A sampling and waste discharge warning device and method for an inductively coupled plasma source

Abstract

The invention discloses a sampling and waste discharge warning device and method for an inductively coupled plasma source. The device comprises: a sampling pipeline, an atomizer, a first bubble sensor, a second bubble sensor, a spray chamber, a peristaltic pump, a waste discharge pipeline, a warning control unit and an instrument control unit, wherein: the sampling pipeline is arranged between a sample solution and the atomizer, the atomizer is arranged on the spray chamber, the atomizer sprays the sampling solution to form a mist-like aerosol, the aerosol is sprayed into the spray chamber, the aerosol in the spray chamber goes out of the spray chamber through the waste discharge pipeline or enters the plasma from the aerosol outlet on the spray chamber, the first bubble sensor is arranged on the sampling pipeline, the spray chamber is connected to the waste discharge pipeline, the peristaltic pump and the second bubble sensor are arranged on the waste discharge pipeline, the waste liquid is discharged from the spray chamber through the waste discharge pipeline under the drive of the peristaltic pump, the first bubble sensor and the second bubble sensor are both connected to the warning control unit, and the warning control unit is connected to the instrument control unit.

Description

Technical Field

[0001] The invention relates to a sample injection and waste discharge warning device, which is used for an inductively coupled plasma source, and in particular to an inductively coupled plasma spectrometer, an inductively coupled plasma mass spectrometer and the like. Background Art

[0002] Inductively coupled plasma (ICP) source is used as a light source and spectrometer to form an inductively coupled plasma atomic emission spectrometer (ICP-OES), or as an ion source and mass spectrometer to form an inductively coupled plasma mass spectrometer (ICP-MS). ICP source has high temperature, strong excitation ability and small matrix effect. Whether it is used as a light source or an ion source, it is the preferred source and a key component of the instrument.

[0003] When the ICP source is working, the sample to be analyzed is usually introduced in liquid form by a peristaltic pump, and then the sample solution is atomized in the nebulizer to form a mist-like aerosol. In the spray chamber, aerosol droplets with larger diameters will collide with the inner wall of the spray chamber and settle to form waste liquid, while aerosol droplets with smaller diameters will enter the plasma along with the carrier gas. The waste liquid in the spray chamber needs to be discharged in time, otherwise it will cause the waste liquid to block the aerosol transmission channel, and the waste liquid will be blown into the plasma by the carrier gas, causing the instrument to accidentally shut down, thereby causing accidental damage to the instrument components.

[0004] If the sample injection system fails and the instrument has no sample introduced into the plasma for a long time, it will cause additional loss of high-purity argon gas and system power. Especially when the instrument is running continuously for 24 hours, the additional system loss is more prominent. Summary of the invention

[0005] The present invention provides a sample injection and waste discharge warning device and method for an inductively coupled plasma source, which are used to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned object, the present invention provides a sample injection and waste discharge warning device for an inductively coupled plasma source, comprising: a sample injection pipeline, an atomizer, a first bubble sensor, a second bubble sensor, a spray chamber, a peristaltic pump, a waste discharge pipeline, a warning control unit and an instrument control unit, wherein:

[0007] The sample injection pipeline is arranged between a sample solution and the nebulizer, and the nebulizer is installed on the spray chamber. The nebulizer sprays the sample injection solution to form a mist-like aerosol, and the aerosol is sprayed into the spray chamber. The destination of the aerosol in the spray chamber is the following (1) or (2):

[0008] (1) the aerosol collides with the inner wall of the mist chamber and settles to form waste liquid, and the waste liquid is discharged from the mist chamber through the waste discharge pipeline,

[0009] (2) the aerosol enters the plasma from the aerosol outlet on the mist chamber,

[0010] The first bubble sensor is installed on the sample inlet pipeline, the mist chamber is connected to the waste discharge pipeline, the peristaltic pump and the second bubble sensor are installed on the waste discharge pipeline, and the waste liquid is discharged from the mist chamber through the waste discharge pipeline under the drive of the peristaltic pump.

[0011] The first bubble sensor and the second bubble sensor are both connected to the early warning control unit, and the early warning control unit is connected to the instrument control unit.

[0012] In one embodiment of the present invention, the atomizer is a pneumatic atomizer, and the first bubble sensor and the second bubble sensor are photoelectric liquid sensors.

[0013] The present invention also provides a method for early warning of sample introduction and waste discharge for an inductively coupled plasma source, which is applied to the above-mentioned early warning device for sample introduction and waste discharge for an inductively coupled plasma source, and comprises the following steps:

[0014] The first bubble sensor and the second bubble sensor respectively monitor the state of the sample inlet pipeline and the waste discharge pipeline to see whether there is liquid or no liquid.

[0015] The early warning control unit records the duration t1 of the injection pipeline being in a liquid-free state, the duration t2 of the waste discharge pipeline being in a liquid-free state, and the duration t3 of the waste discharge pipeline being in a liquid state, and the early warning control unit counts, resets, and clears t1, t2, and t3 by edge triggering, and counts and accumulates t1, t2, and t3 by clock beats;

[0016] When the first bubble sensor detects that the state of the sampling pipeline changes from liquid to no liquid or from no liquid to liquid, the early warning control unit resets t1 to 0. When the clock beat point arrives, if the first bubble sensor detects that the sampling pipeline is in a liquid-free state, t1=t1+1;

[0017] When the second bubble sensor detects that the state of the waste discharge pipeline changes from liquid to no liquid or from no liquid to liquid, the early warning control unit resets both t2 and t3 to 0. When the clock beat point arrives, if the second bubble sensor detects that the waste discharge pipeline is in a liquid-free state, t2=t2+1 is set; if the second bubble sensor detects that the waste discharge pipeline is in a liquid-containing state, t3=t3+1 is set;

[0018] The early warning control unit uploads t1, t2, and t3 to the instrument control unit in real time, and the instrument control unit performs corresponding processing according to the monitored data.

[0019] In an embodiment of the present invention, the period of the clock beat is between 0.01s and 10s.

[0020] In one embodiment of the present invention, the instrument control unit is provided with a first threshold value t10, and the warning control unit is provided with a second threshold value t11.

[0021] When t1>t10 is detected, the instrument control unit will alarm the user to remind the user that the duration of the liquid-free state of the injection pipeline is abnormal. The user needs to check the injection status of the device and perform corresponding fault processing.

[0022] When it is detected that t1>t11, the early warning control unit sends a flameout instruction to the instrument control unit to put the device into a flameout standby state.

[0023] In an embodiment of the present invention, the first threshold t10 is between 20s and 200s, the second threshold t11>t10, and the second threshold t11 is between 200s and 7200s.

[0024] In one embodiment of the present invention, the instrument control unit is provided with a third threshold value t20, and the warning control unit is provided with a fourth threshold value t21.

[0025] When t2>t20 is detected, the instrument control unit will alarm the user to remind the user that the duration of the liquid-free state of the waste discharge pipeline is abnormal. The user needs to check the injection and waste discharge conditions of the device and perform corresponding fault processing.

[0026] When it is detected that t2>t21, the warning control unit sends a flameout instruction to the instrument control unit to put the device into a flameout standby state.

[0027] In an embodiment of the present invention, the third threshold t20 is between 50s and 600s, the fourth threshold t21>t20 and t21 is between 300s and 7200s.

[0028] In one embodiment of the present invention, the instrument control unit is provided with a fifth threshold value t30, and the warning control unit is provided with a sixth threshold value t31.

[0029] When t3>t30 is detected, the instrument control unit will alarm the user to remind the user that the duration of the liquid state in the injection pipeline is abnormal, and the user needs to check the injection status and waste discharge status of the device and perform corresponding fault processing;

[0030] When it is detected that t3>t31, the early warning control unit sends a flameout instruction to the instrument control unit to put the device into a flameout standby state.

[0031] In an embodiment of the present invention, the fifth threshold t30 is between 10s and 600s, the sixth threshold t31>t30 and t31 is between 100s and 3600s.

[0032] The sampling and waste discharge warning device and method for an inductively coupled plasma source provided by the present invention uses a bubble sensor, which can be installed and embedded in the liquid inlet and discharge pipelines of a traditional ICP source, and does not require additional changes to the sampling and waste discharge pipeline system of the traditional ICP source, and is very simple to use and low in cost. The present invention uses a time counting method to monitor and warn the status of the liquid inlet and discharge pipelines, has stable performance, high reliability, and can effectively solve the risk problems caused by abnormal sampling and abnormal waste discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only 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.

[0034] Figure 1 The figure is a schematic diagram of a sample injection and waste discharge warning device for an inductively coupled plasma source according to an embodiment of the present invention.

[0035] Explanation of the reference numerals: 1 - sample inlet line; 2 - nebulizer; 3 - first bubble sensor; 4 - second bubble sensor; 5 - spray chamber; 6 - peristaltic pump; 7 - waste discharge line; 8 - early warning control unit; 9 - instrument control unit; A - aerosol outlet. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0037] The sampling and waste discharge warning device and method for an inductively coupled plasma source provided by the present invention can monitor the sampling and waste discharge conditions of an ICP source, and when an abnormality occurs, protective measures such as early warning and active flameout and shutdown can be taken. Figure 1 FIG. 1 is a schematic diagram of a sample injection and waste discharge warning device for an inductively coupled plasma source according to an embodiment of the present invention. Figure 1As shown, the sample injection and waste discharge warning device for an inductively coupled plasma source provided by the present invention comprises: a sample injection pipeline 1, an atomizer 2, a first bubble sensor 3, a second bubble sensor 4, a spray chamber 5, a peristaltic pump 6, a waste discharge pipeline 7, a warning control unit 8 and an instrument control unit 9, wherein:

[0038] The sample injection pipeline 1 is arranged between a sample solution and the nebulizer 2. The nebulizer 2 is installed on the spray chamber 5. The nebulizer 2 sprays the sample solution to form a mist-like aerosol. The aerosol is sprayed into the spray chamber 5. The destination of the aerosol in the spray chamber 5 is as follows (1) or (2):

[0039] (1) The aerosol collides with the inner wall of the mist chamber 5 and settles to form waste liquid, which is discharged from the mist chamber 5 through the waste discharge pipe 7. Aerosols with larger diameters (larger particles) go to this destination.

[0040] (2) The aerosol enters the plasma from the aerosol outlet A on the mist chamber 5. Aerosols with smaller diameters (smaller particles) go to this destination.

[0041] The first bubble sensor 3 is installed on the sample inlet pipeline 1, the mist chamber 5 is connected to the waste discharge pipeline 7, the peristaltic pump 6 and the second bubble sensor 4 are installed on the waste discharge pipeline 7, and the waste liquid is discharged from the mist chamber 5 through the waste discharge pipeline 7 under the drive of the peristaltic pump 6.

[0042] The first bubble sensor 3 and the second bubble sensor 4 are both connected to the early warning control unit 8, and the early warning control unit 8 is connected to the instrument control unit 9. The first bubble sensor 3 and the second bubble sensor 4 monitor the injection state and the waste discharge state respectively.

[0043] Figure 1 In the embodiment, the nebulizer 2 can be, for example, a pneumatic nebulizer. With the pneumatic nebulizer, high-pressure argon gas is used to spray the sample solution to form a mist aerosol, and the aerosol is sprayed into the spray chamber 5. The nebulizer 5 can also be other types of nebulizers, such as an ultrasonic nebulizer, in which case the argon gas is only used as a carrier gas to blow the aerosol out of the spray chamber 5.

[0044] The first bubble sensor 3 and the second bubble sensor 4 can be, for example, photoelectric liquid sensors, which are used to sense whether there is liquid in the pipeline at the installation point and output corresponding logic level signals. Whether the output is high level when there is liquid and low level when there is no liquid, or low level when there is liquid and high level when there is no liquid, it will not affect the beneficial effects brought by the present invention.

[0045] Figure 1 The second bubble sensor 4 is installed on the exhaust pipe 7. It should be noted that the second bubble sensor 4 can be installed before the peristaltic pump 6 or after the peristaltic pump 6. Figure 1 Positions shown are limited.

[0046] The present invention also provides a method for early warning of sample injection and waste discharge for an inductively coupled plasma source, which is applied to Figure 1 The sample injection and waste discharge warning device for an inductively coupled plasma source shown includes the following steps:

[0047] The first bubble sensor 3 and the second bubble sensor 4 respectively monitor the state of the sample inlet pipeline 1 and the waste discharge pipeline 7 to see whether there is liquid or no liquid.

[0048] The early warning control unit 8 records the duration t1 of the liquid-free state of the sample injection pipeline 1, the duration t2 of the liquid-free state of the waste discharge pipeline 7, and the duration t3 of the liquid state of the waste discharge pipeline 7. The early warning control unit 8 counts, resets, and clears t1, t2, and t3 by edge triggering, and counts and accumulates t1, t2, and t3 by clock beats, wherein the period of the clock beat is preferably between 0.01s and 10s;

[0049] When the first bubble sensor 3 detects that the state of the sampling pipeline 1 changes from liquid to no liquid or from no liquid to liquid, the early warning control unit 8 resets t1 to 0. When the clock beat point arrives, if the first bubble sensor 3 detects that the sampling pipeline 1 is in a liquid-free state, t1=t1+1;

[0050] When the second bubble sensor 4 detects that the state of the waste discharge pipeline 7 changes from liquid to no liquid or from no liquid to liquid, the early warning control unit 8 resets both t2 and t3 to 0. When the clock beat point arrives, if the second bubble sensor 4 detects that the waste discharge pipeline 7 is in a liquid-free state, t2=t2+1 is set; if the second bubble sensor 4 detects that the waste discharge pipeline 7 is in a liquid state, t3=t3+1 is set;

[0051] The early warning control unit 8 uploads t1, t2, and t3 to the instrument control unit 9 in real time, and the instrument control unit 9 performs corresponding processing according to the monitored data.

[0052] The control process of the early warning control unit 8 and the instrument control unit 9 for the present invention is specifically as follows (1) to (3):

[0053] (1) The duration t1 of the liquid-free state of the injection line 1 is related to the thickness of the injection system pipeline, the speed of the peristaltic pump, and the configuration of the injection system. The liquid-free state of the injection line usually occurs during the sample switching and waiting time. The liquid-free state duration t1 is usually between 1 and 20 seconds. Therefore, the control process is as follows:

[0054] The instrument control unit 9 is provided with a first threshold value t10, and the warning control unit 8 is provided with a second threshold value t11.

[0055] When t1>t10 is detected, the instrument control unit 9 will warn the user that the duration of the liquid-free state of the injection pipeline 1 is abnormal. The user needs to check the injection status of the device and perform corresponding fault processing.

[0056] When it is detected that t1>t11, the warning control unit 8 sends a flameout instruction to the instrument control unit 9 to put the device into a flameout standby state.

[0057] The first threshold t10 is preferably between 20s and 200s, the second threshold t11>t10 and the second threshold t11 is preferably between 200s and 7200s.

[0058] (2) The duration t2 of the liquid-free state of the waste pipe 7 is usually longer than the liquid-free duration t1 of the injection pipe 1. Especially when the solution extraction speed of the injection system is relatively slow, t2 will far exceed t1. The liquid-free duration t2 of the discharge pipe is usually between 10 and 600 seconds. Therefore, the following control process is adopted:

[0059] The instrument control unit 9 is provided with a third threshold value t20, and the warning control unit 8 is provided with a fourth threshold value t21.

[0060] When t2>t20 is detected, the instrument control unit 9 will warn the user that the duration of the liquid-free state of the waste discharge pipeline 7 is abnormal. The user needs to check the injection and waste discharge conditions of the device and perform corresponding fault processing.

[0061] When it is detected that t2>t21, the warning control unit 8 sends a flameout instruction to the instrument control unit 9 to put the device into a flameout standby state.

[0062] The third threshold t20 is preferably between 50s and 600s, the fourth threshold t21>t20 and t21 is preferably between 300s and 7200s.

[0063] (3) When the waste discharge pipeline 7 is normally discharged, a continuous liquid segment-bubble segment flow state will be formed in the waste discharge pipeline 7. The duration t3 of the liquid state in the waste discharge pipeline 7 usually does not exceed 10s. Therefore, the following control process is performed:

[0064] The instrument control unit 9 is provided with a fifth threshold value t30, and the warning control unit 8 is provided with a sixth threshold value t31.

[0065] When t3>t30 is detected, the instrument control unit 9 warns the user that the duration of the liquid state in the injection pipeline 1 is abnormal, and the user needs to check the injection status and waste discharge status of the device and perform corresponding fault processing;

[0066] When it is detected that t3>t31, the warning control unit 8 sends a flameout instruction to the instrument control unit 9 to put the device into a flameout standby state.

[0067] The fifth threshold t30 is preferably between 10s and 600s, the sixth threshold t31>t30 and t31 is preferably between 100s and 3600s.

[0068] When the device enters the flameout standby state, it no longer consumes additional argon gas and electricity, and stops the sampling and drainage functions of the peristaltic pump, etc., to prevent the risk of chemical hazards caused by sample overflow or pipeline leakage.

[0069] The sampling and waste discharge warning device and method for an inductively coupled plasma source provided by the present invention uses a bubble sensor, which can be installed and embedded in the liquid inlet and discharge pipelines of a traditional ICP source, and does not require additional changes to the sampling and waste discharge pipeline system of the traditional ICP source, and is very simple to use and low in cost. The present invention uses a time counting method to monitor and warn the status of the liquid inlet and discharge pipelines, has stable performance, high reliability, and can effectively solve the risk problems caused by abnormal sampling and abnormal waste discharge.

[0070] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0071] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0072] 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 sample injection and waste discharge warning device for an inductively coupled plasma source, characterized in that: include: Injection pipeline, nebulizer, first bubble sensor, second bubble sensor, spray chamber, peristaltic pump, waste pipeline, early warning control unit and instrument control unit, wherein: The sample injection pipeline is arranged between a sample solution and the nebulizer, and the nebulizer is installed on the spray chamber. The nebulizer sprays the sample injection solution to form a mist-like aerosol, and the aerosol is sprayed into the spray chamber. The destination of the aerosol in the spray chamber is the following (1) or (2): (1) the aerosol collides with the inner wall of the mist chamber and settles to form waste liquid, and the waste liquid is discharged from the mist chamber through the waste discharge pipeline, (2) the aerosol enters the plasma from the aerosol outlet on the mist chamber, The first bubble sensor is installed on the sample inlet pipeline, the mist chamber is connected to the waste discharge pipeline, the peristaltic pump and the second bubble sensor are installed on the waste discharge pipeline, and the waste liquid is discharged from the mist chamber through the waste discharge pipeline under the drive of the peristaltic pump. The first bubble sensor and the second bubble sensor are both connected to the early warning control unit, and the early warning control unit is connected to the instrument control unit. The first bubble sensor and the second bubble sensor respectively monitor the state of the sample inlet pipeline and the waste discharge pipeline to see whether there is liquid or no liquid. The early warning control unit records the duration t1 of the injection pipeline being in a liquid-free state, the duration t2 of the waste discharge pipeline being in a liquid-free state, and the duration t3 of the waste discharge pipeline being in a liquid state, and the early warning control unit counts, resets, and clears t1, t2, and t3 by edge triggering, and counts and accumulates t1, t2, and t3 by clock beats; When the first bubble sensor detects that the state of the sampling pipeline changes from liquid to no liquid or from no liquid to liquid, the early warning control unit resets t1 to 0. When the clock beat point arrives, if the first bubble sensor detects that the sampling pipeline is in a liquid-free state, t1=t1+1; When the second bubble sensor detects that the state of the waste discharge pipeline changes from liquid to no liquid or from no liquid to liquid, the early warning control unit resets both t2 and t3 to 0. When the clock beat point arrives, if the second bubble sensor detects that the waste discharge pipeline is in a liquid-free state, t2=t2+1 is set; if the second bubble sensor detects that the waste discharge pipeline is in a liquid-containing state, t3=t3+1 is set; The early warning control unit uploads t1, t2, and t3 to the instrument control unit in real time, and the instrument control unit performs corresponding processing according to the monitored data.

2. The sampling and waste discharge warning device for an inductively coupled plasma source according to claim 1, characterized in that: The atomizer is a pneumatic atomizer, and the first bubble sensor and the second bubble sensor are photoelectric liquid sensors.

3. A method for early warning of sample injection and waste discharge of an inductively coupled plasma source, the method being applied to the device according to any one of claims 1 to 2, characterized in that: The following steps are involved: The first bubble sensor and the second bubble sensor respectively monitor the state of the sample inlet pipeline and the waste discharge pipeline to see whether there is liquid or no liquid. The early warning control unit records the duration t1 of the injection pipeline being in a liquid-free state, the duration t2 of the waste discharge pipeline being in a liquid-free state, and the duration t3 of the waste discharge pipeline being in a liquid state, and the early warning control unit counts, resets, and clears t1, t2, and t3 by edge triggering, and counts and accumulates t1, t2, and t3 by clock beats; When the first bubble sensor detects that the state of the sampling pipeline changes from liquid to no liquid or from no liquid to liquid, the early warning control unit resets t1 to 0. When the clock beat point arrives, if the first bubble sensor detects that the sampling pipeline is in a liquid-free state, t1=t1+1; When the second bubble sensor detects that the state of the waste discharge pipeline changes from liquid to no liquid or from no liquid to liquid, the early warning control unit resets both t2 and t3 to 0. When the clock beat point arrives, if the second bubble sensor detects that the waste discharge pipeline is in a liquid-free state, t2=t2+1 is set; if the second bubble sensor detects that the waste discharge pipeline is in a liquid-containing state, t3=t3+1 is set; The early warning control unit uploads t1, t2, and t3 to the instrument control unit in real time, and the instrument control unit performs corresponding processing according to the monitored data.

4. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 3, characterized in that: The period of the clock beat is between 0.01s and 10s.

5. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 3, characterized in that: The instrument control unit is provided with a first threshold value t10, and the warning control unit is provided with a second threshold value t11. When t1>t10 is detected, the instrument control unit will alarm the user to remind the user that the duration of the liquid-free state of the injection pipeline is abnormal. The user needs to check the injection status of the device and perform corresponding fault processing. When it is detected that t1>t11, the early warning control unit sends a flameout instruction to the instrument control unit to put the device into a flameout standby state.

6. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 5, characterized in that: The first threshold t10 is between 20s and 200s, the second threshold t11>t10, and the second threshold t11 is between 200s and 7200s.

7. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 4, characterized in that: The instrument control unit is provided with a third threshold value t20, and the warning control unit is provided with a fourth threshold value t21. When t2>t20 is detected, the instrument control unit will alarm the user to remind the user that the duration of the liquid-free state of the waste discharge pipeline is abnormal. The user needs to check the injection and waste discharge conditions of the device and perform corresponding fault processing. When it is detected that t2>t21, the warning control unit sends a flameout instruction to the instrument control unit to put the device into a flameout standby state.

8. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 7, characterized in that: The third threshold t20 is between 50s and 600s, the fourth threshold t21>t20 and t21 is between 300s and 7200s.

9. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 4, characterized in that: The instrument control unit is provided with a fifth threshold value t30, and the warning control unit is provided with a sixth threshold value t31. When t3>t30 is detected, the instrument control unit will alarm the user to remind the user that the duration of the liquid state in the injection pipeline is abnormal, and the user needs to check the injection status and waste discharge status of the device and perform corresponding fault processing; When it is detected that t3>t31, the early warning control unit sends a flameout instruction to the instrument control unit to put the device into a flameout standby state.

10. The method for early warning of sample injection and waste discharge for an inductively coupled plasma source according to claim 9, characterized in that: The fifth threshold t30 is between 10s and 600s, the sixth threshold t31>t30 and t31 is between 100s and 3600s.

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