CN103776893B - A kind of dielectric barrier discharge ionization source ionic migration spectrometer - Google Patents
A kind of dielectric barrier discharge ionization source ionic migration spectrometer Download PDFInfo
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- CN103776893B CN103776893B CN201410052211.XA CN201410052211A CN103776893B CN 103776893 B CN103776893 B CN 103776893B CN 201410052211 A CN201410052211 A CN 201410052211A CN 103776893 B CN103776893 B CN 103776893B
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Abstract
The present invention relates to the ionic migration spectrometer of a kind of dielectric barrier discharge ionization source, including ionization source device, sampling apparatus, drift tube, gas path circulatory system, electric-control system, signals collecting and data handling system；Described ionization source device includes cylindrical housings, radio-frequency power supply, acceleration electrode, radio-frequency electrode, quartz glass tube, working gas, circular acceleration electrode is sealingly mounted at cylindrical housings front end, two radio-frequency electrodes are enclosed within outside quartz glass tube, it is connected by wire between radio-frequency electrode with radio-frequency power supply, in quartz glass tube, imports working gas.Invention not only avoids the use of radioactive substance, and can be with direct ionization gas, liquid or solid sample.The sensitivity of Ion mobility spectrometry, stability and selectivity can be improved further simultaneously, widen the application of ion mobility spectrometry.
Description
Technical field
The invention belongs to technical field of analytical instruments, be specifically related to a kind of dielectric barrier discharge ionization source ionic migration spectrometer.
Background technology
Ion mobility spectrometry (Ion Mobility
Spectrometry, IMS) it is a kind of detection techniques of growing up of 20 century 70s, its separation principle is that the mobility by gas ion characterizes various different chemical substance, so that various materials to be analyzed detection.Ionic migration spectrometer has the advantages such as detectivity is high, measure response soon, instrument volume is little, cost is low, the detection of the volatile organic contaminant being widely used at present in gas, drugs, dangerous materials and atmospheric environment.
Conventional ion mobility spectrometer mainly includes sampling apparatus, ionization source, drift tube, automatically controlled part, gas path circulatory system, signals collecting and data handling system etc..Wherein, drift tube is mainly made up of ionic reaction district, ion gate, drift region three part.Ionization source is an important component part of ion mobility spectrometry.The most frequently used ionization source of existing ionic migration spectrometer mainly has Ni63Ionization source, corona discharge ionization source, photoionization (including VUV lamp and laser) ionization source, electron spray ionisation source etc..Based on Ni63Ionization source have that rate of ionization is high, good stability and the high advantage of detection sensitivity, but due to Ni63There is radioactivity, make the application of ionic migration spectrometer be very restricted；Corona discharge and photoionization ionization source are suitable to ionize gas phase sample, and the kind of ionized sample has certain restriction；Electron spray ionisation source is suitable to analyzing liquid sample, but sample needs through complicated pretreatment, and the apparatus structure of ionization source is the most complex, is not suitable for doing Site Detection.
Summary of the invention
The technical problem to be solved is to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of structure is reasonable, using dielectric barrier discharge as ionization source device, and the Novel ion mobility spectrometer that detection sensitivity, stability and selectivity are high.
The present invention solves above-mentioned technical problem and the technical scheme is that
A kind of dielectric barrier discharge ionization source ionic migration spectrometer, including ionization source device, sampling apparatus, drift tube, gas path circulatory system, electric-control system, signals collecting and data handling system；Described sampling apparatus is arranged in ionization source device, ionization source device and the front end compact siro spinning technology of drift tube, the rear end of drift tube connects with signals collecting and data handling system, it is characterized in that: described ionization source device includes cylindrical housings, radio-frequency power supply, acceleration electrode, radio-frequency electrode, quartz glass tube, working gas, circular acceleration electrode is sealingly mounted at cylindrical housings front end, two radio-frequency electrodes are enclosed within outside quartz glass tube, it is connected by wire between radio-frequency electrode with radio-frequency power supply, in quartz glass tube, imports working gas.
Described radio-frequency electrode is circular ring type, and the distance between two radio-frequency electrodes is 2～3cm, and the distance in a radio-frequency electrode of bottom and quartz glass tube inner end portion is less than 5mm.
Described quartz glass tube or the pipe of other insulant, its internal diameter is between 1～2mm, and wall thickness is between 0.5～2mm.
When the present invention uses, testing sample imports in ionization source device by sampling apparatus (sampling tube or sampling platform), it is ionized source ionization and generates product ion, product ion enters ionic reaction district by accelerating the booster action of electrode, under the effect of electric field, product ion enters drift tube by the ion gate periodically opened, and eventually arrives at detector and signal acquiring system under electric field and airflow field effect.Owing to quality, electrically charged, the collision cross-section of institute and the steric configuration of these product ions are different, therefore respective migration rate is different in drift tube so that different ions arrives the time difference of detector and separates.The present invention is using dielectric barrier discharge device as ionization source, and dielectric barrier discharge ionization source has the advantages such as volume is little, power consumption is few, discharge stability, can ionize gaseous sample at normal temperatures and pressures, produces a large amount of stable, energetic ion.The present invention is possible not only to avoid using radioactive ionization gauge source, and can be with direct ionization gas, liquid or solid sample.The sensitivity of Ion mobility spectrometry, stability and selectivity can be improved further simultaneously, widen the application of ion mobility spectrometry.
Accompanying drawing explanation
The present invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is a kind of structural representation of the present invention.
Fig. 2 is the another kind of structural representation of the present invention.
Label in figure is: 1. wire, 2. radio-frequency power supply, 3. quartz glass tube, 4. radio-frequency electrode, 5. cylindrical housings, 6. air vent, 7. dead ring, 8. conducting ring, 9. ion gate, 10. drift gas entrance, 11. signals collecting and data handling system, 12. accelerate electrode, 13. sampling tubes (or sampling platform), 14. ionic reaction districts, 15. drift regions, 16. drift tubes.
Detailed description of the invention
It can be seen that a kind of dielectric barrier discharge ionization source ionic migration spectrometer from Fig. 1, Fig. 2, including ionization source device, sampling apparatus, drift tube, gas path circulatory system, electric-control system, signals collecting and data handling system etc..Described drift tube 16, by the alternately arranged cavity pipe formed of several metallic conduction rings 8 and dead ring 7, mainly includes ionic reaction district 14, ion gate 9, drift region 15 3 part.Described sampling apparatus is arranged in ionization source device, and ionization source device and the front end compact siro spinning technology of drift tube, the rear end of drift tube connects with signals collecting and data handling system 11；Carrier gas and drift gas are internally formed gas path circulatory system at drift tube；Electric-control system, signals collecting and data handling system belong to the control process part of instrument, and circuit and signals collecting part to instrument are controlled respectively.The drift tube of ionic migration spectrometer involved in the present invention, carrier gas and drift gas gas path circulatory system, electric-control system, signals collecting and data handling system belong to existing mature technology, no longer describe in detail.
The invention have the characteristics that described ionization source device includes cylindrical housings 5, radio-frequency power supply 2, accelerates electrode 12, radio-frequency electrode 4, quartz glass tube 3, circular acceleration electrode 12 is sealingly mounted at cylindrical housings 5 front end, and sampling tube (or sampling platform) 13 extend in cylindrical housings 5 from sidewall；Two radio-frequency electrodes 4 are enclosed within outside quartz glass tube 3, be connected by wire 1, be imported with working gas in quartz glass tube 3 between radio-frequency electrode 4 with radio-frequency power supply 2.
Radio-frequency electrode 4 of the present invention is circular ring type, and the distance between two radio-frequency electrodes 4 is 2～3cm, and the distance in the inner end portion of a radio-frequency electrode of bottom and quartz glass tube 3 is less than 5mm.
Described quartz glass tube 3 or the pipe of ceramic material, its internal diameter is between 1～2mm, and wall thickness is between 0.5～2mm.
Dielectric barrier discharge ionization source ionic migration spectrometer shown in Fig. 1, for direct test gas sample.Sampling tube 13 is arranged on the cavity wall of cylindrical housings 5 of ionization source device, and sampling tube extend in circular cylindrical shell body from sidewall.During use, the internal working gas being passed through stable flow velocity of quartz glass tube 3, after switching on power, working gas is acted on by dielectric barrier discharge and produces stable plasma near quartz glass tube 3 inside and end, plasma produces reactant ion the most further, testing sample imports in ionization source device cylindrical housings 5 by sampling tube 13, and reactant ion reacts with testing sample generation molecular ion, produces testing sample product ion.Product ion enters ionic reaction district under accelerating electrode 12 booster action, under the effect of electric field, product ion enters drift region by the ion gate 9 periodically opened, under the uniform electric field that annular conductive ring 8 and dead ring 7 are formed, on the one hand obtain energy from electric field makees directional drift to product ion, on the other hand the neutral drift gas molecule with reverse flow constantly collides and off-energy, quality due to these product ions, institute is electrically charged, collision cross-section and steric configuration are different, therefore each migration rate is different in the electric field, the time difference of different ion arriving signal collecting parts is separated.
Dielectric barrier discharge ionization source ionic migration spectrometer shown in Fig. 2, for directly test solid or fluid sample.Sampling apparatus is designed as sample platform 13, for load bearing solid or fluid sample.During use, testing sample is inserted in ionization source device by sampling platform, it is ionized source ionization and generates product ion, product ion enters ionic reaction district by accelerating the booster action of electrode, under the effect of electric field, product ion enters drift region by the ion gate periodically opened, and eventually arrives at signals collecting and data processing section under the uniform electric field that dead ring and conducting ring are formed.Owing to quality, electrically charged, the collision cross-section of institute and the steric configuration of these product ions are different, therefore each migration rate is different in the electric field so that the time of different ion arriving signal collecting parts is different and is separated.
The present invention is using dielectric barrier discharge device as ionization source, and dielectric barrier discharge ionization source has the advantages such as volume is little, power consumption is few, discharge stability, can ionize gaseous sample at normal temperatures and pressures, produces a large amount of, stable, energetic ion.The present invention is possible not only to avoid using radioactive substance, and can be with direct ionization gas, liquid or solid sample.The sensitivity of Ion mobility spectrometry, stability and selectivity can be improved further simultaneously, widen the scope of the compound of ion migration spectrometry.
Claims (1)
1. a dielectric barrier discharge ionization source ionic migration spectrometer, including ionization source device, sampling apparatus, drift tube, gas path circulatory system, electric-control system, signals collecting and data handling system；Described sampling apparatus is arranged in ionization source device, ionization source device and the front end compact siro spinning technology of drift tube, the rear end of drift tube connects with signals collecting and data handling system, it is characterized in that: described ionization source device includes cylindrical housings, radio-frequency power supply, accelerate electrode, radio-frequency electrode, quartz glass tube, working gas, circular acceleration electrode is sealingly mounted at cylindrical housings front end, quartz glass tube is inserted radially in circular cylindrical shell body from side, two radio-frequency electrodes are enclosed within outside quartz glass tube, it is connected by wire between radio-frequency electrode with radio-frequency power supply, working gas is imported in quartz glass tube；Described radio-frequency electrode is circular ring type, and the distance between two radio-frequency electrodes is 2～3cm, and the distance in a radio-frequency electrode of bottom and quartz glass tube inner end portion is less than 5mm；Described quartz glass bore is between 1～2mm, and wall thickness is between 0.5～2mm.
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| CN103776893B true CN103776893B (en) | 2016-09-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105185686B (en) * | 2015-08-31 | 2017-05-24 | 中国科学院电子学研究所 | Ion mobility spectrometry employing electrospray/corona discharge dual-mode ion source |
| EP3631434A1 (en) * | 2017-05-24 | 2020-04-08 | B. Braun Melsungen AG | Drift tube for ion-mobility spectrometer with integrated multicapillary column |
| CN109085097B (en) * | 2018-06-07 | 2021-02-02 | 中国科学院合肥物质科学研究院 | Ultrafine particle analyzer integrating charge and classification technology |
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| CN1862760A (en) * | 2006-03-24 | 2006-11-15 | 清华大学 | Chemical ioning method based on dielectric blocking discharge and mass ion source |
| CN102522310A (en) * | 2012-01-06 | 2012-06-27 | 昆山禾信质谱技术有限公司 | Ring dielectric barrier discharge ionization device |
| CN102592916A (en) * | 2012-02-28 | 2012-07-18 | 公安部第三研究所 | Assembling method of ultraviolet lamp in ion migration spectrum device and ion migration spectrum device |
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| JP5704065B2 (en) * | 2011-12-16 | 2015-04-22 | 株式会社島津製作所 | Discharge ionization current detector |
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| CN1862760A (en) * | 2006-03-24 | 2006-11-15 | 清华大学 | Chemical ioning method based on dielectric blocking discharge and mass ion source |
| CN102522310A (en) * | 2012-01-06 | 2012-06-27 | 昆山禾信质谱技术有限公司 | Ring dielectric barrier discharge ionization device |
| CN102592916A (en) * | 2012-02-28 | 2012-07-18 | 公安部第三研究所 | Assembling method of ultraviolet lamp in ion migration spectrum device and ion migration spectrum device |
| CN103293217A (en) * | 2012-02-28 | 2013-09-11 | 株式会社岛津制作所 | Discharge ionization current detector |
| CN102636553A (en) * | 2012-03-23 | 2012-08-15 | 哈尔滨工业大学（威海） | Paper-based electrospray ion mobility spectrometry analysis method |
| CN102903599A (en) * | 2012-10-25 | 2013-01-30 | 公安部第三研究所 | Ion migration tube using surface-desorption atmospheric-pressure chemical ionization technology |
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