Experimental device of atomic emission spectrometer

Abstract

The invention belongs to the technical field of teaching experiment devices, and relates to an atomic emission spectrometer experiment device which comprises a detector, a sample bottle, an aerosol generation assembly, a plasma rectangular tube and a beam splitting system. The aerosol generation assembly comprises a peristaltic pump and an atomizer, the inlet end of the peristaltic pump extracts a sample through a sample feeding pipe, the outlet end of the peristaltic pump is communicated with a sample inlet of the atomizer, the carrier gas input port is used for being connected with the carrier gas conveying assembly, and the atomizer is used for atomizing the sample and mixing the sample with carrier gas to form aerosol; a sample inlet of the plasma rectangular tube is communicated with an aerosol output port of the atomizer, and the plasma rectangular tube is used for providing energy for an aerosol sample entering the plasma rectangular tube, so that the aerosol sample realizes transition from a ground state to an excited state, and light with different wavelengths is radiated and is transmitted to the light splitting system in a light beam form; a light splitting system is used for expanding light beams according to different wavelengths, and wavelength signals of measured elements enter a detector for qualitative and quantitative analysis.

Description

Technical Field

[0001] The present invention belongs to the technical field of teaching experimental devices, and particularly relates to an experimental device for an atomic emission spectrometer. Background Art

[0002] As an important branch of modern instrumental analysis, atomic emission spectroscopy analysis technology has wide applications in the fields of materials science, environmental monitoring, biomedicine, etc. Its principle is based on the characteristic spectra generated after atoms or ions are excited for qualitative and quantitative analysis. This process involves complex energy level transitions, spectral emissions, and signal detection mechanisms. In professional courses such as chemistry and analytical instruments in colleges and universities, the atomic emission spectroscopy experiment is a key teaching link for connecting theory with practice. However, there are significant pain points in traditional teaching: on the one hand, it is difficult to enable students to establish an intuitive understanding of the abstract atomic emission principle and instrument structure through pure theoretical explanations; on the other hand, commercial atomic emission spectrometers have a closed structure and a high degree of automation in the operation process. Students can only perform programmed operations and directly obtain experimental results, but cannot truly understand the working mechanism of each component in the experiment. Their understanding of the instrument working principle remains on the surface, only based on the instillation of theoretical knowledge, and they cannot associate the key links of sample atomization, evaporation, excitation, and emission with the processing and analysis of experimental data. Often, unnecessary errors occur in the analysis of experimental data.

[0003] Existing teaching experimental devices often use simplified static models or discrete modules for demonstration, lacking the dynamic processing flow of real samples and being difficult to present the coupling effects of continuous processes such as aerosol generation, plasma excitation, and multi-wavelength spectroscopy. Students often fall into the dilemma of "knowing what it is but not knowing why" in the experiment. Especially, they cannot understand the regulation effect of the carrier gas flow rate of the nebulizer on the aerosol particle size distribution, which often causes students to ignore the influence of the change in the sample introduction state on the data, resulting in obtaining incorrect experimental data and being difficult to discover. This problem of the disconnection between theory and practice seriously restricts the cultivation of students' instrumental analysis ability, especially forming obstacles to the mastery of core skills such as spectral diagnosis technology and parameter optimization methods. Summary of the Invention

[0004] In view of this, the present invention provides an experimental device for an atomic emission spectrometer. Through a visual and interactive mode, students can more intuitively observe the influence of the sample atomization state on the sample introduction amount and data, intuitively understand the working principle of the atomic emission spectrometer, obtain more accurate experimental data, and facilitate the understanding of theoretical knowledge.

[0005] The technical solution of the present invention is as follows: An experimental device for an atomic emission spectrometer provided by the present invention includes a detector and a sample bottle, and further includes: An aerosol generation component, including a peristaltic pump and an atomizer. The inlet end of the peristaltic pump is connected to a sample bottle through a sampling tube. The outlet end of the peristaltic pump is connected to the sample inlet of the atomizer. The peristaltic pump is used to adjust the flow rate and flow volume of the sample. The atomizer is provided with a carrier gas input port, which is used to connect to a carrier gas delivery component. The atomizer is used to atomize the sample and mix it with the carrier gas to form an aerosol. A plasma torch tube, made of a transparent material. The sample inlet of the plasma torch tube is connected to the aerosol outlet of the atomizer. The plasma torch tube is used to provide energy for the evaporation and excitation of the aerosol sample entering the tube, so that the aerosol sample makes a transition from the ground state to the excited state and radiates light of different wavelengths. The light of different wavelengths is output from the outlet of the plasma torch tube. A spectroscopic system, used to collect the light beam output from the plasma torch tube, expand the light beam according to different wavelengths, and let the light signal wavelengths of the elements to be measured enter the detector for qualitative and quantitative analysis.

[0006] Preferably, the atomizer includes a first pipe fitting and a second pipe fitting. The first pipe fitting is sleeved on the second pipe fitting and there is a gap between them. One end of the first pipe fitting is provided with a nozzle, and the other end is connected to a carrier gas input pipe, which is used to connect to a carrier gas delivery component to realize the delivery of carrier gas into the gap between the first pipe fitting and the second pipe fitting. And the end of the first pipe fitting close to the carrier gas input pipe is hermetically arranged with the side wall of the second pipe fitting. One end of the second pipe fitting is connected to the outlet end of the peristaltic pump, and the other end is placed inside the nozzle. The nozzle is connected to the sample inlet of the plasma torch tube.

[0007] Preferably, the aerosol generation component further includes an atomization chamber. The inlet of the atomization chamber is connected to the nozzle of the first pipe fitting, and the outlet of the atomization chamber is connected to the sample inlet of the plasma torch tube. A waste liquid pipe is arranged at the bottom of the atomization chamber. The atomization chamber uses the carrier gas to bring the aerosol sample with small particle size into the plasma torch tube, and the aerosol sample with large particle size is discharged with the waste liquid through the waste liquid pipe.

[0008] Preferably, the plasma torch tube includes a quartz torch tube.

[0009] Preferably, an electron microscope is further included.

[0010] Preferably, a flow meter is further included. The flow meter is arranged on the carrier gas input pipe and is used to adjust and control the flow volume of the input carrier gas.

[0011] Preferably, a display screen is further included, which is electrically connected to the detector and is used to display the simulation experiment data.

[0012] Compared with the prior art, an experimental device of an atomic emission spectrometer provided by the present invention has the following beneficial effects: This experimental device is designed for teaching scenarios, constructing a fully visualized experimental platform for atomic emission spectroscopy. By modularly integrating an aerosol generation system, a transparent plasma torch tube, and a spectroscopic detection unit, the traditional closed instrument is transformed into an observable and operable teaching aid system. Specifically, this device adopts a dynamic sampling design with a peristaltic pump-nebulizer linkage, enabling students to intuitively master the hydrodynamic process of sample atomization; through the transparent plasma torch tube, the whole process of evaporation-atomization-excitation of the aerosol in the plasma torch tube is displayed in real time (i.e., the process of the plasma transitioning from the ground state to the excited state). This "dissectible" device structure breaks the "black box" mode of commercial instruments, transforming the abstract spectral excitation theory into a visible and adjustable physical process, effectively solving the teaching difficulties of the invisible spatial energy level transition and the difficult-to-track energy transfer path in traditional teaching. Moreover, through a visual and interactive method, students can deeply understand the principle of this instrument analysis technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of an aerosol generation component in an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a nebulizer in an embodiment of the present invention.

[0014] 1. Sample bottle; 2. Peristaltic pump; 3. Nebulizer; 31. First pipe fitting; 32. Second pipe fitting; 33. Nozzle; 4. Atomization chamber; 5. Plasma torch tube; 6. Spectroscopic system; 7. Display screen; 8. Carrier gas input pipe; 9. Electron microscope; 10. Flowmeter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0016] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0017] In addition, it should be noted that the connections involved in the present invention can be achieved by using conventional connection methods and do not involve any innovation.

[0018] The present invention relates to a subject of an experimental device for atomic emission spectrometers. Instrumental analysis methods are subjects that students and postgraduate students in science and engineering departments such as chemistry, materials, environment, earth and space must study. As a common instrumental analysis method, atomic spectroscopy is widely used in the quantitative analysis of metal element contents in fields such as chemical materials, environmental health, food safety, and new energy. Students' in-depth understanding of the technical principles of this instrumental analysis technique is beneficial for students to better apply this method to research in different fields.

[0019] However, current large-scale instruments are like a black box. Existing teaching experimental devices often use simplified static models or discrete modules for demonstration, lacking the dynamic processing flow of real samples and making it difficult to present the coupling effects of continuous processes such as aerosol generation, plasma excitation, and multi-wavelength spectroscopy. Students often get stuck in the dilemma of "knowing what it is but not knowing why". In particular, they are unable to understand the regulation effect of the carrier gas flow rate of the nebulizer on the aerosol particle size distribution, which often causes students to overlook the impact of changes in the sample injection state on the data, resulting in incorrect experimental data and making it difficult to discover. This problem of the disconnection between theory and practice seriously restricts the cultivation of students' instrumental analysis capabilities, especially forming obstacles to the mastery of core skills such as spectral diagnosis techniques and parameter optimization methods.

[0020] For the above reasons, the present invention provides an experimental device for atomic emission spectrometers to facilitate solving the above-mentioned technical problems. The present invention will be described in detail below with reference to the accompanying drawings.

[0021] See Figures 1 to 3As shown in the figure, an experimental device for an atomic emission spectrometer provided in this embodiment includes a frame, as well as a detector, a sample bottle 1, an aerosol generation component, a plasma torch tube 5, and a spectroscopic system 6 provided on the frame. The aerosol generation component includes a peristaltic pump 2 and an atomizer 3. The atomizer 3 has a carrier gas input port, a sample input port, and an aerosol output port. The inlet end of the peristaltic pump 2 extracts the sample through a sampling tube, and the outlet end of the peristaltic pump 2 is connected to the sample inlet of the atomizer 3. The carrier gas input port is used to connect to a carrier gas delivery component. The atomizer 3 is used to atomize the sample and mix it with the carrier gas to form an aerosol; the plasma torch tube 5 is made of a transparent material. The plasma torch tube 5 has a sample inlet, and the sample inlet is connected to the aerosol output port of the atomizer 3. The plasma torch tube 5 is used to provide energy for the evaporation and excitation of the aerosol sample entering the tube, so that the aerosol sample makes a transition from the ground state to the excited state and radiates light of different wavelengths. The light of different wavelengths is output from the outlet of the plasma torch tube 5. Preferably, the plasma torch tube 5 includes a quartz torch tube, which can be replaced by a quartz torch tube. The spectroscopic system 6 is used to collect the light beam output by the plasma torch tube 5, expand the light beam according to different wavelengths, and allow the light signal wavelengths of the elements to be measured to enter the detector for qualitative and quantitative analysis.

[0022] Specifically, the spectroscopic system 6 includes a quartz observation window provided on the side wall of the box body and a lens (convex lens or concave lens), a collimating mirror, an entrance slit, an intermediate slit, a prism, and a grating provided inside the box body. The composite light output by the plasma torch tube 5 enters the box body in the form of a light beam through the quartz observation window. Then, the composite light is successively refracted and transmitted through the lens, the collimating mirror, the prism, the entrance slit, and the intermediate slit, so as to expand the composite light according to different wavelengths. The light of different wavelengths after expansion further enters the grating, and the grating filters out the light of a specific wavelength (the wavelength of the light signal corresponding to the element to be measured) and sends it to the detector, so that the detector can perform qualitative and quantitative analysis on the received light.

[0023] See Figure 3 As shown in the figure, the atomizer 3 includes a first pipe fitting 31 and a second pipe fitting 32. The first pipe fitting 31 is sleeved on the second pipe fitting 32 and there is a gap between the two. One end of the first pipe fitting 31 is provided with a nozzle 33, and the other end is connected to a carrier gas input pipe 8. The carrier gas input pipe 8 is used to connect to a carrier gas delivery component to realize the delivery of carrier gas into the gap between the first pipe fitting 31 and the second pipe fitting 32. And the end of the first pipe fitting 31 close to the carrier gas input pipe 8 is hermetically arranged with the side wall of the second pipe fitting 32. One end of the second pipe fitting 32 is connected to the outlet end of the peristaltic pump 2, and the other end is placed inside the nozzle 33. The nozzle 33 is connected to the sample inlet of the plasma torch tube 5.

[0024] See Figure 1 and Figure 2As shown, the aerosol generation component further includes an atomization chamber 4. The inlet of the atomization chamber 4 is communicated with the nozzle 33 of the first pipe fitting 31, and the outlet of the atomization chamber 4 is communicated with the sample inlet of the plasma torch tube 5. A waste liquid pipe is arranged at the bottom of the atomization chamber 4. The atomization chamber 4 uses carrier gas to introduce the aerosol sample with small particle size into the plasma torch tube 5, and the aerosol sample with large particle size is discharged with the waste liquid through the waste liquid pipe.

[0025] See Figure 1 As shown, it further includes an electron microscope 9.

[0026] See Figure 1 As shown, it further includes a flow meter 10. The flow meter 10 is arranged on the carrier gas input pipe 8 and is used for regulating and controlling the flow rate of the input carrier gas.

[0027] See Figure 1 As shown, it further includes a display screen 7, which is electrically connected to the detector and is used for displaying simulation experiment data.

[0028] 1. Enhance the interest in the teaching process and increase students' learning interest; 2. Through a visual and interactive way, students can deeply understand the principle of this instrumental analysis technology; 3. By independently adjusting the flow rate of the carrier gas and the sample injection volume, and intuitively observing the influence of the aerosol atomization state on the injection volume and data; 4. It can be used as a popular science teaching aid to help the general public improve their scientific literacy.

[0029] Specifically, this experimental device is innovatively designed for the teaching scenario, and a full-process visual atomic emission spectroscopy experimental platform is constructed. By modularly integrating the aerosol generation system, the transparent plasma torch tube 5 and the spectral detection unit, the traditional closed instrument is transformed into an observable and operable teaching aid system. Specifically, a dynamic injection design with the peristaltic pump 2 - atomizer 3 linkage is adopted, enabling students to intuitively master the hydrodynamic process of sample atomization (i.e., the process of the plasma transitioning from the ground state to the excited state); the transparent quartz torch tube is combined with the lateral excitation light source to display the whole process of evaporation - atomization - excitation of the aerosol in the plasma in real time; the hierarchical atomization chamber 4 and the waste liquid collection device clearly present the aerosol screening mechanism. This "dissecting" device structure breaks the "black box" mode of commercial instruments, transforming the abstract spectral excitation theory into a visible and adjustable physical process, effectively solving the teaching difficulties of the invisible spatial energy level transition and the difficult - to - trace energy transfer path in traditional teaching.

[0030] This device particularly strengthens the practical teaching function of parameter adjustment: by adjusting the carrier gas flow through the external flowmeter 10, students can directly observe the influence of aerosol particle size change on the excitation efficiency; the linkage between the spectroscopic system 6 and the detector demonstrates the principle of spectral signal separation. These designs transform complex instrument parameters into interactive experimental variables, enabling students to deeply understand the core analysis methodology of "instrument condition optimization" through hands-on practice. In addition, the supporting simulation data display interface realizes real-time signal visualization, helping to establish the quantitative correlation cognition between spectral intensity and element concentration. This design concept of embedding theoretical knowledge points into the entity operation link significantly improves the teaching efficiency of complex instrument principles and provides an innovative experimental platform for cultivating analytical chemistry talents with engineering thinking.

[0031] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An experimental device for an atomic emission spectrometer, comprising a detector and a specimen bottle (1), characterized in that, Further comprising: An aerosol generation assembly, including a peristaltic pump (2) and an atomizer (3). The inlet end of the peristaltic pump (2) is connected to a sample bottle (1) through a sampling tube. The outlet end of the peristaltic pump (2) is connected to the sample inlet of the atomizer (3). The peristaltic pump (2) is used to adjust the flow rate and flow volume of the sample. An inert gas input port is provided on the atomizer (3), and the inert gas input port is used to connect to an inert gas delivery assembly. The atomizer (3) is used to atomize the sample and mix it with the inert gas to form an aerosol; A plasma torch tube (5), made of a transparent material. The sample inlet of the plasma torch tube (5) is connected to the aerosol outlet of the atomizer (3). The plasma torch tube (5) is used to provide energy for the evaporation and excitation of the aerosol sample entering the tube, so that the aerosol sample makes a transition from the ground state to the excited state and radiates light of different wavelengths. The light of different wavelengths is output from the outlet of the plasma torch tube (5); A spectroscope system (6), used to collect the light beam output by the plasma torch tube (5), expand the light beam according to different wavelengths, and allow the light signal wavelengths of the elements to be measured to enter a detector for qualitative and quantitative analysis.

2. The experimental apparatus for atomic emission spectrometer according to claim 1, wherein The atomizer (3) includes a first pipe fitting (31) and a second pipe fitting (32). The first pipe fitting (31) is sleeved on the second pipe fitting (32) and there is a gap between them. One end of the first pipe fitting (31) is provided with a nozzle (33), and the other end is connected to an inert gas input tube (8). The inert gas input tube (8) is used to connect to an inert gas delivery assembly to realize the delivery of inert gas into the gap between the first pipe fitting (31) and the second pipe fitting (32). And a sealed setting is provided between one end of the first pipe fitting (31) close to the inert gas input tube (8) and the side wall of the second pipe fitting (32). One end of the second pipe fitting (32) is connected to the outlet end of the peristaltic pump (2), and the other end is placed inside the nozzle (33). The nozzle (33) is connected to the sample inlet of the plasma torch tube (5).

3. The experimental apparatus for atomic emission spectrometers according to claim 2, characterized in that, The aerosol generation assembly further includes an atomization chamber (4). The inlet of the atomization chamber (4) is connected to the nozzle (33) of the first pipe fitting (31). The outlet of the atomization chamber (4) is connected to the sample inlet of the plasma torch tube (5). A waste liquid pipe is provided at the bottom of the atomization chamber (4). The atomization chamber (4) uses inert gas to bring the aerosol sample with small particle size into the plasma torch tube (5), and the aerosol sample with large particle size is discharged with the waste liquid through the waste liquid pipe.

4. The experimental apparatus for atomic emission spectrometer according to claim 1, characterized in that, The plasma torch tube (5) includes a quartz torch tube.

5. The experimental device of the atomic emission spectrometer according to claim 1, characterized in that Further comprising an electron microscope (9). The microscope is arranged on one side of the atomizer (3) and is used to observe the aerosol state in the atomizer (3).

6. The experimental apparatus for atomic emission spectrometer according to claim 2, characterized in that, Further comprising a flowmeter (10). The flowmeter (10) is arranged on the inert gas input tube (8) and is used to adjust and control the flow volume of the input inert gas.

7. The experimental apparatus for atomic emission spectrometer according to claim 1, characterized in that, Further comprising a display screen (7), electrically connected to the detector and used to display simulation experiment data.

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