WO2023089852A1 - 誘導結合プラズマ質量分析装置 - Google Patents
誘導結合プラズマ質量分析装置 Download PDFInfo
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- 238000009616 inductively coupled plasma Methods 0.000 title claims abstract description 21
- 150000002500 ions Chemical class 0.000 claims abstract description 160
- 238000004458 analytical method Methods 0.000 claims abstract description 23
- 238000004949 mass spectrometry Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 20
- 238000000752 ionisation method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 59
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 abstract description 38
- 239000007789 gas Substances 0.000 description 119
- 239000002245 particle Substances 0.000 description 19
- 238000011045 prefiltration Methods 0.000 description 18
- 238000001514 detection method Methods 0.000 description 15
- 230000004888 barrier function Effects 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- 230000002452 interceptive effect Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 239000000112 cooling gas Substances 0.000 description 4
- 238000012850 discrimination method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005036 potential barrier Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- -1 IPC ion Chemical class 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001793 charged compounds Polymers 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/06—Electron- or ion-optical arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/105—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation, Inductively Coupled Plasma [ICP]
Definitions
- the present invention relates to an inductively coupled plasma mass spectrometer.
- ICP-MS inductively coupled plasma mass spectrometer
- ICP Inductively Coupled Plasma
- ICP-MS is known to use a collision cell to reduce the effects of interference ions caused by argon used to generate plasma in the ICP ion source and carbon generated in the plasma.
- a collision cell is provided in an intermediate vacuum chamber into which ions are introduced through a sampling cone, and He gas is introduced into the collision cell during analysis.
- interfering ions are polyatomic ions, and have a larger collision cross-section than elemental ions that have the same mass and are the object of observation. Therefore, the interference ions have more contact with the He gas than the elemental ions that are the object of observation, and their kinetic energy tends to be smaller. Therefore, interference ions can be observed by forming a potential barrier at the exit of the collision cell that allows only ions with a kinetic energy greater than or equal to a predetermined value to pass through while blocking ions with a kinetic energy less than a predetermined value. It can be removed separately from the target elemental ions.
- An ICP-MS equipped with such a collision cell is hereinafter simply referred to as an ICP-MS.
- the element to be analyzed is a light element such as lithium or beryllium
- the kinetic energy is greatly reduced by contacting He gas only a few times in the collision cell, so the detection sensitivity is greatly reduced and measurement is practically impossible.
- such light elements are hardly interfered with by interfering ions originating from argon, carbon, etc., and thus there is no need to remove interfering ions.
- the present inventor found that the detection intensity was compared for an appropriate time immediately after switching the measurement mode from the collision measurement mode to the non-collision measurement mode. It was found that a phenomenon of significant drift was observed. Due to this phenomenon, it may be difficult to accurately compare the data acquired in the collision measurement mode with the data acquired in the non-collision measurement mode. In addition, it is necessary to wait until the drift of the detection signal settles down to some extent after the measurement mode is switched, and there is also the problem that the analysis time is wasted.
- the present invention has been made to solve the above problems, and an object of the present invention is to reduce the drift of the detection signal that occurs when switching between the collision measurement mode and the non-collision measurement mode. to provide MS.
- One aspect of the ICP-MS is an ion source that ionizes a sample component by an inductively coupled plasma ionization method; a vacuum chamber into which ions generated by the ion source are introduced; a cell disposed inside the vacuum chamber for contacting ions generated by the ion source with a predetermined gas; a mass spectrometer arranged after the vacuum chamber for mass spectrometry of the ions passing through the cell or other ions derived from the ions; a first gas introduction part for introducing a predetermined gas into the cell; a second gas introduction part for introducing a predetermined gas inside the vacuum chamber and outside the cell;
- a predetermined gas is introduced by the first gas introduction unit, while when performing analysis without contacting ions with a gas in the cell, the above-mentioned a control unit for controlling gas introduction by the first and second gas introduction units so that a predetermined gas is introduced by the second gas introduction unit; Prepare.
- Predetermined gas present in the vacuum chamber can prevent the passage of unwanted ions, radicals, molecules, and other particles originating from the plasma gas and the like that are introduced into the vacuum chamber in large quantities from the ion source together with the ions originating from the sample components.
- the plasma gas and the like to the mass spectrometry unit arranged in the latter stage of the vacuum chamber Collisions of particles such as derived ions and radicals can be reduced.
- FIG. 1 is a schematic block diagram of an ICP-MS that is an embodiment of the present invention
- FIG. FIG. 4 is an explanatory diagram of the behavior of He gas in the collision measurement mode in the ICP-MS of this embodiment
- FIG. 4 is an explanatory diagram of the behavior of He gas in the non-collision measurement mode in the ICP-MS of this embodiment
- the inventors of the present invention have found through experimental studies using actual equipment and studies through simulations that the cause of the drift described above is mainly the ion optical element (specifically, the ion optical element (specifically, It was found that the surface potential state of the prefilter constituting the quadrupole mass filter).
- the term "surface potential state” as used herein refers to a change in surface potential caused by charge-up that can occur when unnecessary ions or radicals other than the target element to be measured collide with the electrode.
- the He gas supplied into the collision cell fills the interior of the collision cell and flows out of the collision cell into the outer vacuum chamber. Therefore, a relatively large amount of He gas is present in the space between the ion outlet of the collision cell and the quadrupole mass filter, and unnecessary ions and radicals emitted from the collision cell collide with this He gas, and the subsequent stage of the pretreatment difficult to reach the filter. As a result, the prefilter is less likely to be charged up.
- the charge-up phenomenon of the prefilter as described above can adequately explain the occurrence of signal drift immediately after switching from the collision measurement mode to the non-collision measurement mode. Therefore, in order to reduce this drift, even in the non-collision measurement mode, collision of unnecessary ions and radicals with the quadrupole mass filter including the pre-filter should be made as difficult as in the collision measurement mode. .
- the ICM-MS according to the present invention was made based on such findings.
- FIG. 1 is a schematic block diagram of the ICP-MS of this embodiment.
- This ICP-MS comprises an electrically grounded ionization chamber 1 which has a substantially atmospheric pressure atmosphere, a first vacuum chamber 2, a second vacuum chamber 3, and a 3 vacuum chambers 4 are provided.
- the inside of the first vacuum chamber 2 is evacuated by a rotary pump
- the insides of the second vacuum chamber 3 and the third vacuum chamber 4 are evacuated by a vacuum pump combining a rotary pump and a turbomolecular pump.
- An ICP ion source 5 is arranged inside the ionization chamber 1 .
- the ICP ion source 5 has a sample tube through which the liquid sample atomized by the nebulizing gas flows, a plasma gas tube formed around the sample tube, and a cooling gas tube formed around the plasma gas tube.
- a torch 51 is included.
- An autosampler 52 for introducing a liquid sample into the plasma torch 51 is provided at the inlet end of the sample tube of the plasma torch 51 .
- a nebulizing gas supply source that supplies nebulizing gas to the sample tube, a plasma gas supply source that supplies plasma gas such as Ar gas to the plasma gas tube, and a cooling gas supply source that supplies cooling gas to the cooling gas tube. , are connected respectively.
- the first vacuum chamber 2 is formed between a substantially conical sampling cone 6 and a substantially conical skimmer 7 . Both the sampling cone 6 and the skimmer 7 have ion passage openings at their tops.
- the first vacuum chamber 2 functions as an interface for sending ions supplied from the ICP ion source 5 to the subsequent stage and discharging solvent gas and the like.
- a drawing electrode 8 In the second vacuum chamber 3, from the skimmer 7 side, that is, from the ion incident side, there are provided: a drawing electrode 8, an ion lens 9 for converging ions, a collision cell 10, an energy barrier forming electrode 14, are placed.
- Each of the pull-in electrode 8, the plurality of electrodes forming the ion lens 9, and the plurality of electrodes forming the energy barrier forming electrode 14 is a disk-shaped electrode having a substantially circular opening for passing ions. be.
- the ion optical axis C1 extending in the Z-axis direction at the exit of the collision cell 10 and the ion optical axis C2 extending in the Z-axis direction at the entrance of the next-stage quadrupole mass filter 16 are , and an off-axis optical system that is shifted in the X-axis direction.
- the energy barrier forming electrode 14 forms an energy barrier electric field and also has a function of forming a deflection electric field for axial shift for bending the ion optical axis as shown in FIG.
- an entrance electrode 11 formed with an ion passage opening 11a is arranged, and on the exit side of the collision cell 10, an exit electrode 12 similarly formed with an ion passage opening 12a is arranged.
- a multipole (for example, octapole) type ion guide 13 including a plurality of rod electrodes arranged parallel to the Z-axis (ion optical axis C1) is arranged.
- a quadrupole mass filter 16 including a prefilter 16A and a main filter 16B, and an ion detector 17 are arranged in the third vacuum chamber 4 communicating with the second vacuum chamber 3 through an ion passage opening 15.
- the gas supply unit 22 is connected to the collision cell 10 through a first gas supply pipe 23 and communicates with the inside of the second vacuum chamber 3 (outside the collision cell 10) through a second gas supply pipe 24.
- the gas supply unit 22 can selectively supply a predetermined flow rate of collision gas to either the inside of the collision cell 10 or the outside of the collision cell 10 inside the second vacuum chamber 3 according to the control of the control unit 20.
- the collision gas is generally He gas, but other inert gas may be used.
- the collision cell can also be used as a reaction cell, in which case the gas supply section 22 supplies a reactive gas such as hydrogen or ammonia as the reaction gas.
- the voltage generation section 21 generates a predetermined voltage to be applied to each section under the control of the control section 20 .
- the control unit 20 executes analysis by comprehensively controlling each unit such as the voltage generation unit 21 and the gas supply unit 22, and also has a user interface function via an input unit 26, a display unit 27, and the like.
- the data processing unit 25 includes an analog-to-digital (AD) converter that digitizes the detection signal obtained by the ion detector 17, and processes the collected data to create a mass spectrum. is.
- AD analog-to-digital
- control unit 20 and the data processing unit 25 is a personal computer (PC) including a CPU, a RAM, an external storage device, etc.
- PC personal computer
- the configuration can be such that each function is embodied.
- FIG. 2 is an explanatory diagram of the behavior of collision gas in the collision measurement mode.
- FIG. 3 is an explanatory diagram of the behavior of collision gas in the non-collision measurement mode.
- the gas supply unit 22 continuously or intermittently supplies He gas into the collision cell 10 through the first gas supply pipe 23 under the control of the control unit 20 .
- the voltage generator 21 applies a predetermined voltage to each electrode (ion optical element) including the drawing electrode 8, the ion lens 9, the ion guide 10, and the energy barrier forming electrode 14, respectively.
- the elements contained in the liquid sample are ionized.
- Ions derived from sample components generated in the ICP ion source 5 are introduced into the second vacuum chamber 3 through ion passage ports of the sampling cone 6 and the skimmer 7 together with unwanted ions derived from plasma gas and the like. These ions are focused by an ion lens 9 and introduced into a collision cell 10 filled with collision gas.
- Unnecessary ions can be removed by such a kinetic energy discrimination method, and ions mainly derived from sample components can be passed through the ion passage opening 15 and guided to the third vacuum chamber 4 . Also, uncharged particles, such as radicals and molecules derived from plasma gas, etc., can also pass through the collision cell 10, but since these particles are not affected by the electric field, they travel straight and are eliminated by the action of the axis shift. .
- the amount of particles such as unwanted ions, radicals, or molecules derived from the plasma gas or the like (hereinafter collectively referred to as "unwanted particles”) is much greater than the amount of ions derived from sample components. many. Therefore, unnecessary particles cannot be completely removed even by the above-described kinetic energy discrimination method or axis-shifting optical system. proceed.
- the collision cell 10 since the collision cell 10 is substantially sealed, the He gas supplied into the collision cell 10 flows out of the collision cell 10 through the ion passage openings 11a and 12a as indicated by the arrows in FIG. do.
- the electrodes that make up the pre-filter 16A are made of metal such as stainless steel, but since a thin oxide film is formed on the surface of the electrodes, charging up occurs when charged particles collide.
- the pre-filter 16A is charged up, the electric field near the entrance of the quadrupole mass filter 16 is disturbed, and the trajectory of ions originating from sample components that are about to enter there becomes unstable.
- the chances of unnecessary particles colliding with the pre-filter 16A are reduced, thereby reducing the charge-up of the pre-filter 16A and allowing the ions derived from the sample components to enter the quadrupole mass filter 16. You can avoid becoming difficult to do.
- the supply of collision gas is completely stopped when executing the non-collision measurement mode in which interference ions are not removed by the kinetic energy discrimination method.
- the gas supply unit 22 supplies He gas to the second vacuum chamber 3 through the second gas supply pipe 24 according to the control of the control unit 20. continuously or intermittently.
- the amount of He gas supplied at this time is desirably set appropriately according to the internal volume of the second vacuum chamber 3, the exhaust capacity of the vacuum pump, the shape of the ion optical element arranged in the second vacuum chamber 3, and the like. can be, for example, about the same as in the collision measurement mode.
- the gas flow rate can be 3-10 sccm.
- the voltage generator 21 applies a predetermined voltage to each electrode including the drawing electrode 8, the ion lens 9, the ion guide 13, and the energy barrier forming electrode 14, exactly as in the collision measurement mode.
- ions derived from sample components are generated and introduced into the second vacuum chamber 3 through the first vacuum chamber 2 together with unwanted ions derived from plasma gas and the like. be.
- unwanted ions derived from plasma gas and the like are generated and introduced into the second vacuum chamber 3 through the first vacuum chamber 2 together with unwanted ions derived from plasma gas and the like.
- the gas existence region A is formed in the collision measurement mode, the gas existence region A is not formed in the non-collision measurement mode. charge-up was likely to occur.
- the gas existence region A is formed in both the collision measurement mode and the non-collision measurement mode, so it is possible to reduce the charge-up of the pre-filter 16A. .
- the formation of the gas-existing region A in the non-collision measurement mode may reduce the efficiency of passage of ions originating from the element to be measured (especially light elements), according to experiments by the present inventors, If the gas flow rate is as described above, it is possible to suppress the decrease in sensitivity of ions originating from the target element to several percent or less. In order to reduce the influence of this decrease in sensitivity, it is desirable to appropriately set the gas flow rate supplied into the second vacuum chamber 3 in the non-collision measurement mode.
- the IPC-MS of the above embodiment is a so-called single-type quadrupole mass spectrometer, but the configuration of the mass spectrometer can be changed as appropriate.
- the IPC-MS according to the present invention is, for example, a triple quadrupole mass spectrometer equipped with an IPC ion source, a quadrupole-time-of-flight (Q-TOF) mass spectrometer equipped with an IPC ion source, or the like. be able to.
- each component in the ICP-MS of the above embodiment can be appropriately replaced with another known component having a similar function.
- an axis-shifting optical system is used after the collision cell 10, but this is not essential.
- the kinetic energy (velocity) of particles such as ions is usually reduced in the axis-shifted optical system or the ion optical system preceding it.
- A has the advantage that it is easy to obtain the effect of blocking the passage of unnecessary particles.
- ICP-MS is an ion source that ionizes a sample component by an inductively coupled plasma ionization method; a vacuum chamber into which ions generated by the ion source are introduced; a cell disposed inside the vacuum chamber for contacting ions generated by the ion source with a predetermined gas; a mass spectrometer arranged after the vacuum chamber for mass spectrometry of ions passing through the cell or ions derived therefrom; a first gas introduction part for introducing a predetermined gas into the cell; a second gas introduction part for introducing a predetermined gas inside the vacuum chamber and outside the cell;
- a predetermined gas is introduced by the first gas introduction part, while when performing analysis without contacting ions with a gas in the cell, the above-mentioned a control unit for controlling gas introduction by the first and second gas introduction units so that a predetermined gas is introduced by the second gas introduction unit; Prepare.
- Predetermined gas present in the vacuum chamber can prevent the passage of unnecessary particles such as ions and radicals derived from argon and the like, which are introduced into the vacuum chamber in large quantities from the ion source together with the ions derived from the sample components.
- the Collisions of unnecessary particles such as ions and radicals can be reduced.
- the ICP-MS described in Section 1 may further include an off-axis ion optical system between the cell and the mass spectrometer.
- the kinetic energy of the ions is often reduced in the optical system itself or in the preceding optical system in order to favorably deflect the ions by an electrostatic field or the like. Therefore, according to the ICP-MS described in item 2, when unwanted ions derived from plasma gas or the like come into contact with a predetermined gas, the trajectory can easily be changed, and the effect of removing unwanted ions can be enhanced. .
- the mass spectrometer may be a quadrupole mass filter.
- the quadrupole mass filter In the quadrupole mass filter, if the electrodes located on the entrance side of the prefilter, etc., are charged up, the trajectory of the target ions tends to become unstable, and the detection signal tends to drift. On the other hand, according to the ICP-MS described in the third item, it is possible to reduce the charge-up of the electrodes located on the entrance side of the quadrupole mass filter, so that the effect of reducing the drift of the detection signal is achieved. You can get enough.
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Abstract
Description
以下、こうしたコリジョンセルを備えたICP-MSを単にICP-MSという。
試料成分を誘導結合プラズマイオン化法によりイオン化するイオン源と、
前記イオン源で生成されたイオンが導入される真空室と、
前記真空室の内部に配置され、前記イオン源で生成されたイオンを所定のガスに接触させるためのセルと、
前記真空室の後段に配置され、前記セルを通過したイオン又は該イオンに由来する他のイオンを質量分析する質量分析部と、
前記セルの内部に所定のガスを導入する第1ガス導入部と、
前記真空室の内部で且つ前記セルの外側に所定のガスを導入する第2ガス導入部と、
前記セル内でイオンにガスを接触させつつ分析を行う際に前記第1ガス導入部により所定のガスを導入する一方、前記セル内でイオンにガスを接触させずに分析を行う際には前記第2ガス導入部により所定のガスを導入するように、前記第1及び第2ガス導入部によるガス導入を制御する制御部と、
を備える。
まず、従来のICP-MSにおいてコリジョン測定モードと非コリジョン測定モードとを切り替える際に発生する検出信号のドリフトの状況と、推定されるドリフトの発生要因について説明する。
以下、本発明の一実施形態であるICM-MSについて、添付図面を参照して説明する。
図1は、本実施形態のICP-MSの概略ブロック構成図である。説明の便宜のために、図1中に示すように、互いに直交するX、Y、Zの3軸を空間内に定義する。
このICP-MSは、略大気圧雰囲気であって電気的に接地されたイオン化室1と、該イオン化室1側から順に真空度が高くなる第1真空室2、第2真空室3、及び第3真空室4という三つの真空室、を備える。図示しないものの、第1真空室2内はロータリーポンプにより真空排気され、第2真空室3及び第3真空室4内はロータリーポンプ及びターボ分子ポンプを組み合わせた真空ポンプによって真空排気される。
本実施形態のICP-MSにおける特徴的な分析動作を、図2及び図3を参照して説明する。このICP-MSは、制御部20による制御の下で、干渉イオンを除去するためにコリジョンセル10内でイオンとコリジョンガスを接触させるコリジョン測定モード、又はそうした干渉イオンの除去を行わない非コリジョン測定モード、を選択的に実施可能である。
図2は、コリジョン測定モードにおけるコリジョンガスの挙動の説明図である。図3は、非コリジョン測定モードにおけるコリジョンガスの挙動の説明図である。
上述した例示的な実施形態は、以下の態様の具体例であることが当業者により理解される。
試料成分を誘導結合プラズマイオン化法によりイオン化するイオン源と、
前記イオン源で生成されたイオンが導入される真空室と、
前記真空室の内部に配置され、前記イオン源で生成されたイオンを所定のガスに接触させるためのセルと、
前記真空室の後段に配置され、前記セルを通過したイオン又はそれに由来するイオンを質量分析する質量分析部と、
前記セルの内部に所定のガスを導入する第1ガス導入部と、
前記真空室の内部で且つ前記セルの外側に所定のガスを導入する第2ガス導入部と、
前記セル内でイオンにガスを接触させつつ分析を行う際に前記第1ガス導入部により所定のガスを導入する一方、前記セル内でイオンにガスを接触させずに分析を行う際には前記第2ガス導入部により所定のガスを導入するように、前記第1及び第2ガス導入部によるガス導入を制御する制御部と、
を備える。
2…第1真空室
3…第2真空室
4…第3真空室
5…ICPイオン源
51…プラズマトーチ
52…オートサンプラー
6…サンプリングコーン
7…スキマー
8…引込電極
9…イオンレンズ
10…コリジョンセル
11…入口電極
12…出口電極
11a、12a…イオン通過開口
13…イオンガイド
14…エネルギー障壁形成用電極
15…イオン通過開口
16…四重極マスフィルター
16A…プレフィルター
16B…メインフィルター
17…イオン検出器
20…制御部
21…電圧発生部
22…ガス供給部
23…第1ガス供給管
24…第2ガス供給管
25…データ処理部
26…入力部
27…表示部
Claims (4)
- 試料成分を誘導結合プラズマイオン化法によりイオン化するイオン源と、
前記イオン源で生成されたイオンが導入される真空室と、
前記真空室の内部に配置され、前記イオン源で生成されたイオンを所定のガスに接触させるためのセルと、
前記真空室の後段に配置され、前記セルを通過したイオン又は該イオンに由来する他のイオンを質量分析する質量分析部と、
前記セルの内部に所定のガスを導入する第1ガス導入部と、
前記真空室の内部で且つ前記セルの外側に所定のガスを導入する第2ガス導入部と、
前記セル内でイオンにガスを接触させつつ分析を行う際に前記第1ガス導入部により所定のガスを導入する一方、前記セル内でイオンにガスを接触させずに分析を行う際には前記第2ガス導入部により所定のガスを導入するように、前記第1及び第2ガス導入部によるガス導入を制御する制御部と、
を備える誘導結合プラズマ質量分析装置。 - さらに、前記セルと前記質量分析部との間に軸ずらしイオン光学系を備える、請求項1に記載の誘導結合プラズマ質量分析装置。
- 前記質量分析部は四重極マスフィルターである、請求項1に記載の誘導結合プラズマ質量分析装置。
- 前記質量分析部は四重極マスフィルターである、請求項2に記載の誘導結合プラズマ質量分析装置。
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JP2020091988A (ja) | 2018-12-05 | 2020-06-11 | 株式会社島津製作所 | 質量分析装置 |
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