Transparent modularized atomic emission spectrum teaching instrument

Abstract

The invention discloses a transparent modularized atomic emission spectrum teaching instrument device. Rapid connection of a gas circuit module, a liquid circuit module and a circuit module is realized through a transparent box body and a standardized interface. The high-pressure explosion-proof gas cylinder is connected in series with the gas flow meter through the precise pressure reducing valve and then is connected to an argon inlet of the hydride generating device; the liquid storage bottle is communicated with a solution sample inlet of the hydride generating device through a silica gel pump pipe of the four-channel peristaltic pump; a gaseous product of the hydride generation device enters the point discharge device through the dryer to be excited, and the photoelectric detection device collects spectral signals in real time through a quartz window. The modules are physically coupled through quick-plug interfaces and threaded connection, and the touch screen communicates with the electric control units through data lines to form a complete teaching experiment system.

Description

Technical Field

[0001] The invention relates to the technical field of teaching instruments, and in particular to a transparent modular atomic emission spectroscopy teaching instrument device. Background Art

[0002] As an important analytical technique, atomic emission spectroscopy (OES) is widely used in fields such as chemistry, materials science, and environmental monitoring. In experimental teaching, atomic emission spectrometer is the core equipment to help students understand atomic energy level transitions, spectral characteristics, and quantitative analysis principles. However, traditional teaching instruments are mostly based on commercial or scientific research equipment, and have problems such as closed structure, complex operation, and insufficient teaching adaptability, which makes it difficult to meet the needs of experimental teaching for intuitiveness, safety, and flexibility.

[0003] At present, the atomic emission spectrometers commonly used in the teaching field mostly adopt a fixed integrated design, and their light source system (such as arc, spark or plasma generator), spectroscopic element (grating or prism) and detection module (photomultiplier tube or CCD) are usually encapsulated in a metal or opaque casing. Although this type of design can ensure the stability of the equipment, it makes it impossible for students to directly observe the direction of the light path, the sample excitation process and the spectral signal acquisition mechanism, which weakens the intuitiveness of teaching. In addition, the modularity of existing devices is low, and the components are highly integrated. Once they are partially damaged, they need to be replaced as a whole, which has high maintenance costs. In addition, due to the lack of flexible disassembly and assembly design, it is difficult for students to deepen their understanding of the working principles of the instrument through self-assembly.

[0004] Therefore, there is an urgent need for a new atomic emission spectroscopy teaching device that is transparent, modular, and intelligent in order to break through the existing technical bottleneck and improve the experimental teaching effect. Summary of the invention

[0005] The embodiment of the present application provides a transparent modular atomic emission spectroscopy teaching instrument device, which aims to solve the problems of closed structure, insufficient modularity and poor interactivity existing in traditional teaching equipment. The device significantly improves the intuitiveness, flexibility and safety of experimental teaching through transparent design, standardized module interface and portable integrated design, so that students can directly observe the whole process of atomic excitation and spectral analysis, and deeply understand the working principle of the instrument through independent disassembly and parameter adjustment, understand the simple spectrometer structure more intuitively and quickly, and become familiar with the basic operation of the spectrometer, so as to promote the full participation of students and stimulate their scientific research interest in carrying out relevant experimental courses.

[0006] In order to solve the above technical problems, the technical solution proposed in this application is:

[0007] A transparent modular atomic emission spectroscopy teaching instrument device, comprising:

[0008] Gas circuit connection module: The outlet of the high-pressure explosion-proof gas cylinder is connected to the precision pressure reducing valve through a threaded interface, the output end of the pressure reducing valve is connected to the inlet of the gas flow meter through a quick-plug connector, and the outlet of the gas flow meter is connected to the argon gas inlet at the top of the hydride generator through a pressure-resistant hose;

[0009] Liquid connection module: The hydrochloric acid solution outlet and the potassium borohydride solution outlet of the liquid storage bottle are respectively connected to the two inlet channels of the four-channel peristaltic pump through silicone pump tubes, the liquid outlet of the peristaltic pump is connected to the hydrochloric acid solution inlet and the potassium borohydride solution inlet of the hydride generator through a quick-plug connector, and the waste liquid outlet is connected to an external waste liquid collection container through a hose;

[0010] Gaseous product path module: The gaseous product outlet of the hydride generator is connected to the inlet of the dryer through a flange, and the outlet of the dryer is connected to the discharge chamber inlet of the tip discharge device through a transparent hard pipeline;

[0011] Circuit connection module: The mobile lithium battery is connected in parallel to a four-channel peristaltic pump, a touch operation screen and a high-voltage discharge unit through a power cord. The output end of the high-voltage discharge unit is connected to a tip discharge device through a high-voltage cable; the touch operation screen communicates with the photoelectric detection device through a data line to display the spectral signal in real time.

[0012] Furthermore, the waste liquid discharge outlet of the hydride generating device is sealed and connected to the primary gas-liquid separator by a tapered thread, and the outlet of the secondary gas-liquid separator is connected to the inlet of the dryer by a quick-plug connector.

[0013] Furthermore, the connecting pipeline between the discharge cavity of the tip discharge device and the dryer is a transparent polycarbonate tube with an inner diameter of 5 mm, the tube wall is marked with an airflow direction arrow, and both ends are sealed with O-rings.

[0014] Furthermore, the focusing head of the photoelectric detection device is fixed in the detection area of ​​the box through an adjustable bracket. A threaded interface is provided at the front end of the focusing head, which can adapt to quartz lenses of different focal lengths. The center of the lens is aligned with the axis of the excitation area of ​​the discharge cavity, and the deviation is ≤1mm.

[0015] Furthermore, the high-pressure explosion-proof gas cylinder 3 is made of aluminum alloy, has a capacity of 0.45L, a working pressure of 30MPa, is installed with a safety switch valve and a switching tee, the outlet is connected to a precision pressure reducing valve, and the outlet of the pressure reducing valve is connected to a gas flow meter.

[0016] Furthermore, the hydride generating reaction device is manufactured by 3D printing, and the argon gas inlet, the potassium borohydride solution inlet, the hydrochloric acid solution inlet and the waste liquid outlet are arranged in order from high to low on the side of the hydride generating reaction device.

[0017] Furthermore, the dryer is an elongated cylinder filled with anhydrous calcium chloride desiccant, and the desiccant needs to be replaced and updated after a long period of use.

[0018] Furthermore, the tip discharge device includes a discharge cavity, a tip electrode and a discharge cavity bracket. The discharge cavity entrance is connected to the dryer. Two tip electrodes are horizontally inserted into the left and right sides of the discharge cavity. Quartz sheets are attached to the front and back of the discharge cavity to make the discharge cavity airtight and transparent, which is convenient for collecting the spectrum.

[0019] Furthermore, the photoelectric detection device is a charge coupled device with a focusing head, which is aligned with the center of the tip discharge device to collect emission spectrum signals excited by microplasma in real time. A quartz plate is provided between the tip discharge device and the photoelectric detection device.

[0020] Furthermore, the four-channel peristaltic pump is powered by a mobile lithium battery, started by a touch-operated screen, and the pump speed is adjusted by an external numerical control device.

[0021] Compared with the prior art, the transparent modular atomic emission spectroscopy teaching instrument device of the present invention has achieved the following beneficial technical effects:

[0022] Improved teaching intuitiveness: The transparent structure and real-time visualization interface enable students to simultaneously observe physical processes (such as sample excitation, optical path propagation) and the corresponding spectral signal generation logic, breaking the "black box" drawbacks of traditional equipment; Flexible module expansion: Standardized interfaces and independent spectroscopic modules meet multi-level teaching needs from basic spectral cognition to advanced quantitative analysis; Optimized teaching efficiency: Allow students to focus on principle exploration rather than equipment operation, and improve the density of knowledge transfer within a unit of class hours. This device is suitable for analytical chemistry, physics, and engineering experimental teaching, especially for cultivating students' systematic cognition and practical innovation capabilities of atomic emission spectroscopy technology through the progressive learning model of "observation-disassembly-analysis". BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A three-dimensional diagram of a transparent modular atomic emission spectroscopy teaching instrument provided in an embodiment of the present invention.

[0025] Figure 2 A front view of a transparent modular atomic emission spectroscopy teaching instrument provided in an embodiment of the present invention.

[0026] Figure 3 A top view of a transparent modular atomic emission spectroscopy teaching instrument provided in an embodiment of the present invention.

[0027] Figure 4 A schematic diagram of a tip discharge device of a transparent modular atomic emission spectroscopy teaching instrument provided in an embodiment of the present invention.

[0028] Figure 5 A schematic diagram of a hydride generating device of a transparent modular atomic emission spectroscopy teaching instrument provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1-5As shown, the present application provides a transparent modular atomic emission spectroscopy teaching instrument device, including: a box body 1, a transparent partition 2, a high-pressure explosion-proof gas cylinder 3, a precision pressure reducing valve 4, a gas flow meter 5, a liquid storage bottle 6, a four-channel peristaltic pump 7, an integrated hydride generation reaction device 8, a dryer 9, a tip discharge device 10, a photoelectric detection device 11, a mobile lithium battery 12, a touch operation screen 13, and a high-voltage discharge unit 14. The high-pressure explosion-proof gas cylinder 3 is used to transport carrier gas argon to the hydride generation reaction device 10, and the carrier gas transports the target analysis element hydride to the tip discharge device 13 for excitation detection; the pressure reducing valve 4 is installed on the high-pressure explosion-proof gas cylinder 3, and is used to reduce the gas pressure output from the high-pressure explosion-proof gas cylinder 3 and maintain the stability of the outlet pressure; the gas flow meter 5 is connected to the output end of the pressure reducing valve 4, and is used to regulate the gas flow rate so that the gas flow meets the working requirements of the integrated hydride generation reaction device 8 and the tip discharge device 10; the liquid storage bottle 6 is used to contain the reducing potassium borohydride solution and hydrochloric acid solution required for the hydride generation reaction; the four-channel peristaltic pump 7 is used to continuously transport the reaction solution in the liquid storage bottle 6 to the hydride generation reaction device 8, and at the same time output the reaction waste liquid; the hydride generation reaction device 8 is used to carry out hydride The invention relates to a method for producing a micro-plasma by using a mobile lithium battery 12 and a cold vapor reaction to convert the ionic target element in the sample solution into a gaseous hydride or a gaseous atomic form; the dryer 9 is used to dry the gaseous hydride product; the tip discharge device 10 is used to excite the gaseous product to produce a characteristic atomic emission spectrum; the photoelectric detection device 11 is used to detect the characteristic atomic emission spectrum of the gaseous product and obtain the signal intensity and peak shape diagram of the characteristic emission line of the target element; the mobile lithium battery 12 is used to provide electrical energy to the four-channel peristaltic pump 7, the tip discharge device 10, the touch operation screen 13 and the boost module 14; the touch operation screen 13 is used to start and adjust the four-channel peristaltic pump 7 and the tip discharge device 10; the high-voltage discharge unit 14 is used to convert the low voltage output by the mobile lithium battery 12 into a high voltage electricity that can break through the argon gas discharge to produce micro plasma.

[0031] In the present application, the high-pressure explosion-proof gas cylinder 3 is made of aluminum alloy, has a capacity of 0.45L, a working pressure of 30MPa, is equipped with a safety switch valve and a switching tee, and the outlet is connected to a precision pressure reducing valve 4. The outlet of the pressure reducing valve is connected to a gas flow meter 5.

[0032] In the present application, the liquid storage bottle 6 is made of polytetrafluoroethylene, resistant to strong acids and alkalis, with a capacity of 500 mL, and is used to hold the hydrochloric acid solution (5% (v / v)) and potassium borohydride solution (with different concentrations depending on the elements) required for the hydride reaction. The solution needs to be prepared in advance during operation, and the potassium borohydride solution needs to be prepared on-the-spot.

[0033] In the present application, the hydride generation reaction device 8 is manufactured by 3D printing, and includes three inlets and one outlet. An argon inlet 15 is arranged at the top, and below it are respectively a potassium borohydride solution inlet 16 and a hydrochloric acid solution inlet 17, and a waste liquid outlet 18 connected to a primary gas-liquid separator is arranged at the bottom of the device. Argon gas is used as a carrier gas to push the two solutions to merge and fully react before entering the spindle-shaped primary gas-liquid separator 19 for gas-liquid separation. The generated gaseous hydride or atomic vapor has a small density and enters the secondary gas-liquid separator 20 together with the argon gas, and the waste liquid is discharged from the lower end outlet 21. The secondary gas-liquid separator can further separate the droplets entrained by the analyte airflow, and the final target analyte is output from the upper end outlet of the secondary gas-liquid separator to the dryer 9.

[0034] In the present application, the dryer 9 is an elongated cylinder filled with anhydrous calcium chloride desiccant. When used for a long time, the desiccant needs to be replaced and updated.

[0035] In the present application, the tip discharge device 10 includes a discharge cavity 21, a tip electrode 22 and a discharge cavity bracket 23. The rear end interface 24 of the discharge cavity is connected to the dryer 9. Two tip electrodes are horizontally inserted into the left and right sides of the discharge cavity, and the electrode spacing is 3 mm. Quartz plates 25 are attached to the front and back of the discharge cavity to make the discharge cavity airtight and light-transmissive, which is convenient for collecting spectra. The top of the discharge cavity is a waste outlet 24, and the exhaust gas should be connected to a fume hood or discharged to an open environment.

[0036] In the present application, the photoelectric detection device 11 is a charge coupled device with a focusing head, which is aligned with the center of the tip discharge device 10 to collect the emission spectrum signal excited by the micro plasma in real time. A quartz plate is provided between the tip discharge device 10 and the photoelectric detection device 11.

[0037] In the present application, the four-channel peristaltic pump 7 is powered by a mobile lithium battery 12, started by a touch operation screen 13, and the pump speed is adjusted by an external numerical control device.

[0038] In the present application, the touch operation screen 13 can intelligently adjust the input voltage of the four-channel peristaltic pump 7 and the high-voltage discharge unit 14 according to the independently designed operating system.

[0039] The operation process of a transparent modular atomic emission spectroscopy teaching instrument device according to an embodiment of the present application is described as follows:

[0040] 1) Basic operation of the transparent modular atomic emission spectroscopy teaching instrument:

[0041] Open the instrument cover and connect the peristaltic pump tube to the hydrochloric acid and potassium borohydride inlets and waste liquid outlet of the 3D printed hydride generator. After confirming that the built-in Ar gas cylinder of the instrument is filled with 10MPa gas, connect the Ar output end to the 3D printed hydride generator inlet, open the Ar valve, and adjust the Ar flow rate to 80-100mLmin-1. Connect the main power cord to the 24V lithium-ion mobile battery, and connect the high-voltage discharge unit to the CNC platform. Turn on the CNC platform to control the discharge program and adjust the peristaltic pump flow rate.

[0042] (2) Example analysis method for determining heavy metal mercury in water:

[0043] To obtain a stable microplasma, 5% (v / v) HCl and 0.001% (m / v) KBH4 were continuously pumped into the reaction system through the injection pump, and the emission spectrum of the blank background was obtained. For each sample analysis, 2 mL of sample or standard solution and KBH4 solution were pumped into the 3D printing device at a fixed flow rate (injection pump speed 10 rpm) for hydride generation reaction. The HCl carrier solution and argon gas together pushed the reaction products in the serpentine reaction tube to continuously pass through two gas-liquid separators (GLS), and the volatile analyte Hg 0 It is effectively separated from the solution matrix, dried with CaCl2 and excited in micro plasma. The atomic emission spectrum signal is collected by CCD spectrometer with an integration time of 200ms and quantified by peak area. If the mercury concentration of the sample is lower than the detection limit, a spike recovery experiment is required to verify the accuracy of the result.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transparent modular atomic emission spectroscopy teaching instrument device, characterized in that: include: Gas circuit connection module: the outlet of the high-pressure explosion-proof gas cylinder (3) is connected to the precision pressure reducing valve (4) through a threaded interface, the output end of the pressure reducing valve (4) is connected to the inlet of the gas flow meter (5) through a quick-plug connector, and the outlet of the gas flow meter (5) is connected to the argon gas inlet (15) at the top of the hydride generating device (8) through a pressure-resistant hose; Liquid connection module: the hydrochloric acid solution outlet and the potassium borohydride solution outlet of the liquid storage bottle (6) are respectively connected to the two injection channels of the four-channel peristaltic pump (7) through silicone pump tubes, the liquid outlet of the peristaltic pump (7) is connected to the hydrochloric acid solution injection port (17) and the potassium borohydride solution injection port (16) of the hydride generating device (8) through a quick-insert connector, and the waste liquid discharge port (18) is connected to an external waste liquid collection container through a hose; Gaseous product path module: the gaseous product outlet of the hydride generating device (8) is connected to the inlet of the dryer (9) through a flange, and the outlet of the dryer (9) is connected to the discharge chamber inlet (24) of the tip discharge device (10) through a transparent hard pipeline; Circuit connection module: a mobile lithium battery (12) is connected in parallel to a four-channel peristaltic pump (7), a touch operation screen (13) and a high-voltage discharge unit (14) via a power line; an output end of the high-voltage discharge unit (14) is connected to a tip discharge device (10) via a high-voltage cable; the touch operation screen (13) communicates with a photoelectric detection device (11) via a data line, and displays a spectrum signal in real time.

2. The device according to claim 1, characterized in that The waste liquid discharge port (18) of the hydride generating device (8) is sealed with the primary gas-liquid separator (19) by a conical thread, and the outlet of the secondary gas-liquid separator (20) is connected to the inlet of the dryer (9) via a quick-connect connector.

3. The device according to claim 1, characterized in that: The connecting pipeline between the discharge cavity (21) of the tip discharge device (10) and the dryer (9) is a transparent polycarbonate tube with an inner diameter of 5 mm, the tube wall is marked with an airflow direction arrow, and both ends are sealed with O-rings.

4. The device according to claim 1, characterized in that The focusing head of the photoelectric detection device (11) is fixed in the detection area of ​​the box (1) through an adjustable bracket, and a threaded interface is provided at the front end of the focusing head to adapt to quartz lenses of different focal lengths. The center of the lens is aligned with the axis of the excitation area of ​​the discharge cavity (21), with a deviation of ≤1 mm.

5. The atomic emission spectroscopy teaching instrument device according to claim 1, characterized in that: The high-pressure explosion-proof gas cylinder (3) is made of aluminum alloy, has a capacity of 0.45L, and a working pressure of 30MPa. The outlet of the high-pressure explosion-proof gas cylinder (3) is connected to a precision pressure reducing valve (4), and the outlet of the pressure reducing valve (4) is connected to a gas flow meter (5).

6. The atomic emission spectroscopy teaching instrument device according to claim 1, characterized in that: The hydride generating reaction device (8) is manufactured by 3D printing, and an argon gas inlet (15), a potassium borohydride solution inlet (16), a hydrochloric acid solution inlet (17) and a waste liquid outlet (18) are arranged in descending order on the side of the hydride generating reaction device (8).

7. The atomic emission spectroscopy teaching instrument device according to claim 1, characterized in that: The dryer (9) is an elongated cylinder filled with anhydrous calcium chloride desiccant. When used for a long time, the desiccant needs to be replaced and updated.

8. The atomic emission spectroscopy teaching instrument device according to claim 1, characterized in that: The tip discharge device (10) comprises a discharge cavity (21), a tip electrode (22) and a discharge cavity support (23); the discharge cavity inlet (24) is connected to a dryer (9); two tip electrodes are inserted horizontally into the left and right sides of the discharge cavity; quartz plates (25) are attached to the front and back of the discharge cavity (21) so that the discharge cavity (21) is airtight and light-transmissive, thereby facilitating the collection of a spectrum.

9. The atomic emission spectroscopy teaching instrument device according to claim 1, characterized in that: The photoelectric detection device (11) is a charge coupled element with a focusing head, the focusing head is aligned with the center of the tip discharge device (10), and the emission spectrum signal excited by the micro plasma is collected in real time. A quartz plate is provided between the tip discharge device (10) and the photoelectric detection device (11).

10. The atomic emission spectroscopy teaching instrument device according to claim 1, characterized in that: The four-channel peristaltic pump (7) is powered by a mobile lithium battery (12) and is started by a touch operation screen (13), and the pump speed is adjusted by an external numerical control device.

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