CN104465297A - Gas control method of parallel double-ion migration tube - Google Patents
Gas control method of parallel double-ion migration tube Download PDFInfo
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- CN104465297A CN104465297A CN201310422399.8A CN201310422399A CN104465297A CN 104465297 A CN104465297 A CN 104465297A CN 201310422399 A CN201310422399 A CN 201310422399A CN 104465297 A CN104465297 A CN 104465297A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
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Abstract
The invention relates to a gas control method of a parallel double-ion migration tube. The parallel double-ion migration tube includes a migration tube which can detect positive ions and a migration tube which can detect negative ions, wherein each migration tube needs steady drift gas flow and carrier gas flow; the carrier gas flows through a sample injector and carries sample gas in the sample injector, and the carrier gas and the sample gas respectively enter the positive ion migration tube and the negative ion migration tube simultaneously so as to be analyzed; after being combined in the ion migration tubes, the drift gas and the carrier gas are discharged from a gas discharging opening of the positive ion migration tube and a gas discharging opening of the negative ion migration tube respectively; flowmeters with regulating valves are utilized to adjust and control shift gas and discharging-gas flow and carrier gas flow of the positive ion migration tube and the negative ion migration tube in the parallel double-ion migration tube, so that the flow rate and proportion of the carrier gas that enters the positive ion migration tube and the negative ion migration tube can be indirectly adjusted and controlled; and therefore, stable drift gas and carrier gas can be provided for the positive ion migration tube and the negative ion migration tube, and simultaneous feeding and simultaneous positive and negative ion detection can be realized. The gas control method of the parallel double-ion migration tube of the invention has the advantages of simple and practical control and adjustment, low cost and wide application range.
Description
Technical field
The present invention relates to and adopt ion mobility spectrometry to carry out the technology analyzed, specifically a kind of gas control method of double ion migration tube in parallel.
Background technology
Ion mobility spectrometry work under atmospheric pressure, generally include the critical piece such as injector and transference tube, the operation of transference tube needs clean, stable drift throughput and carrier gas flux, carrier gas is flow through from injector, carried by the sample gas injector and enter transference tube analysis, after drift gas and carrier gas merge in transference tube, discharged by the exhaust outlet of transference tube.
Double ion migration tube in parallel comprises the energy migration tube of detection of positive ions and the migration tube of anion simultaneously, and each migration tube needs stable drift throughput and carrier gas flux.Wherein carrier gas is flow through from injector, is carried by the sample gas injector, is entered cation migration tube respectively by threeway and anion migration tube is analyzed simultaneously, after drift gas and carrier gas merge in transference tube, discharge respectively by the exhaust outlet of cation migration tube and the exhaust outlet of anion migration tube.
Due to the difference of itself and gas circuit assembly and connection of double ion migration tube in parallel, resistance in its cation migration tube and anion migration tube has difference, therefore the carrier gas flux of each migration tube is entered into by the distribution of threeway, meeting instability and inaccuracy, sample enters the flowmeter that cannot use again band band adjuster valve between cation migration tube and anion migration tube by threeway simultaneously, therefore, only have and adopt other method, manage the load volume regulating and controlling to enter into cation migration tube and anion migration tube, the sample size that guarantee enters into migration tube is continuous and consistent, reach the object simultaneously analyzed.
The gas control method of a kind of double ion migration tube in parallel of the present invention, exactly in order to solve the carrier gas flux size and ratio that enter into positive and negative migration tube, for each positive and negative migration tube provides stable drift gas and carrier gas, realize simultaneously sample introduction, carry out the target of negative ions detection simultaneously.
Summary of the invention
The operation of transference tube needs clean, stable drift throughput and carrier gas flux, carrier gas is flow through from injector, carried by the sample gas injector and enter transference tube analysis, after drift gas and carrier gas merge in transference tube, discharged by the exhaust outlet of transference tube.
Double ion migration tube in parallel comprises the energy migration tube of detection of positive ions and the migration tube of anion simultaneously, and each migration tube needs stable drift throughput and carrier gas flux.Wherein carrier gas is flow through from injector, is carried by the sample gas injector, is entered cation migration tube respectively and anion migration tube is analyzed simultaneously, after drift gas and carrier gas merge in transference tube, discharge respectively by the exhaust outlet of cation migration tube and the exhaust outlet of anion migration tube.
By the flowmeter of 5 band adjuster valves, regulate and control the drift gas of each positive and negative ion migration tube in double ion migration tube in parallel and discharge throughput, and carrier gas flux, come carrier gas flux size and ratio that indirect adjustments and controls enters into positive and negative migration tube, for each positive and negative migration tube provides stable drift gas and carrier gas, realize simultaneously sample introduction, carry out the target of negative ions detection simultaneously.
The gas control method of double ion migration tube in parallel of the present invention, regulate and control simple and practical, cost is low, applied widely.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further detailed explanation:
The gas control method of a kind of double ion migration tube in parallel of Fig. 1, comprise 1 air, 2 unidirectional valves, 3 air pumps, 4 drying tubes, 5 particulate filters, 6-1 is with the flowmeter of adjuster valve, for the drift gas regulating cation migration tube, 6-2 is with the flowmeter of adjuster valve, for the drift gas regulating anion migration tube, the flowmeter of 7 band adjuster valves, for regulating carrier gas, 8 cation migration tubes, 9 anion migration tubes, 10 dopant containers, 11 injectors, 12 sampling sheets, 13-1 is with the flowmeter of adjuster valve, for the discharge gas regulating cation migration tube, 13-2 is with the flowmeter of adjuster valve, for the discharge gas regulating anion migration tube.
Embodiment
Drift gas is connected by the gas access of pipeline with air pump 3 after unidirectional valve 2 with carrier gas source of the gas air 1, the gas vent of air pump 3 is respectively by the flowmeter (6-1 of pipeline through the first band adjuster valve, 6-2) be connected with the drift gas entrance of anion migration tube 9 with cation migration tube 8, simultaneously the gas vent of air pump 3 is connected with the carrier gas inlet of cation migration tube 8 with anion migration tube 9 through the flowmeter 7 of the second band adjuster valve, injector 11 respectively by pipeline;
The exhaust outlet of cation migration tube 8 and anion migration tube 9 is connected with the gas access of air pump 3 respectively by the flowmeter (13-1,13-2) of pipeline through the 3rd band adjuster valve;
Be with the flowmeter (6-1,6-2) of adjuster valve and second to be with between the flowmeter 7 of adjuster valve in the gas vent and first of air pump 3 and be provided with drying tube 4, particulate filter 5 successively;
Pipeline between the flowmeter 7 and injector 11 of the second band adjuster valve is provided with dopant container 10; Sample introduction spigot in injector 11 is provided with sampling sheet 12.
Its flow rate adjusting method is, first flowmeter (the 13-1 of two the 3rd band adjuster valves is opened completely, 13-2), namely the discharge gas of cation migration tube and the discharge gas of anion migration tube is opened completely, then flowmeter (the 6-1 of two first band adjuster valves is regulated respectively, 6-2) make the drift throughput of cation migration tube, the drift throughput of anion migration tube is predetermined value, regulate the flowmeter 7 of the second band adjuster valve, make carrier gas flux be predetermined value; Turn the 3rd flowmeter 13-1 being with adjuster valve be connected with the discharge gas port of cation migration tube more respectively down, make gas outlet flow for its drift throughput and required carrier gas flux sum; Turn the 3rd flowmeter 13-2 being with adjuster valve be connected with the discharge gas port of anion migration tube down, make gas outlet flow for its drift throughput and required carrier gas flux sum; Carrier gas is shunted according to a certain percentage, enter into cation migration tube and anion migration tube respectively.
When analyzing, the sampling sheet 12 being loaded with sample inserts in injector 11, and the sample gas through the heat vaporized formation of injector 11 is taken out of by the carrier gas flowed through, and is sent to cation migration tube 8 and anion migration tube 9 is analyzed.
Embodiment 1
Open the flowmeter (13-1 of two the 3rd band adjuster valves completely, 13-2), namely the discharge gas of cation migration tube and the discharge gas of anion migration tube is opened completely, then flowmeter (the 6-1 of two first band adjuster valves is regulated respectively, 6-2) make the drift throughput of cation migration tube, the drift throughput of anion migration tube is 600ml/min, regulate the flowmeter 7 of the second band adjuster valve, make carrier gas flux be 400ml/min; Turn the 3rd flowmeter 13-1 being with adjuster valve be connected with the discharge gas port of cation migration tube more respectively down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 960ml/min; Turn the 3rd flowmeter 13-2 being with adjuster valve be connected with the discharge gas port of anion migration tube down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 640ml/min; Carrier gas is shunted according to a certain percentage, enter into cation migration tube and anion migration tube respectively, and the split ratio of carrier gas is 1:9.
When analyzing, the sampling sheet 12 being loaded with 1 milligram of Propofol sample inserts in injector 11, and the sample gas through the heat vaporized formation of injector 11 is taken out of by the carrier gas flowed through, and is sent to cation migration tube 8 and anion migration tube 9 is analyzed.Result cation migration tube 8 obtains the signal of very high Propofol sample, and anion migration tube 9 obtains the signal of lower Propofol sample.
Embodiment 2
Open the flowmeter (13-1 of two the 3rd band adjuster valves completely, 13-2), namely the discharge gas of cation migration tube and the discharge gas of anion migration tube is opened completely, then flowmeter (the 6-1 of two first band adjuster valves is regulated respectively, 6-2) make the drift throughput of cation migration tube, the drift throughput of anion migration tube is 800ml/min, regulate the flowmeter 7 of the second band adjuster valve, make carrier gas flux be 400ml/min; Turn the 3rd flowmeter 13-1 being with adjuster valve be connected with the discharge gas port of cation migration tube more respectively down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 840ml/min; Turn the 3rd flowmeter 13-2 being with adjuster valve be connected with the discharge gas port of anion migration tube down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 1160ml/min; Carrier gas is shunted according to a certain percentage, enter into cation migration tube and anion migration tube respectively, and the split ratio of carrier gas is 9:1.
When analyzing, the sampling sheet 12 being loaded with 1 milligram of agricultural chemicals carbofuran sample inserts in injector 11, and the sample gas through the heat vaporized formation of injector 11 is taken out of by the carrier gas flowed through, and is sent to cation migration tube 8 and anion migration tube 9 is analyzed.Result cation migration tube 8 obtains the signal of lower agricultural chemicals carbofuran sample, and anion migration tube 9 obtains the signal of higher agricultural chemicals carbofuran sample.
Embodiment 3
Open the flowmeter (13-1 of two the 3rd band adjuster valves completely, 13-2), namely the discharge gas of cation migration tube and the discharge gas of anion migration tube is opened completely, then flowmeter (the 6-1 of two first band adjuster valves is regulated respectively, 6-2) make the drift throughput of cation migration tube, the drift throughput of anion migration tube is 600ml/min, regulate the flowmeter 7 of the second band adjuster valve, make carrier gas flux be 400ml/min; Turn the 3rd flowmeter 13-1 being with adjuster valve be connected with the discharge gas port of cation migration tube more respectively down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 760ml/min; Turn the 3rd flowmeter 13-2 being with adjuster valve be connected with the discharge gas port of anion migration tube down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 840ml/min; Carrier gas is shunted according to a certain percentage, enter into cation migration tube and anion migration tube respectively, and the split ratio of carrier gas is 4:6.
When analyzing, the sampling sheet 12 being loaded with 1 microgram agricultural chemicals chlopyrifos sample inserts in injector 11, and the sample gas through the heat vaporized formation of injector 11 is taken out of by the carrier gas flowed through, and is sent to cation migration tube 8 and anion migration tube 9 is analyzed.Result cation migration tube 8 obtains the signal of lower agricultural chemicals chlopyrifos sample, and anion migration tube 9 obtains the signal of higher agricultural chemicals chlopyrifos sample.
Embodiment 4
Open the flowmeter (13-1 of two the 3rd band adjuster valves completely, 13-2), namely the discharge gas of cation migration tube and the discharge gas of anion migration tube is opened completely, then flowmeter (the 6-1 of two first band adjuster valves is regulated respectively, 6-2) make the drift throughput of cation migration tube, the drift throughput of anion migration tube is 800ml/min, regulate the flowmeter 7 of the second band adjuster valve, make carrier gas flux be 400ml/min; Turn the 3rd flowmeter 13-1 being with adjuster valve be connected with the discharge gas port of cation migration tube more respectively down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 1040ml/min; Turn the 3rd flowmeter 13-2 being with adjuster valve be connected with the discharge gas port of anion migration tube down, make gas outlet flow for its drift throughput and required carrier gas flux sum, i.e. 960ml/min; Carrier gas is shunted according to a certain percentage, enter into cation migration tube and anion migration tube respectively, and the split ratio of carrier gas is 6:4.
When analyzing, the sampling sheet 12 being loaded with 1 milligram of agricultural chemicals chlopyrifos sample inserts in injector 11, and the sample gas through the heat vaporized formation of injector 11 is taken out of by the carrier gas flowed through, and is sent to cation migration tube 8 and anion migration tube 9 is analyzed.The signal of the agricultural chemicals chlopyrifos sample that result cation migration tube 8 is higher, anion migration tube 9 obtains the signal of lower agricultural chemicals chlopyrifos sample.
Claims (8)
1. a gas control method for double ion migration tube in parallel,
Double ion migration tube in parallel comprises the migration tube of the detection of positive ions simultaneously carrying out detecting and the migration tube of a detection anion, and each migration tube needs to stablize controlled drift throughput and carrier gas flux;
Wherein carrier gas is flow through from injector, is carried by the sample gas injector, is entered cation migration tube respectively and anion migration tube is analyzed simultaneously;
After drift gas and carrier gas merge in transference tube, discharge respectively by the exhaust outlet of cation migration tube and the exhaust outlet of anion migration tube;
The structure of described double ion migration tube in parallel is: drift gas is connected by the gas access of pipeline with air pump (3) after unidirectional valve (2) with carrier gas source of the gas (1), the gas vent of air pump (3) is respectively by the flowmeter (6-1 of pipeline through the first band adjuster valve, 6-2) be connected with the drift gas entrance of anion migration tube (9) with cation migration tube (8), the gas vent of air pump (3) is by the flowmeter (7) of pipeline through the second band adjuster valve simultaneously, injector (11) is connected with the carrier gas inlet of cation migration tube (8) with anion migration tube (9) respectively,
The exhaust outlet of cation migration tube (8) and anion migration tube (9) is connected with the gas access of air pump (3) respectively by the flowmeter (13-1,13-2) of pipeline through the 3rd band adjuster valve;
By regulating two the first flowmeter (6-1 being with adjuster valve, 6-2), the flowmeter (13-1 of two the 3rd band adjuster valves, 13-2) regulate and control the drift gas of each positive and negative ion migration tube in double ion migration tube in parallel and discharge throughput, come carrier gas flux size and ratio that indirect adjustments and controls enters into positive and negative migration tube, for each positive and negative migration tube provides stable drift gas and carrier gas, realize simultaneously sample introduction, carry out the target of negative ions detection simultaneously.
2. gas control method as claimed in claim 1, is characterized in that: the drift gas entrance of cation migration tube (8) and row's exhaust outlets, respectively connected the flowmeter of band adjuster valve, for adjustment drift gas and the flow of discharging gas;
The drift gas entrance of anion migration tube (9) and row's exhaust outlets, respectively connected the flowmeter of band adjuster valve, for regulating the flow floating gas and discharge gas.
3. gas control method as claimed in claim 1, is characterized in that: double ion migration tube in parallel shares a carrier gas gas circuit; The flowmeter (7) of a band adjuster valve is connected with carrier gas, for the flow regulating carrier gas; Carrier gas is flow through from injector, carried by the sample gas injector, enter cation migration tube respectively by threeway and anion migration tube is analyzed simultaneously.
4. gas control method as claimed in claim 1, it is characterized in that: its flow rate adjusting method is, first flowmeter (the 13-1 of two the 3rd band adjuster valves is opened completely, 13-2), namely the discharge gas of cation migration tube and the discharge gas of anion migration tube is opened completely, then flowmeter (the 6-1 of two first band adjuster valves is regulated respectively, 6-2) make the drift throughput of cation migration tube, the drift throughput of anion migration tube is predetermined value, regulate the flowmeter (7) of the second band adjuster valve, make carrier gas flux be predetermined value; Turn the 3rd flowmeter (13-1) being with adjuster valve be connected with the discharge gas port of cation migration tube more respectively down, make gas outlet flow for its drift throughput and required carrier gas flux sum; Turn the 3rd flowmeter (13-2) being with adjuster valve be connected with the discharge gas port of anion migration tube down, make gas outlet flow for its drift throughput and required carrier gas flux sum; Carrier gas is shunted according to a certain percentage, enter into cation migration tube and anion migration tube respectively.
5. gas control method as claimed in claim 4, is characterized in that: the carrier gas shunt ratio entering into cation migration tube and anion migration tube is between 1:9 to 9:1.
6. gas control method as claimed in claim 4, it is characterized in that: the carrier gas shunt ratio entering into cation migration tube and anion migration tube, optimum is between 4:6 to 6:4.
7. gas control method as claimed in claim 4, it is characterized in that: be with the flowmeter (6-1,6-2) of adjuster valve and second to be with between the flowmeter of adjuster valve (7) in the gas vent and first of air pump (3) and be provided with drying tube (4), particulate filter (5) successively.
Pipeline between the flowmeter (7) and injector (11) of the second band adjuster valve is provided with dopant container (10); Sample introduction spigot in injector (11) is provided with sampling sheet (12).
8. gas control method as claimed in claim 1, is characterized in that: described cation migration tube is identical with the structure of anion migration tube.
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| CN201310422399.8A CN104465297B (en) | 2013-09-16 | 2013-09-16 | Gas control method of parallel double-ion migration tube |
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| CN112908827A (en) * | 2019-11-19 | 2021-06-04 | 中国科学院大连化学物理研究所 | Ion mobility spectrometry appearance control gas circuit |
| CN112908827B (en) * | 2019-11-19 | 2021-11-09 | 中国科学院大连化学物理研究所 | Ion mobility spectrometry appearance control gas circuit |
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