Corrosion-resistant sampling device of ICP (inductively coupled plasma) spectrometer

Abstract

The invention belongs to the technical field of detection instrument accessory manufacturing, and particularly relates to an ICP spectrograph corrosion-resistant sample introduction device which comprises a fog chamber cavity and a fog chamber cover matched with the fog chamber cavity, a connecting pipe is arranged on the side wall of the fog chamber cavity and provided with a gas pipe connector and a liquid connector, and a torch pipe is arranged on the outer top wall of the fog chamber cavity in a communicating mode and provided with a gas pipe connector and a liquid pipe connector. The lower end of the torch pipe extends to the lower part in the fog chamber cavity, the bottom wall of the fog chamber cavity is a fog chamber cover body, a waste discharge pipe is arranged on the fog chamber cover body in a penetrating manner, and the fog chamber cavity and the fog chamber cover body are both made of polytetrafluoroethylene; the problem that an existing ICP spectrograph sampling device cannot use a solution containing hydrofluoric acid is solved.

Description

Technical Field

[0001] This application belongs to the field of manufacturing technology of testing instrument accessories, specifically a corrosion-resistant sample introduction device for an ICP spectrometer. Background Technology

[0002] Traditional ICP spectrometer sample introduction systems mostly use high-purity quartz glass, which is resistant to corrosion from common inorganic acids and has excellent transparency, making it easy to clean. It also exhibits minimal memory effect in high-concentration solutions during testing. However, it is fragile and susceptible to corrosion from alkaline solutions, especially those containing hydrofluoric acid. With industry development, many sectors, including solar photovoltaics, require the use of hydrofluoric acid to digest samples before testing. Existing sample introduction system materials are no longer adequate to meet the testing requirements of these new industries. Traditional quartz glass sample introduction systems cannot directly test fluoride-containing solutions; defluorination is required first. This process is costly and environmentally polluting, and the time-consuming defluorination process significantly impacts the timeliness of laboratory analysis. Summary of the Invention

[0003] The purpose of this application is to address the shortcomings of existing technologies by designing a corrosion-resistant sample introduction device for an ICP spectrometer using polytetrafluoroethylene (PTFE) to form the fog chamber cavity and fog chamber cover. This device is resistant to inorganic acids such as hydrochloric acid and nitric acid, corrosion-resistant hydrofluoric acid, and high-salt solutions. Through the combination of a hydrofluoric acid-resistant nebulizer and a hydrofluoric acid-resistant nebulization chamber, the application range of the instrument's test samples can be greatly expanded, solving the problem that existing ICP spectrometer sample introduction devices cannot use solutions containing hydrofluoric acid.

[0004] The above-mentioned technical objective of this application is achieved through the following technical solution: A corrosion-resistant sample introduction device for an ICP spectrometer includes a fog chamber cavity and a fog chamber cover that mates with the fog chamber cavity. A connecting pipe is provided on the side wall of the fog chamber cavity, and the connecting pipe is provided with a gas pipe connector and a liquid connector. A torch tube is connected to the outer top wall of the fog chamber cavity, and the lower end of the torch tube extends into the lower part of the fog chamber cavity. The bottom wall of the fog chamber cavity is the fog chamber cover, and a waste discharge pipe is provided through the fog chamber cover. Both the fog chamber cavity and the fog chamber cover are made of polytetrafluoroethylene.

[0005] Preferably, the inner surface of the fog chamber cover is concave.

[0006] Preferably, the endotracheal connector includes an inlet section, a delivery section, and an outlet. The axis of the inlet section and the axis of the delivery section form an acute angle. The outlet is located at the end of the delivery section facing away from the inlet section. An inner tube is coaxially arranged inside the delivery section. The end of the inner tube facing the outlet has an opening. The outer circumferential surface of the end of the inner tube facing away from the outlet is sealed to the end of the delivery section facing away from the outlet. The outlet of the inlet section communicates with the portion between the delivery section and the outer circumferential wall of the inner tube. The liquid connector is sealed to the end of the inner tube facing away from the outlet.

[0007] Preferably, the connecting pipe is equipped with a gas flow regulating device.

[0008] Preferably, the gas flow regulating device includes a switch tube seat and an actuator tube. The switch tube seat is coaxially connected to the actuator tube. The gas delivery section coaxially passes through the switch tube seat and the actuator tube. The outer circumferential surface of the actuator tube is provided with an external thread. The end of the connecting tube facing away from the mist chamber cavity is provided with an internal thread that mates with the external thread. The inner diameter of the hole gradually decreases from the end facing away from the mist chamber cavity to the end facing the mist chamber cavity. The actuator tube is elastic.

[0009] Preferably, the opening at the end of the inner tube facing the air outlet is at a predetermined distance from the air outlet.

[0010] Preferably, the inner diameter of the air outlet is smaller than the inner diameter of the air delivery section.

[0011] The beneficial effects of this application are: This application utilizes polytetrafluoroethylene (PTFE) material, making it resistant to inorganic acids such as hydrochloric acid and nitric acid, corrosive hydrofluoric acid, and high-salt solutions. Through the combination of a hydrofluoric acid-resistant nebulizer and a hydrofluoric acid-resistant nebulization chamber, the application range of the instrument's test samples can be greatly expanded. It can be widely used in emerging industries containing fluorine, such as solar photovoltaic. Traditional quartz glass sample introduction systems cannot directly test fluorine-containing solutions; defluorination is required first. On the one hand, defluorinating agents are expensive and pollute the environment; on the other hand, the defluorination process is time-consuming, seriously affecting the timeliness of laboratory analysis. The corrosion-resistant, multi-purpose sample introduction system can be widely used for testing fluorine-containing solutions, various inorganic acids, various salts, and organic samples. Furthermore, the nebulization chamber features a detachable design, allowing for regular maintenance and preventing sample residue, greatly increasing test accuracy. The development and use of this sample introduction system significantly increases the applicability of the spectrometer in specialized industries. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Sectional view of AA in the middle; Figure 4 for Figure 2 Cross-sectional view of the middle section (BB); Figure 5 This is a three-dimensional structural diagram of the switch socket and the actuator.

[0013] The components are: 1. Fog chamber cavity; 2. Fog chamber cover; 3. Connecting pipe; 4. Liquid connector; 5. Torch tube; 6. Waste discharge pipe; 7. Air inlet section; 8. Air delivery section; 9. Air outlet; 10. Switch tube socket; 11. Actuator tube; 12. Inner tube; 13. Slot. Detailed Implementation

[0014] like Figure 1-5 As shown, a corrosion-resistant sample introduction device for an ICP spectrometer includes a fog chamber 1 and a fog chamber cover 2 that cooperates with the fog chamber 1. A connecting pipe 3 is provided on the side wall of the fog chamber 1. The connecting pipe 3 is provided with a gas pipe connector and a liquid connector 4. A torch tube 5 is connected to the outer top wall of the fog chamber 1. The lower end of the torch tube 5 extends into the lower part of the fog chamber 1. The bottom wall of the fog chamber 1 is the fog chamber cover 2. A waste discharge pipe 6 is provided through the fog chamber cover 2. Both the fog chamber 1 and the fog chamber cover 2 are made of polytetrafluoroethylene.

[0015] In this embodiment, the end of the torch 5 located outside the fog chamber 1 generates a flame. The liquid connector 4 is used to inject the sample solution into the fog chamber 1, and the gas connector is used to inject argon gas into the fog chamber 1. The sample solution and argon gas enter the fog chamber 1 and are atomized. After atomization, they rise to the top of the torch 5 to generate a plasma flame. The waste drain pipe 6 is used to discharge the waste liquid in the fog chamber 1. The purpose of using polytetrafluoroethylene (PTFE) is to make the fog chamber 1 and fog chamber cover 2 resistant to inorganic acids such as hydrochloric acid and nitric acid, corrosive hydrofluoric acid, and high-salt solutions. The detachable connection between the fog chamber cover 2 and the fog chamber 1 facilitates cleaning and washing of residual liquid inside the fog chamber 1. The extension of the lower end of the torch 5 into the lower part of the mist chamber 1 is crucial. In traditional sample introduction devices, the lower end of the torch 5 only connects to the interior of the mist chamber 1. This means that during the atomization of the sample solution and argon, the generated atomized gas directly enters the torch 5, leading to instability. A fast atomization speed results in a large flame, while a slow speed results in a small flame. This flame instability affects the detection capabilities of the ICP spectrometer. In this application, however, the lower end of the torch 5 extends into the lower part of the mist chamber 1, and the connecting pipe 3 is located on the side wall of the mist chamber 1. The connection point between the connecting pipe 3 and the mist chamber 1 is higher than the lower end of the torch 5. Therefore, the atomized gas accumulates within the mist chamber 1, first accumulating at the bottom of the mist chamber 1 and then at the top of the torch 5, resulting in greater stability.

[0016] As a preferred embodiment, the inner surface of the mist chamber cover 2 is concave. This design facilitates the concentration of waste liquid in the center of the inner surface of the mist chamber cover 2, allowing the waste discharge pipe 6 to completely drain the waste liquid.

[0017] In a preferred embodiment, the gas pipe connector includes an inlet section 7, a delivery section 8, and an outlet 9. The axis of the inlet section 7 and the axis of the delivery section 8 form an acute angle. The outlet 9 is located on the delivery section 8 at the end facing away from the inlet section 7. An inner tube 12 is coaxially arranged inside the delivery section 8, with an opening at the end facing the outlet 9. The outer circumferential surface of the inner tube 12 at the end facing away from the outlet 9 is sealed to the end of the delivery section 8 facing away from the outlet 9. The outlet end of the inlet section 7 communicates with the portion between the delivery section 8 and the outer circumferential wall of the inner tube 12. The liquid connector 4 is sealed to the end of the inner tube 12 facing away from the outlet 9. With this design, the sample liquid is delivered through the inner tube 12, and argon gas enters the delivery section 8 through the inlet section 7. At the outlet 9, the sample liquid and argon gas are mixed and atomized, entering the mist chamber 1. The angle between the axis of the inlet section 7 and the axis of the gas delivery section 8 is designed to prevent interference when the connecting pipe 3 connects to the sample liquid source and the argon source.

[0018] As a preferred embodiment, the connecting pipe 3 is equipped with a gas flow regulating device.

[0019] In a preferred embodiment, the gas flow regulating device includes a switch seat 10 and an actuator 11. The switch seat 10 is coaxially connected to the actuator 11. The gas delivery section 8 coaxially passes through the switch seat 10 and the actuator 11. The actuator 11 has an external thread on its outer circumference. The connecting pipe 3 has an internal thread that mates with the external thread at its end facing away from the mist chamber 2. The inner diameter of the hole with the internal thread in the connecting pipe 3 gradually decreases from the end facing away from the mist chamber 1 to the end facing the mist chamber 1. The actuator 11 is elastic, and a groove 13 is provided on its axial direction, allowing the inner diameter of the actuator 11 to be changed. With this design, the flow rate is changed by altering the inner diameter of the gas delivery section 8 through the compression of the actuator 11. Figure 3 For example, when the switch seat 10 and the actuator 11 move to the right together, the inner diameter of the hole with the internal thread in the connecting pipe 3 gradually decreases from the end facing away from the mist chamber 1 to the end facing the mist chamber 1. This causes the actuator 11 to continuously compress the circumference of the air delivery section 8, resulting in a smaller inner diameter of the air delivery section 8. However, when the switch seat 10 and the actuator 11 move to the left together, the actuator 11, due to its own elasticity, no longer compresses the air delivery section 8 because the inner diameter of the hole with the internal thread in the connecting pipe 3 continuously increases, thus increasing the flow rate.

[0020] As a preferred embodiment, the opening at the end of the inner tube 12 facing the gas outlet 9 is at a predetermined distance from the gas outlet 9. This arrangement allows the sample liquid and argon gas to mix between the opening at the end of the inner tube 12 facing the gas outlet 9 and the gas outlet 9. Furthermore, due to this design of the inner tube 12 and the gas delivery section 8, the argon gas encapsulates the sample liquid, enabling sufficient contact between the argon gas and the sample liquid, resulting in better atomization.

[0021] As a preferred embodiment, the inner diameter of the air outlet 9 is smaller than the inner diameter of the air delivery section 8. This constricted design facilitates the input of large quantities of sample liquid, and also increases the pressure of the sample liquid flowing out of the air outlet 9, thereby facilitating atomization.

Claims

1. A corrosion-resistant sample introduction device for an ICP spectrometer, characterized in that, The device includes a fog chamber cavity (1) and a fog chamber cover (2) that cooperates with the fog chamber cavity (1). A connecting pipe (3) is provided on the side wall of the fog chamber cavity (1). The connecting pipe (3) is provided with an air pipe connector and a liquid connector (4). A torch pipe (5) is connected to the outer top wall of the fog chamber cavity (1). The lower end of the torch pipe (5) extends into the lower part of the fog chamber cavity (1). The bottom wall of the fog chamber cavity is the fog chamber cover (2). A waste discharge pipe (6) is provided through the fog chamber cover (2). Both the fog chamber cavity (1) and the fog chamber cover (2) are made of polytetrafluoroethylene.

2. The corrosion-resistant sample introduction device for an ICP spectrometer according to claim 1, characterized in that: The inner surface of the fog chamber cover (2) is concave.

3. The corrosion-resistant sample introduction device for an ICP spectrometer according to claim 1, characterized in that: The tracheal connector includes an inlet section (7), a delivery section (8), and an outlet (9). The axis of the inlet section (7) and the axis of the delivery section (8) form an angle, which is an acute angle. The outlet (9) is located on the delivery section (8) at one end facing away from the inlet section (7). An inner tube (12) is coaxially provided inside the delivery section (8). The end of the inner tube (12) facing the outlet (9) has an opening. The outer circumferential surface of the end of the inner tube (12) facing away from the outlet (9) is sealed to the end of the delivery section (8) facing away from the outlet (9). The outlet end of the inlet section (7) is connected to the portion between the delivery section (8) and the outer circumferential wall of the inner tube (12). The liquid connector (4) is sealed to the end of the inner tube (12) facing away from the outlet (9).

4. The corrosion-resistant sample introduction device for an ICP spectrometer according to claim 3, characterized in that: The connecting pipe (3) is equipped with a gas flow regulating device.

5. The corrosion-resistant sample introduction device for an ICP spectrometer according to claim 4, characterized in that: The gas flow regulating device includes a switch tube seat (10) and an actuator tube (11). The switch tube seat (10) is coaxially connected to the actuator tube (11). The gas delivery section (8) coaxially passes through the switch tube seat (10) and the actuator tube (11). The actuator tube (11) has an external thread on its outer circumference. The connecting tube (3) has an internal thread that mates with the external thread at one end facing away from the mist chamber cavity (1). The inner diameter of the hole with the internal thread on the connecting tube (3) gradually decreases from the end facing away from the mist chamber cavity (1) to the end facing the mist chamber cavity (1). The actuator tube (11) is elastic.

6. The corrosion-resistant sample introduction device for an ICP spectrometer according to claim 3, characterized in that: The opening at one end of the inner tube (12) facing the air outlet (9) is at a predetermined distance from the air outlet (9).

7. The corrosion-resistant sample introduction device for an ICP spectrometer according to claim 6, characterized in that: The inner diameter of the air outlet (9) is smaller than the inner diameter of the air delivery section (8).

Images