An ion source system and an analysis system

Abstract

The application discloses an ion source system and an analysis system, and relates to the technical field of mass analysis detection. The ion source system specifically comprises a pyrolysis chamber capable of improving the concentration of a sample to be detected after pyrolysis and an ionization chamber in communication with the pyrolysis chamber and used for ionizing the sample to be detected which has completed pyrolysis and is discharged from the pyrolysis chamber into ions to be detected and discharging the ions to be detected when the ions to be detected meet a preset concentration. The ion source system is aimed at realizing output control of ions generated by the ion source system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mass analysis detection technology, in particular to an ion source system and an analysis system. BACKGROUND

[0002] At present, the commonly used ion sources of instruments include electron impact source (EI), chemical ionization source (CI), electrospray ionization source (ESI), atmospheric pressure chemical ionization source (APCI) and matrix assisted laser desorption ionization source (MALDI) and the like.

[0003] A mass analysis instrument is composed of an ion source, a mass analysis system and an ion collection and detection system. The ion source system is a system for providing ionization to a measured object. Only when the sample is ionized can it be detected by the mass spectrometer. The ion source system plays a very important role in the mass analysis instrument. The ionization ability of the ion source to the measured object directly affects the testing ability of the entire instrument. The working process of the existing ion source system is to ionize and transport ions at the same time, which cannot realize output control of the detected ions, often causing the mass analysis system to fail to obtain sufficient ion concentration and reducing the analysis ability of the mass analysis system. Therefore, how to realize output control of the ions generated by the ion source system has become a technical problem to be solved. SUMMARY

[0004] The main purpose of the present application is to provide an ion source system and an analysis system, which aims to realize output control of the ions generated by the ion source system.

[0005] In order to achieve the above purpose, the present application provides an ion source system, which comprises a pyrolysis chamber capable of improving the concentration of a measured sample after pyrolysis and an ionization chamber in communication with the pyrolysis chamber and used for ionizing the measured sample discharged from the pyrolysis chamber into detected ions and discharging the detected ions when the detected ions meet a preset concentration.

[0006] In an embodiment of the present application, a passage between the pyrolysis chamber and the ionization chamber is provided with a switch piece which opens the passage to enable the pyrolyzed measured sample to enter the ionization chamber when the concentration of the measured sample in the pyrolysis chamber meets a preset threshold after pyrolysis.

[0007] In an embodiment of the present application, an ion valve is arranged at the outlet of the ionization chamber and opens the outlet of the ionization chamber to discharge the detected ions when the concentration of the detected ions in the ionization chamber meets a preset condition.

[0008] In an embodiment of the present application, the ion valve comprises a first electrode provided at the outlet of the ionization chamber and having an electric field, and a second electrode oppositely arranged with the first electrode and capable of being switched to the same or different electric field as the first electrode to release or block the detected ions.

[0009] In an embodiment of the present application, the first electrode comprises a first bottom plate connected to the outlet of the ionization chamber, and a plurality of first conductive teeth are arranged on the first bottom plate in parallel to each other;

[0010] The second electrode comprises a second bottom plate connected to the outlet of the ionization chamber and arranged opposite to the first bottom plate, and a plurality of second conductive teeth are arranged on the second bottom plate in parallel to each other;

[0011] The plurality of first conductive teeth on the first bottom plate and the plurality of second conductive teeth on the second bottom plate are staggered and arranged, and any first conductive tooth and second conductive tooth are not in contact to achieve the blocking or passing of the ions to be detected.

[0012] In an embodiment of the present application, the planes on which the first conductive teeth and the second conductive teeth are arranged are perpendicular to the output direction of the ions to be detected in the ionization chamber.

[0013] In an embodiment of the present application, the distance between any two adjacent first conductive teeth and second conductive teeth is defined as α, and the 2mm≥α≥1mm.

[0014] In an embodiment of the present application, a telescopic groove is arranged between the pyrolysis chamber and the ionization chamber to divide the connecting channel between the pyrolysis chamber and the ionization chamber into two ends, and the switching piece is arranged in the telescopic groove and can move in the telescopic groove to open or close the connecting channel.

[0015] In an embodiment of the present application, a heating plate for heating the sample to be detected is arranged in the pyrolysis chamber, and a water cooling assembly for cooling the heating plate is arranged at the bottom of the heating plate.

[0016] The present application also discloses an analysis system, characterized in that it comprises the ion source system according to any one of the above embodiments and an analysis assembly arranged at the outlet of the ion source system for analyzing the ions generated by the ion source system.

[0017] The above technical solution can improve the concentration of the sample to be detected after pyrolysis by using the pyrolysis chamber and the ionization chamber which can ionize the sample to be detected after pyrolysis and improve the ion concentration, improve the concentration of the ions to be detected, facilitate the subsequent detection of the sample to be detected, improve the accuracy of the subsequent detection of the sample to be detected, and improve the detection limit of the subsequent detection of the sample to be detected. The structure is simple and easy to implement. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be described in detail below with reference to specific embodiments and drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of the first embodiment of the present application.

[0020] Figure 2 For Figure 1 Front view of ion valve.

[0021] Figure 3 Characteristic spectrum of sample A at 20 ppb tested by using prior art ion source device.

[0022] Figure 4 Characteristic spectrum of sample A at 2 ppb tested by using prior art ion source device.

[0023] Figure 5 Characteristic spectrum of sample A at 2 ppb tested by using ion source system of the present application. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be detailed with reference to the drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present application and do not constitute limitation to the present application.

[0025] As Figures 1 to 2 shown, in order to achieve the above-mentioned objects, the present application proposes an ion source system, comprising a pyrolysis chamber 10 capable of increasing the concentration of a to-be-tested sample after pyrolysis and an ionization chamber 20 in communication with the pyrolysis chamber 10 for ionizing the to-be-tested sample discharged from the pyrolysis chamber 10 after the pyrolysis into to-be-tested ions and discharging the to-be-tested ions after the to-be-tested ions meet a preset concentration.

[0026] Specifically, an ion source system comprises a pyrolysis chamber and an ionization chamber 20, the pyrolysis chamber is used for pyrolyzing a to-be-tested sample and increasing the concentration of the to-be-tested sample after pyrolysis, so as to increase the ionization concentration of the to-be-tested sample after pyrolysis. The ionization chamber 20 is used for ionizing the to-be-tested sample after pyrolysis and discharging the to-be-tested sample after the ionization concentration of the to-be-tested sample meets a preset condition, so as to increase the detection limit of the to-be-tested sample in subsequent detection. The detection limit refers to the minimum concentration or content of an element required to generate an analysis signal that can be reliably detected, while the determination limit refers to the limit that a specified amount analysis can actually reach.

[0027] By using the above technical solutions: through the pyrolysis chamber 10 capable of increasing the concentration of the to-be-tested sample after pyrolysis and the ionization chamber 20 capable of ionizing the to-be-tested sample after pyrolysis and increasing the ionization concentration of the to-be-tested sample, the concentration of the to-be-tested ions is increased, the detection of the to-be-tested sample in subsequent detection is facilitated, and the accuracy of the detection of the to-be-tested sample in subsequent detection is improved.

[0028] In an embodiment of the present application, a switch is arranged on a channel between the pyrolysis chamber 10 and the ionization chamber 20, and the switch is used for opening the channel to enable the to-be-tested sample after pyrolysis to enter the ionization chamber 20 when the concentration of the to-be-tested sample in the pyrolysis chamber 10 after pyrolysis meets a preset threshold.

[0029] Specifically, an ion source system includes a pyrolysis chamber 10 and an ionization chamber 20.

[0030] The pyrolysis chamber 10 is used to pyrolyze the sample 30 to be tested, so that the sample 30 to be tested is converted from a liquid or solid aggregate state to a gaseous state. The pyrolysis chamber 10 includes an inlet for the entry of a carrier gas, which can be nitrogen, clean air, and other inert gases. The outlet of the pyrolysis chamber 10 is used to discharge the sample 30 to be tested after pyrolysis, so as to facilitate the next operation of the sample 30 to be tested after pyrolysis.

[0031] The inlet of the ionization chamber 20 is connected to the outlet of the pyrolysis chamber 10, so that the sample 30 to be tested discharged from the pyrolysis chamber 10 can be input into the ionization chamber 20 for ionization. The ionization chamber 20 ionizes the sample 30 to be tested entering therein, and the ionization is performed by an ion generator, which can be a discharge ionization ion generator, a UV photoionization ion generator, a laser ionization ion generator, a radioactive ionization ion generator, etc.

[0032] A switching piece 50 is arranged at the connection between the pyrolysis chamber 10 and the ionization chamber 20, and is used to separate or conduct the ionization chamber 20 and the pyrolysis chamber 10.

[0033] The working process is that the sample 30 to be tested is first converted from a liquid or solid aggregate state to a gaseous state in the pyrolysis chamber 10. When the concentration of the sample 30 to be tested in the pyrolysis chamber meets a preset threshold, the switching piece 50 is opened, so that the gaseous sample 30 to be tested enters the ionization chamber 20 for concentrated ionization, thereby improving the ionization efficiency.

[0034] In an embodiment of the present application, an ion valve is arranged at the outlet of the ionization chamber 20, and is used to open the outlet of the ionization chamber when the concentration of the sample 30 to be tested in the ionization chamber meets a preset condition, so as to discharge the sample 30 to be tested.

[0035] Specifically, an ion source system includes a pyrolysis chamber 10 and an ionization chamber 20.

[0036] The pyrolysis chamber 10 is used to pyrolyze the sample 30 to be tested, so that the sample 30 to be tested is converted from a liquid or solid aggregate state to a gaseous state. The pyrolysis chamber 10 includes an inlet for the entry of a carrier gas, which can be nitrogen, clean air, and other inert gases. The outlet of the pyrolysis chamber 10 is used to discharge the sample 30 to be tested after pyrolysis, so as to facilitate the next operation of the sample 30 to be tested after pyrolysis.

[0037] The gas inlet of the ionization chamber 20 is connected to the gas outlet of the pyrolysis chamber 10, so that the pyrolysis-finished sample 30 discharged from the pyrolysis chamber 10 can be input into the ionization chamber 20 for ionization. The ionization chamber 20 ionizes the sample 30 entering the ionization chamber. The ionization chamber ionizes the sample 30 by an ion generator, which can be a discharge ionization ion generator, a UV photoionization ion generator, a laser ionization ion generator, a radioactive ionization ion generator, etc.

[0038] An ion valve 60 is arranged at the outlet of the ionization chamber 20, and the ion valve 60 releases the ions when the concentration of the ions in the ionization chamber 20 meets a preset condition.

[0039] The specific working process of the ion source system is as follows:

[0040] First, the sample 30 is placed in the pyrolysis chamber 10, and the sample 30 is gasified into a gaseous state by heating the pyrolysis chamber 10. When the concentration of the sample in the pyrolysis chamber 10 meets a preset threshold after pyrolysis, the switch 50 opens the gas outlet of the pyrolysis chamber 10. At this time, the gas inlet of the pyrolysis chamber 10 blows in the carrier gas, and the carrier gas blows out the gaseous sample 30 from the gas outlet of the pyrolysis chamber 10. At this time, the carrier gas carries the gaseous sample 30 from the pyrolysis chamber 10 into the ionization chamber 20. At this time, the ion generator in the ionization chamber 20 ionizes the sample 30, so that the sample 30 is ionized. Since the ionized sample 30 has an electric field effect, an ion valve 60 is arranged at the outlet of the ionization chamber 20. The electric field generated by the ion valve 60 can prevent the ionized sample 30 from passing through the ion valve 60, but the solvent for dissolving the sample and other substances that are not ionized can pass through the ion valve 60. At this time, the number of ions of the sample 30 is enriched in the ionization chamber 20. When the number of ions of the sample 30 meets a preset condition, the electric field of the ion valve 60 is changed so that the ions of the sample 30 can pass through the ion valve. This can improve the ion concentration of the sample 30 at the outlet of the ionization chamber 20, thereby facilitating the detection in the later stage.

[0041] By arranging the ion valve 60 at the output end of the ionization chamber 20, the ionized sample 30 cannot pass through the ion valve 60, but the solvent for dissolving the sample and other substances that are not ionized can pass through the ion valve 60. This can enrich the ionized sample 30 in the ionization chamber 20, thereby increasing the number of ionized samples 30 in the ionization chamber 20. This facilitates the concentration control of the ionized sample 30 in the ionization chamber 20. The structure is simple and easy to implement.

[0042] In an embodiment of the present application, the ion valve 60 comprises a first electrode provided at the outlet of the ionization chamber 20 and having an electric field, and a second electrode provided opposite to the first electrode and switchable to the same or different electric field as the first electrode to release or block the ions to be detected.

[0043] Specifically, an ion source system comprises a pyrolysis chamber 10, an ionization chamber 20, a first electrode, and a second electrode.

[0044] The pyrolysis chamber 10 is used to pyrolyze the sample 30 to be detected, so that the sample 30 to be detected is converted from a liquid or solid aggregate state to a gaseous state. The pyrolysis chamber 10 comprises an inlet for the carrier gas, which can be nitrogen, clean air, and other inert gases. The outlet of the pyrolysis chamber 10 is used to discharge the sample 30 to be detected after pyrolysis, so as to facilitate the next operation of the sample 30 to be detected after pyrolysis.

[0045] The inlet of the ionization chamber 20 is connected to the outlet of the pyrolysis chamber 10, so that the sample 30 to be detected after pyrolysis discharged from the pyrolysis chamber 10 can be input into the ionization chamber 20 for ionization. The ionization chamber 20 ionizes the sample 30 to be detected entering therein, which is ionized by an ion generator, which can be a discharge ionization ion generator, a UV photoionization ion generator, a laser ionization ion generator, a radioactive ionization ion generator, etc.

[0046] The first electrode is detachably mounted on the outlet of the ionization chamber 20. The detachable mounting facilitates the later maintenance. Of course, according to the design needs, the first electrode can also be fixedly mounted on the outlet of the ionization chamber 20, which can improve the connection strength between the first electrode and the outlet of the ionization chamber 20.

[0047] The first electrode has an electric field. The second electrode is detachably mounted on the outlet of the ionization chamber 20. The detachable mounting facilitates the later maintenance. Of course, according to the design needs, the second electrode can also be fixedly mounted on the outlet of the ionization chamber 20, which can improve the connection strength between the second electrode and the outlet of the ionization chamber 20.

[0048] The first electrode and the second electrode are provided opposite to each other, and the second electrode has the same or different electric field as the first electrode.

[0049] When the electric fields of the first electrode and the second electrode are the same, the ion valve 60 is in an open state, and the ionized sample 30 to be detected can pass through the ion valve 60.

[0050] When the electric field of the second electrode and the first electrode is not the same, the ion valve 60 is in a closed state, at this time, the ionized sample 30 to be detected cannot pass through the ion valve 60, but the solvent used to dissolve the sample 30 to be detected can pass through the ion valve 60 with the carrier gas.

[0051] By applying the same or different electric fields to the first electrode and the second electrode, the ionized sample 30 to be detected is blocked or released, and the solvent used to dissolve the sample to be detected is not blocked, thereby improving the control accuracy of the ion number of the sample 30 to be detected.

[0052] In an embodiment of the present application, the first electrode includes a first bottom plate 61 connected to the outlet of the ionization chamber 20, and a plurality of first conductive teeth 62 are arranged on the first bottom plate 61 in parallel with each other.

[0053] The second electrode includes a second bottom plate 63 connected to the outlet of the ionization chamber 20 and arranged opposite to the first bottom plate 61, and a plurality of second conductive teeth 64 are arranged on the second bottom plate 63 in parallel with each other.

[0054] The plurality of first conductive teeth 62 on the first bottom plate 61 and the plurality of second conductive teeth 64 on the second bottom plate 63 are staggered and arranged, and any first conductive tooth 62 and second conductive tooth 64 do not contact each other to block or release the ions to be detected.

[0055] Specifically, an ion source system includes a pyrolysis chamber 10, an ionization chamber 20, a first electrode, and a second electrode.

[0056] The pyrolysis chamber 10 is used to pyrolyze the sample 30 to be detected, so that the sample 30 to be detected is converted from a liquid or solid aggregate state to a gaseous state. The pyrolysis chamber 10 includes an inlet and an outlet, the inlet is used for the carrier gas to enter, and the carrier gas can be nitrogen, clean air, and other inert gases. The outlet of the pyrolysis chamber 10 is used to discharge the sample 30 to be detected after pyrolysis, thereby facilitating the next operation of the sample 30 to be detected after pyrolysis.

[0057] The inlet of the ionization chamber 20 is connected to the outlet of the pyrolysis chamber 10, so that the sample 30 to be detected after pyrolysis discharged from the pyrolysis chamber 10 can be input into the ionization chamber 20 for ionization. The ionization chamber 20 ionizes the sample 30 to be detected entering therein, and the ionization is performed by an ion generator. The ion generator can be a discharge ionization ion generator, a UV photoionization ion generator, a laser ionization ion generator, a radiation ionization ion generator, etc.

[0058] The first electrode is detachably mounted on the gas outlet of the ionization chamber 20, and is detachably mounted to facilitate later maintenance. Of course, according to the design needs, the first electrode can also be fixedly mounted on the gas outlet of the ionization chamber 20, and is fixedly mounted to improve the connection strength between the first electrode and the gas outlet of the ionization chamber 20.

[0059] The first electrode has an electric field. The second electrode is detachably mounted on the gas outlet of the ionization chamber 20, and is detachably mounted to facilitate later maintenance. Of course, according to the design needs, the second electrode can also be fixedly mounted on the gas outlet of the ionization chamber 20, and is fixedly mounted to improve the connection strength between the second electrode and the gas outlet of the ionization chamber 20.

[0060] The first electrode and the second electrode are oppositely arranged, and the second electrode has the same or different electric field as the first electrode.

[0061] The first electrode includes a first bottom plate 61 connected to the outlet of the ionization chamber 20. The first bottom plate 61 is connected to the inner wall of the outlet of the ionization chamber 20 in a detachable manner to facilitate later maintenance of the first bottom plate 61. Of course, according to the design needs, the first bottom plate 61 and the inner wall of the outlet of the ionization chamber 20 can also be connected in a fixed manner, and the fixed connection can improve the connection strength between the first bottom plate 61 and the inner wall of the outlet of the ionization chamber 20.

[0062] A plurality of first conductive teeth 62 are arranged on the same side of the first bottom plate 61 and are parallel to each other. It is conceivable that the distance between any two adjacent first conductive teeth 62 is equal.

[0063] The second electrode includes a second bottom plate 63 connected to the outlet of the ionization chamber 20. The second bottom plate 63 and the inner wall of the outlet of the ionization chamber 20 are connected in a detachable manner. The detachable connection facilitates the later maintenance of the second bottom plate 63. Of course, according to the design needs, the second bottom plate 63 and the inner wall of the outlet of the ionization chamber 20 can also be connected in a fixed manner, and the fixed connection can improve the connection strength between the second bottom plate 63 and the inner wall of the outlet of the ionization chamber 20.

[0064] A plurality of second conductive teeth 64 are arranged on the same side of the second bottom plate 63 and are parallel to each other. It is conceivable that the distance between any two adjacent second conductive teeth 64 is equal.

[0065] The first plurality of conductive teeth 62 on the first base plate 61 and the second plurality of conductive teeth 64 on the second base plate 63 are staggered, which increases the mutual inductance area between the first plurality of conductive teeth 62 and the second plurality of conductive teeth 64, and improves the control accuracy of the electronic valve.

[0066] In the present application, the second base plate 63 and the second plurality of conductive teeth 64 are conductively connected. The first base plate 61 and the first plurality of conductive teeth 62 are conductively connected. The plurality in the present application refers to two or more.

[0067] When the electric field of the first electrode and the second electrode is the same, the ion valve 60 is in an open state, and the ionized sample 30 to be detected can pass through the ion valve 60.

[0068] When the electric field of the second electrode and the first electrode is different, the ion valve 60 is in a closed state, and the ionized sample 30 to be detected cannot pass through the ion valve 60, but the solvent for dissolving the sample 30 to be detected can pass through the ion valve 60 with the carrier gas.

[0069] By using the above technical scheme, the first plurality of conductive teeth 62 is arranged on the first base plate 61, the second plurality of conductive teeth 64 is arranged on the second base plate 63, and the first plurality of conductive teeth 62 and the second plurality of conductive teeth 64 are staggered, which expands the mutual inductance area between the first plurality of conductive teeth 62 and the second plurality of conductive teeth 64, and further improves the control accuracy of the electronic valve.

[0070] In an embodiment of the present application, the planes on which the first plurality of conductive teeth 62 and the second plurality of conductive teeth 64 are located are perpendicular to the output direction of the sample ions in the ionization chamber 20.

[0071] Specifically, the planes on which the first plurality of conductive teeth 62 and the second plurality of conductive teeth 64 are located are perpendicular to the output direction of the sample ions in the ionization chamber 20, which can reduce the use of the materials of the first electrode and the second electrode, thereby reducing the production cost.

[0072] In an embodiment of the present application, the distance between any two adjacent first plurality of conductive teeth 62 and second plurality of conductive teeth 64 is defined as α, and the distance satisfies 2mm≥α≥1mm.

[0073] Specifically, the distance between any two adjacent first plurality of conductive teeth 62 and second plurality of conductive teeth 64 is between 1mm and 2mm, which can reduce the voltage value loaded on the first plurality of conductive teeth 62 and the second plurality of conductive teeth 64, thereby reducing the consumption of energy.

[0074] In one embodiment of this application, a switching element 50 is provided between the pyrolysis chamber 10 and the ionization chamber 20 to separate or connect the pyrolysis chamber 10 and the ionization chamber 20.

[0075] In one embodiment of this application, a telescopic groove is provided between the pyrolysis chamber 10 and the ionization chamber 20 to divide the connecting channel between the pyrolysis chamber 10 and the ionization chamber 20 into two ends. The switch 50 is disposed in the telescopic groove and can move telescopically within the telescopic groove to open or close the connecting channel.

[0076] Specifically, a telescopic groove is provided between the pyrolysis chamber 10 and the ionization chamber 20 to divide their connection channel into two parts. The switch 50 is located in the telescopic groove and can move telescopically within the telescopic groove to open or close the connection channel.

[0077] The above technical solution has a simple structure and is easy to implement.

[0078] In one embodiment of this application, the pyrolysis chamber 10 is provided with a heating plate 40 for heating the sample 30 to be tested, and the bottom of the heating plate 40 is provided with a water cooling component for cooling the heating plate 40.

[0079] Specifically, a heating plate 40 is installed in the pyrolysis chamber 10 to heat the sample 30 to be tested. A water cooling component is installed at the bottom of the heating plate 40. The water cooling component can quickly cool down the heating plate 40, so that the pyrolysis chamber 10 can quickly enter the next test.

[0080] In one embodiment of this application, the heating plate 40 is a graphite plate.

[0081] Specifically, the heating plate 40 is made of graphite, which allows the temperature of the heating plate to quickly reach the set conditions, so as to meet the purpose of quickly switching between different thermal desorption temperatures of samples, thereby speeding up the detection process of the instrument.

[0082] This application also discloses an analysis system, including an ion source system as described in any of the above claims and an analysis component 70 disposed at the outlet of the ion source system for analyzing the ions generated by the ion source system.

[0083] like Figure 3 As shown, when using an existing ion source device to test sample A, when the concentration of sample A reaches 20 ppb (ppb in this application is the concentration unit), the resulting sample peak height is 72 mV.

[0084] like Figure 4 As shown, when using the existing ion source device to test sample A, the characteristic peak of sample A is almost undetectable when the concentration of sample A is only 2 ppb.

[0085] As shown in Figure 5 the peak height of 26mV is obtained when the sample A is tested by the ion source system of the present application, and the test precision of low concentration sample is improved.

[0086] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure transformation, direct / indirect application in other related technical fields, or the like, which is made under the inventive concept of the present application, and based on the content of the present application and the drawings, is included in the patent protection scope of the present application.

Claims

1. An ion source system, characterized by, The ion source system comprises a pyrolysis chamber for increasing the concentration of a sample to be detected after pyrolysis, and an ionization chamber in communication with the pyrolysis chamber for ionizing the sample to be detected discharged from the pyrolysis chamber into ions to be detected and discharging the ions to be detected when the concentration of the ions to be detected meets a preset concentration. The ionization chamber is provided with an ion valve at the outlet of the ionization chamber for opening the outlet of the ionization chamber to discharge the ions to be detected when the concentration of the ions to be detected in the ionization chamber meets a preset condition. The ion valve comprises a first electrode provided at the outlet of the ionization chamber and having an electric field, and a second electrode provided opposite to the first electrode and switchable to the same or different electric field of the first electrode to release or block the ions to be detected. The first electrode comprises a first bottom plate connected to the outlet of the ionization chamber, and a plurality of first conductive teeth parallel to each other provided on the first bottom plate. The second electrode comprises a second bottom plate connected to the outlet of the ionization chamber and provided opposite to the first bottom plate, and a plurality of second conductive teeth parallel to each other provided on the second bottom plate. The first conductive teeth on the first bottom plate and the second conductive teeth on the second bottom plate are staggered and do not contact each other to release or block the ions to be detected.

2. The ion source system of claim 1, wherein, The channel between the pyrolysis chamber and the ionization chamber is provided with a switch for opening the channel to allow the sample to be detected to enter the ionization chamber when the concentration of the sample to be detected in the pyrolysis chamber meets a preset threshold after pyrolysis.

3. The ion source system of claim 1, wherein, The planes where the first conductive teeth and the second conductive teeth are located are perpendicular to the output direction of the ions to be detected in the ionization chamber.

4. The ion source system of claim 1, wherein, The distance between any two adjacent first conductive teeth and second conductive teeth is defined as α, and 2mm≥α≥1mm.

5. The ion source system of claim 2, wherein, The pyrolysis chamber and the ionization chamber are provided with an expansion groove for separating the connecting channel between the pyrolysis chamber and the ionization chamber into two ends, and the switch is provided in the expansion groove and can move in the expansion groove to open or close the connecting channel.

6. The ion source system of claim 1, wherein, The pyrolysis chamber is provided with a heating plate for heating the sample to be detected, and the bottom of the heating plate is provided with a water cooling assembly for cooling the heating plate.

7. An analytical system characterized by, The ion source system comprises a pyrolysis chamber for increasing the concentration of a sample to be detected after pyrolysis, and an ionization chamber in communication with the pyrolysis chamber for ionizing the sample to be detected discharged from the pyrolysis chamber into ions to be detected and discharging the ions to be detected when the concentration of the ions to be detected meets a preset concentration.

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