CN102072933A - Constant volume continuous sample injector applied to ion mobility spectrometry - Google Patents

Constant volume continuous sample injector applied to ion mobility spectrometry Download PDF

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Publication number
CN102072933A
CN102072933A CN2009102200463A CN200910220046A CN102072933A CN 102072933 A CN102072933 A CN 102072933A CN 2009102200463 A CN2009102200463 A CN 2009102200463A CN 200910220046 A CN200910220046 A CN 200910220046A CN 102072933 A CN102072933 A CN 102072933A
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China
Prior art keywords
valve
sample
sampling
multiport valve
multiport
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CN2009102200463A
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Chinese (zh)
Inventor
李海洋
仓怀文
王卫国
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Dalian Institute of Chemical Physics of CAS
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Dalian Institute of Chemical Physics of CAS
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Priority to CN2009102200463A priority Critical patent/CN102072933A/en
Publication of CN102072933A publication Critical patent/CN102072933A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a sample injector of a constant volume ion mobility spectrometry. The sample injector comprises a multi-way valve, a multi-way valve control device, a sampling tube, a sample tube, a carrier gas tube and a sampling pump, wherein the sampling tube is connected with a sampling hole of the multi-way valve; and the carrier gas tube is connected with a carrier gas hole of the multi-way valve. Under the control of the multi-way valve control device, sample gas is collected by the sampling pump, is stored in the sampling tube after passing through the sampling tube and then is driven by carrier gas in the carrier gas tube to enter the ion mobility spectrometry to be analyzed to acquire a signal of a sample and an analysis result. The sample injector is used for the ion mobility spectrometry, can accurately control the sample size of the sample, effectively prevents the sample from polluting the high-sensitivity ion mobility spectrometry during on-line analysis, has high working efficiency, and contributes to the application and the popularization of an on-line ion mobility spectrometry.

Description

A kind of constant volume type continuous sample introduction device that is applied to ion mobility spectrometry
Technical field
The present invention relates to the injector of ion mobility spectrometry, specifically a kind of continuous sample introduction technology, this continuous sample introduction technology is used for ion mobility spectrometry, and the pollution that brings in the time of can effectively preventing the online sample introduction of highly sensitive ion mobility spectrometry helps the industrialization of online ionic migration spectrometer.
Background technology
Injector is one of gordian technique of ion mobility spectrometry.Ion mobility spectrometry sample injection method commonly used comprises: directly inhalation, film sample introduction, pyrolysis analyse, laser parsing etc.The sample injection method that is usually used in the real-time online detection has: direct inhalation and film sampling system.Directly inhalation is with the close sample of ion mobility spectrometry injection port, directly near the air the sample is sucked ion mobility spectrometry and analyzes.But because the influence of water in air molecule and ammonia isopolarity molecule, the reaction of ion cluster is more serious, makes the resolution of spectrogram reduce, and this method is easy to pollute migration tube when being applied to online detection.The film sample injection method that adds the last layer porous membrane between the interface of ion mobility spectrometry and atmosphere can be removed most of moisture, the amino molecule that sucks in the gas, the resolution of the formation of restriction cluster and then raising instrument, can also effectively stop other foreign-matter contaminations to enter migration tube, but the film sample introduction can desensitization and increase instrument reaction time.
Commonly used online input mode is for adopting six logical or eight logical valve injection formula sample introductions in chromatogram, so the present invention uses for reference the input mode of chromatogram, proposes a kind of sample injection method that is applied to ion mobility spectrometry, that is: constant volume type continuous sample introduction, simple in structure, easy to operate, highly sensitive.
Summary of the invention
The purpose of this invention is to provide a kind of injector of continuous sample introduction and show its application in ion mobility spectrometry, this injector has utilized six-way valve or eight logical valves to realize, use it for ion mobility spectrometry, can avoid ion mobility spectrometry to pollute, realize the real-time online sample introduction; The sensitivity that can improve ion mobility spectrometry simultaneously helps the industrialization of online ion mobility spectrometry.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of constant volume type continuous sample introduction device that is applied to ion mobility spectrometry comprises multiport valve, sampling pipe, sample hose, carrier gas pipe, sampling pump,
Described multiport valve is six-way valve, eight logical valve or ten-way valves, the connection of multipath gas can be provided, and can realize the interchannel mutual switching of multipath gas by the multiport valve control device, this mainly realize sample gas, carrier gas and the analysis sample gas that collects between mutual switching; Described sampling pipe, an end are connected on the multiport valve on the valve port a as thieff hatch, and the other end of this sampling pipe connects a sampling head; Described sampling pump, discharging opening are connected on the valve port b of multiport valve, and charging aperture links to each other with the sample gas source of the gas, so that sample gas is sent to the sample hose from the collection point; Two ends of described sample hose are connected with two valve port c, f on the multiport valve respectively, are used to store gather the sample gas that pump collects;
Described carrier gas pipe, an end are connected on the multiport valve on the valve port d as the carrier gas hole; A valve port e on the multiport valve is connected with the injection port of an ion mobility spectrometry.
Described multiport valve also can be the device of simulation six-way valve, eight logical valves or ten-way valve working method; Described multiport valve can be automatic multiport valve; Or be provided with the multiport valve control device in multiport valve, and it acts on the multiport valve, and the control multiport valve is finished the mutual change action of multiport valve gas circuit, is manual overvide or automaton.
Described multiport valve control device is a stepper motor; Described sample hose is provided with, heating arrangement, and the sample hose temperature is controlled at 20-300 ℃ during heating; Sample hose wherein is according to the required volume difference of sampling, the not isometric sample hose of employing; Described sampling pump is pneumatic pump, vacuum pump or peristaltic pump.
When described multiport valve is eight logical valves or ten-way valve, removes above connections afterwards remaining two or four valve ports and link to each other with two ends of another one or other two sample hoses respectively.
The application of described constant volume type continuous sample introduction device in ion mobility spectrometry, constant volume type continuous sample introduction and ion mobility spectrometry coupling, can realize the real-time online continuous detecting, the pollution of avoiding the ion mobility spectrometry on-line analysis to bring helps the industrialization of online ion mobility spectrometry.
By sampling device provided by the invention, can satisfy the sample introduction requirement of gas, liquid, but the step of the required sampling of sample introduction, sample introduction, analysis is finished in automation mechanized operation at short notice, satisfy ion mobility spectrometry carry out the scene, fast, the requirement that detects of real-time analysis.
Injector device provided by the invention, simple and reasonable, easy to operate, applicability is wide.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 structure of the present invention and principle of work synoptic diagram.
Embodiment
The invention provides a kind of injector of continuous sample introduction, concrete structure and principle of work are seen Fig. 1.It mainly comprises following 6 parts: multiport valve 1, sampling pipe 2, sampling pump 3, multiport valve control device 4 (being stepper motor this its), sample hose 5 and carrier gas pipe 6.
Wherein:
Multiport valve control device 4 can be stepper motor at this, and when multiport valve 1 adopted automatic multiport valve, multiport valve control device 4 can be cancelled not;
Multiport valve 1 is meant six-way valve or eight logical valves and adopts other modes to simulate the device of six-way valve or eight logical valve working methods, is example here with the six-way valve; The valve port a of multiport valve 1 goes up and connects sampling pipe 2, and the other end of this sampling pipe 2 is connected with the sampling head (not shown), and the valve port b place of multiport valve 1 connects sampling pump 3, and this sampling pump 3 can be a pneumatic pump, vacuum pump or peristaltic pump.Be connected with sample hose 5 between the valve port c of multiport valve 1 and the valve port f.Carrier gas pipe 6 is connected with the valve port e of multiport valve 1.The valve port c of multiport valve 1 can realize and the valve port b of multiport valve 1 and being communicated with respectively of valve port d for 4 times at the multiport valve control device; The valve port f of multiport valve 1 can realize and the valve port a of multiport valve 1 and being communicated with respectively of valve port e for 4 times at the multiport valve control device.Thereby realization sample hose 5 is communicated with sampling pipe 2 and carrier gas pipe 6.Multiport valve control device 4 can be manually or aut.eq., and it mainly acts on is being interconnected and switching between the valve port a-f that realizes on the multiport valve 1.
The valve port e other end on the multiport valve 1 connects an ion mobility spectrometry (not shown).
The other end connects the gas source through the clean drying after the purified treatment in the carrier gas pipe 6, no matter the gas that this gas source blows out can both pass through injector when injector sampling or sample introduction, enters ion mobility spectrometry.
When sampling, multiport valve control device 4 makes the valve port a on the multiport valve 1 be communicated with in twos mutually with valve port e with valve port c, valve port d with valve port f, valve port b, as Fig. 1 (A).Sampling pipe 2, sample hose 5 are communicated with sampling pump 3 at this moment, and carrier gas pipe 6 links to each other with ion mobility spectrometry, and carrier gas begins to purge ion mobility spectrometry in the carrier gas pipe 6, play the effect of cleaning ion mobility spectrometry.The sampling head collected specimens gas that links to each other with sampling pipe 2 makes the sample air-flow through sample hose 5 under the effect of sampling pump 3.
When sample introduction, making the valve port a on the multiport valve 1 be communicated with in twos mutually with valve port f with valve port d, valve port e under the control of multiport valve control device 4, as Fig. 1 (B) with valve port b, valve port c.Moment before sample gas enters ion mobility spectrometry, because the control of multiport valve control device 4 makes sampling pipe 2 and sample hose 5 disconnect, sample gas is stored in the sample hose 5.Carrier gas pipe 6 is connected with sample hose 5 then, and the sample gas that stores in the sample hose 5 enters the ion mobility spectrometry analysis, thereby realized the sample introduction process under the drive of carrier gas.
Just realized online, continuous sampling sample introduction with up-sampling and the operation of sample introduction process alternate cycles.The sampling of this injector suitable gas and fluid sample.But when sample is liquid, can wrap the heating arrangement (not shown) on the sample hose 5, make that heated sample makes sample vaporization when the collection liquid sample, temperature is controlled at 20-300 ℃, and this moment, sampling pump adopted peristaltic pump.
Embodiment 1:
Sampling head is positioned in the gaseous sample gas that contains acetone, and the manual injector control device makes injector be in sample states.Sampling pump 3 beginning collected specimens gas, after several seconds, the manual injector control device, make injector be in the sample introduction state, store the sample gas of a constant volume in the sample hose 5, enter in the ion mobility spectrometry under the carrier gas in carrier gas pipe 6 drives and analyze, obtain the signal and the analysis result of acetone sample.
Embodiment 2:
Sampling head is positioned in the fluid sample that contains benzene, and the automatic sampler control device makes injector be in sample states.Sampling pump 3 is a peristaltic pump, begin to gather the fluid sample of trace, through an end after the time, the automatic sampler control device, make injector be in the sample introduction state, the sample hose 5 of heating makes and enters fluid sample vaporization in the sample hose 5, enters in the ion mobility spectrometry under the carrier gas in carrier gas pipe 6 drives then and analyzes, and obtains the signal and the analysis result of benzene sample.

Claims (7)

1. constant volume type continuous sample introduction device that is applied to ion mobility spectrometry is characterized in that: comprise multiport valve (1), sampling pipe (2), sample hose (5), carrier gas pipe (6), sampling pump (3),
Described multiport valve is six-way valve, eight logical valve or ten-way valves, the connection of multipath gas can be provided, and can realize the interchannel mutual switching of multipath gas by the multiport valve control device, this mainly realize sample gas, carrier gas and the analysis sample gas that collects between mutual switching; Described sampling pipe, an end are connected on the multiport valve on the valve port a as thieff hatch, and the other end of this sampling pipe connects a sampling head;
Described sampling pump, discharging opening are connected on the valve port b of multiport valve, and charging aperture links to each other with the sample gas source of the gas, so that sample gas is sent to the sample hose from the collection point; Two ends of described sample hose are connected with two valve port c, f on the multiport valve respectively, are used to store gather the sample gas that pump collects;
Described carrier gas pipe, an end are connected on the multiport valve on the valve port d as the carrier gas hole; A valve port e on the multiport valve is connected with the injection port of an ion mobility spectrometry.
2. injector as claimed in claim 1 is characterized in that: described multiport valve is the device of simulation six-way valve, eight logical valves or ten-way valve working method.
3. injector as claimed in claim 1 is characterized in that: described multiport valve is automatic multiport valve; Or be provided with multiport valve control device (4) in multiport valve, and it acts on the multiport valve, and the control multiport valve is finished the mutual change action of multiport valve gas circuit, is manual overvide or automaton.
4. injector as claimed in claim 1 is characterized in that: described multiport valve control device is a stepper motor.
5. injector as claimed in claim 1 is characterized in that: described sample hose is provided with, heating arrangement, and the sample hose temperature is controlled at 20-300 ℃ during heating; Sample hose wherein is according to the required volume difference of sampling, the not isometric sample hose of employing.
6. injector as claimed in claim 1 is characterized in that: described sampling pump is pneumatic pump, vacuum pump or peristaltic pump.
7. injector as claimed in claim 1 is characterized in that: when described multiport valve is eight logical valves or ten-way valve, removes above connections afterwards remaining two or four valve ports and link to each other with two ends of another one or other two sample hoses respectively.
CN2009102200463A 2009-11-20 2009-11-20 Constant volume continuous sample injector applied to ion mobility spectrometry Pending CN102072933A (en)

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Application Number Priority Date Filing Date Title
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Publications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106168630A (en) * 2015-08-21 2016-11-30 福建永晶科技有限公司 A kind of sample injection method utilizing sampling device to realize high-purity sulfur hexafluoride gas
CN107796951A (en) * 2017-11-15 2018-03-13 成都理工大学 A kind of two-way automatic sampler system and its operating method
CN108088889A (en) * 2016-11-21 2018-05-29 中国科学院大连化学物理研究所 The device and method of negative ion mode ion mobility spectrometry on-line checking formaldehyde
CN109027315A (en) * 2018-09-14 2018-12-18 中国航发湖南动力机械研究所 Multiple-way valve and fuel gas analysis equipment
WO2020048178A1 (en) * 2018-09-06 2020-03-12 同方威视技术股份有限公司 Pulse sampling-based ion mobility spectrometer and sniffing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106168630A (en) * 2015-08-21 2016-11-30 福建永晶科技有限公司 A kind of sample injection method utilizing sampling device to realize high-purity sulfur hexafluoride gas
CN108088889A (en) * 2016-11-21 2018-05-29 中国科学院大连化学物理研究所 The device and method of negative ion mode ion mobility spectrometry on-line checking formaldehyde
CN107796951A (en) * 2017-11-15 2018-03-13 成都理工大学 A kind of two-way automatic sampler system and its operating method
WO2020048178A1 (en) * 2018-09-06 2020-03-12 同方威视技术股份有限公司 Pulse sampling-based ion mobility spectrometer and sniffing device
CN109027315A (en) * 2018-09-14 2018-12-18 中国航发湖南动力机械研究所 Multiple-way valve and fuel gas analysis equipment

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Application publication date: 20110525

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