adjacent containers 3, thereby improving the accuracy of the monitoring results.
[0040] The apparatus further includes a control unit, which is electrically connected to the processing table 1, the liquid adding unit 2, and the detection unit. The control unit is used to control the processing table 1 to heat and cool the container 3, and the liquid adding unit 2 to add liquid to the container 3 based on the detection results of the detection unit. The control unit can be a control chip such as a microprocessor or a single-chip microcomputer to control the processing table 1 and the liquid adding unit 2. Preferably, in this embodiment, the control unit uses a single-chip microcomputer of the model STM32F103 to control the processing table 1 and the liquid adding unit 2. The specific content of the control unit controlling the processing table 1 and the liquid adding unit 2 is prior art and will not be described in detail here.
[0041] The present invention also intends to provide a method for digesting selenium on a hot plate, which is applicable to the above-mentioned device for digesting selenium on a hot plate, as shown in the attached Figure 4 As shown, the following steps are included: Step 1: Transfer the selenium sample to be digested into the holding container 3, and place the holding container 3 containing the sample into the placement slot 101 on the processing table 1; specifically, when it is necessary to test the sample for selenium content, add the sample that can digest selenium into the holding container 3 for digestion processing according to the holding container 3.
[0042] Step 2: inject the first liquid into the holding container 3 through the liquid adding part 2, and heat the holding container 3 through the electric heating plate 102; specifically, in step 2, when injecting the first liquid into the holding capacity, the control unit controls the liquid adding gun 202 to move along the width direction of the processing table 1 to the top of the corresponding holding container 3 and then move downward, and according to the content of the heated sample, the first liquid corresponding to the sample amount is injected into the holding container 3 through the first nozzle 203 on the liquid adding gun 202, wherein the first liquid can be compounded by an acidic solution such as nitric acid, perchloric acid, etc., wherein the specific composition and ratio of the first liquid are prior art and will not be repeated here; After the first liquid is injected, the liquid adding gun 202 is moved upward, and the control unit controls the electric heating plate 102 in the placement groove 101 to move upward, so that the surface of the electric heating plate 102 contacts the bottom of the limiting plate 104. The limiting plate 104 then directs the heat generated by the electric heating plate 102 to the holding container 3, thereby heating the holding container 3. In step 2, when heating the holding container 3, the electric heating plate 102 can be set to a corresponding heating temperature according to the sample decomposition requirements. Preferably, in this embodiment, the holding container 3 is heated at a temperature of 160°C.
[0043] Step three, the detection unit detects the reaction process of the holding container 3 during the heating process, and stops heating the holding container 3 when it is detected that the reaction of the holding container 3 reaches the preset conditions; specifically, when the detection unit detects the reaction process, it collects the reaction image of the corresponding area at a fixed position, and analyzes whether the holding container 3 generates a large amount of white smoke during the heating process through image visual analysis technology based on the collected image. When the holding container 3 generates a large amount of white smoke during the heating process, the detection unit sends the position information of the corresponding holding container 3 to the control unit, and the control unit performs the next step on the holding container 3. The specific content of determining whether the holding container 3 generates a large amount of white smoke based on the collected image through image visual analysis technology is existing technology and will not be repeated here.
[0044] In step three, when the position information of the containing container 3 is determined by the detection unit, since the position corresponding to each image acquisition module is fixed, the placement slot 101 corresponding to each image acquisition module in the detection unit can be numbered according to the position. When the position information needs to be sent, the position number of the placement slot 101 corresponding to the containing container 3 that meets the conditions is sent to the control unit. The control unit can determine the position of the placement slot 101 according to the position number information to proceed to the next step.
[0045] Step 4, cooling the holding container 3; specifically, when cooling the holding container 3, the control unit stops heating the electric heating plate 102 in the corresponding placement slot 101 according to the position information sent by the detection unit in step 3, and controls the driving member 103 at the bottom of the electric heating plate 102 to drive the electric heating plate 102 to move downward, so that the electric heating plate 102 is separated from the limit plate 104; and opens the control valve on the air inlet to supply air into the placement slot 101 through the air inlet to cool the holding container 3.
[0046] Step 5: inject a second liquid into the holding container 3 through the liquid adding part 2, and heat the holding container 3 again through the electric heating plate 102; specifically, after the holding container 3 is cooled to a preset time in step 4, the control unit controls the liquid adding gun 202 to move along the width direction of the processing table 1 to the top of the corresponding holding container 3 and then moves downward, and according to the content of the heated sample, the second liquid corresponding to the sample amount is injected into the holding container 3 through the second nozzle 204 on the liquid adding gun 202, wherein the second liquid can be composed of components such as hydrochloric acid, wherein the specific composition and ratio of the second liquid are prior art and will not be repeated here; After the second liquid is injected, the liquid adding gun 202 is moved upward, and the control unit controls the electric heating plate 102 in the placement groove 101 to move upward, so that the surface of the electric heating plate 102 contacts the bottom of the limiting plate 104. The limiting plate 104 then directs the heat generated by the electric heating plate 102 to the holding container 3, thereby heating the holding container 3. In step five, the heating temperature when heating the holding container 3 can be set to the corresponding heating temperature according to the sample decomposition requirements. Preferably, in this embodiment, the holding container 3 is heated at a temperature of 100°C.
[0047] Step 6: After the holding container 3 in step 5 is heated to the preset condition, the sample digestion and selenium processing is completed. Specifically, after the heating time in step 5 reaches the preset value, preferably in the present embodiment, the heating time of step 5 is 10 minutes, the heating plate is turned off for heating, and the heating plate is moved downward to separate from the limit plate 104. After the holding container 3 is initially cooled by air supply into the placement groove 101 through the air inlet, a prompt message is issued through a device such as an indicator light or a buzzer to prompt the relevant staff to do the next step of the sample after the selenium digestion is completed. The specific content of the prompt message issued by the prompt device is prior art and will not be repeated here.
[0048] In steps 2 and 5, before adding the first liquid or the second liquid to the holding container 3, the gas and the first liquid or the second liquid in the front end of the liquid adding gun 202 are discharged into the waste liquid tank 4. This avoids the presence of a large number of bubbles in the first liquid or the second liquid added to the holding container 3, which would affect the full contact between the sample and the first liquid or the second liquid, and ensures that the sample can fully react in the first liquid or the second liquid. In addition, the first liquid or the second liquid in the front end of the liquid adding gun 202 is discharged to avoid the first liquid or the second liquid in the front end of the liquid adding gun 202 from deteriorating and becoming ineffective after prolonged contact with air, and then being added to the holding container 3 to affect the concentration and effectiveness of the first liquid or the second liquid required for the sample reaction.
[0049] In steps 2 and 5, after the first liquid or the second liquid is added to the container 3, the vibrating member 105 drives the limiting plate 104 to vibrate the container 3. After the first liquid or the second liquid is added, the first liquid or the second liquid and the sample are shaken and mixed evenly under the drive of the driving member 103, ensuring that the sample is fully in contact with the first liquid and the second liquid, thereby improving the processing effect of digesting selenium.
[0050] Compared with the existing technology, in this solution, when the selenium sample is measured again, different types of acidic liquids can be automatically added to the holding container through the liquid adding part, which can reduce the workload of relevant staff. In addition, in this solution, the reaction conditions in the selenium digestion process are detected by the detection unit, and the liquid adding operation of the liquid adding part and the heating of the electric heating plate are automatically controlled by the control unit according to the detection results of the detection unit, so that the two liquid adding operations and heating control in the selenium digestion process can be unattended, avoiding the need for relevant staff to monitor the reaction phenomena in real time during the selenium digestion process, so that the measurement operations of multiple samples can be carried out simultaneously, thereby improving the efficiency of the selenium content measurement process in the sample.
[0051] At the same time, this solution automatically controls the reaction process, so that in actual use, according to actual needs, it is only necessary to transmit the parameter information required for the pre-treatment of other types of samples such as heating and acid addition to the control unit, and adjust the type of liquid added to the liquid adding part as needed. The present device and method control and monitor the relevant steps of the sample processing, so that the present device can automatically process a variety of samples according to actual needs, improve the flexibility of the device during use and the matching degree when processing different samples, avoid the need to configure multiple devices for processing different samples during actual use, and reduce the cost of sample measurement and processing.
[0052] It should be noted that those skilled in the art may make a number of variations and improvements without departing from the technical solution of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed by this application shall be based on the content of the claims, and the specific embodiments and other descriptions in the specification may be used to interpret the content of the claims.
Claims
1. An electric hot plate automatic selenium digestion device, characterized by: It includes a processing table, which is provided with a plurality of placement slots for accommodating containers, and an electric heating plate is provided in the placement slots. The containers are used to hold samples, and the heating plate is used to heat the containers; a liquid adding part is provided above the processing table, and the liquid adding part includes a liquid adding gun distributed corresponding to the containers, and the liquid adding gun is used to add liquid into the containers; it also includes a detection unit and a control unit, the detection unit is used to detect the reaction process of digesting selenium on the processing table, and the control unit is used to control the selenium digestion process according to the detection result of the detection unit.
2. The electric hot plate automatic selenium digestion device according to claim 1, characterized in that: The electric heating plate can move up and down along the height direction in the placement groove.
3. The automatic selenium digestion device of a hot plate according to claim 2, characterized in that: A limiting plate is further provided in the placement groove, and the limiting plate is located above the electric heating plate; the limiting plate is made of heat-conducting material.
4. The automatic selenium digestion device using a hot plate according to claim 3, wherein: A plurality of vibrating members are further provided around the circumference of the limiting plate, and the plurality of vibrating members are evenly distributed along the circumference of the limiting plate.
5. The electric hot plate automatic selenium digestion device according to claim 1, characterized in that: An air inlet is provided on one side of the inner wall of the placement groove, and an air outlet is provided on the side of the inner wall of the placement groove away from the air inlet; a heat dissipation air inlet and a heat dissipation air outlet are also provided in the placement groove, and the heat dissipation air inlet and the heat dissipation air outlet are distributed facing each other on both sides of the electric heating plate.
6. The electric hot plate automatic selenium digestion device according to claim 1, characterized in that: The liquid adding gun can be moved along the width direction of the processing table, and the liquid adding gun can be telescopically moved along the height direction toward or away from the placement groove.
7. The electric hot plate automatic selenium digestion device according to claim 1, characterized in that: The processing table is also provided with a waste liquid tank, and the waste liquid tank is used to collect the liquid discharged before the liquid adding gun adds liquid.
8. A method for automatic digestion of selenium using a hot plate, suitable for use with the hot plate digestion device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Place the container containing the selenium sample to be digested into the placement tank; Step 2: injecting the first liquid into the container through the liquid adding portion, and heating the container through the electric heating plate; Step 3: The detection unit detects the reaction process of the container during the heating process, and stops heating the container when it detects that the reaction of the container reaches a preset condition; Step 4: Cooling the container that has reached the preset conditions in step 3; Step 5: injecting a second liquid into the container cooled in Step 4 through the liquid adding portion, and heating the container again through the electric heating plate; Step 6: When the container in step 5 is heated to the preset condition, the sample digestion and selenium processing is completed.
9. The method for automatic digestion of selenium using a hot plate according to claim 8, wherein: In step 2 and step 5, before adding the first liquid or the second liquid into the container, the gas at the front end of the liquid adding gun and the first liquid or the second liquid are discharged into the waste liquid tank.
10. The method for automatic digestion of selenium using a hot plate according to claim 8, wherein: In step 2 and step 5, after the first liquid or the second liquid is added into the container, the vibrating member drives the limiting plate to drive the container to vibrate.