CN102445508A - Helium ion gas chromatograph and use method thereof - Google Patents
Helium ion gas chromatograph and use method thereof Download PDFInfo
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- CN102445508A CN102445508A CN2011102988093A CN201110298809A CN102445508A CN 102445508 A CN102445508 A CN 102445508A CN 2011102988093 A CN2011102988093 A CN 2011102988093A CN 201110298809 A CN201110298809 A CN 201110298809A CN 102445508 A CN102445508 A CN 102445508A
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- 239000007789 gas Substances 0.000 title claims abstract description 84
- 239000001307 helium Substances 0.000 title claims abstract description 68
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000012159 carrier gas Substances 0.000 claims abstract description 86
- -1 helium ion Chemical class 0.000 claims abstract description 36
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002808 molecular sieve Substances 0.000 claims abstract description 27
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010926 purge Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 28
- 238000004587 chromatography analysis Methods 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000746 purification Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002161 passivation Methods 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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Abstract
The present invention discloses a helium ion gas chromatograph and a use method thereof. The helium ion gas chromatograph comprises a carrier gas source, a zero dead volume pressure stabilizing valve, a helium purification device, a zero dead volume four-way junction, a purging system inlet, a purging system outlet, a 5A molecular sieve chromatographic column, a detector, a back pressure valve and a sample device. The carrier gas source, the zero dead volume pressure stabilizing valve, the helium purification device and the zero dead volume four-way junction are sequentially communicated. The zero dead volume four-way junction is respectively communicated with the purging system inlet, the detector and the sample device. The purging system inlet and the purging system outlet are arranged on the sample device. The sample device, the 5A molecular sieve chromatographic column, the detector and the back pressure valve are sequentially communicated. With the present invention, the interference of the background impurities in the carrier gas is eliminated, the interference to the system due to the air is eliminated, the detection limit of the sample is improved, the separation effect of the chromatographic column is improved, and the accuracy and the stability of the experimental results are improved.
Description
Technical field
The present invention relates to a kind of gas chromatograph, particularly a kind of helium ion gas chromatograph and method of application thereof.
Background technology
Gas chromatograph is that biased sample is carried out the device that compartment analysis detects, and comprises air-channel system, sampling system, piece-rate system, circuit control system, detection system, data acquisition and disposal system.The sample that carrier gas carries the desire separation in gas chromatograph is through the stationary phase in the chromatographic column; Make each component separation in the sample; Detect through detecting device respectively then, collect the peak height or the area of each component in the sample, need components contents through calculating through data acquisition system (DAS).Helium ionization detector (HID) is a universal high sensitivity detector, all materials is all just had respond.
Traditional helium ion gas chromatograph can obtain each components contents of needs through six-way valve or ten-way valve through different chromatographic column sample introductions when carrying out trace detection; The problem of this method is that the background impurity in the carrier gas can reduce the sensitivity of detecting device; Airborne oxygen nitrogen system pressure low the time be easier to penetrate into and influence detecting device; The appearance Interference Peaks can be to the cutting of peak shape and is finally quantitatively produced very mistake, reduces the experimental result accuracy.
The present invention has overcome in the prior art error effect that oxygen nitrogen brings test in the impurity and air in the carrier gas; A kind of gas chromatograph that can improve the helium ionization detector detectability has been proposed; Single injected sampling is accomplished the separation of sample component with quantitative, can either improve the detectability of sample, and the post that can improve chromatographic column is again imitated; And reduce the error that experiment produces, improve the accuracy and the reliability of experimental result.
Summary of the invention
The invention provides a kind of helium ion gas chromatograph; It is characterized in that, comprise carrier gas source of the gas, zero dead volume pressure maintaining valve, helium purifier, zero dead volume four-way, purging system inlet, purging system outlet, 5A molecular sieve chromatography post, detecting device, counterbalance valve, sampling device; Said carrier gas source of the gas, said zero dead volume pressure maintaining valve, said helium purifier, said zero dead volume four-way are communicated with successively; Said zero dead volume four-way is communicated with said purging system inlet, said detecting device, said sampling device respectively; Said purging system inlet is arranged on the said sampling device with said purging system outlet; Said sampling device, said 5A molecular sieve chromatography post, said detecting device, said counterbalance valve are communicated with successively.
Wherein, said sampling device comprises quantifying ring, sample input end, sample emptying end, six-way valve.Quantifying ring, sample input end, sample emptying end are communicated with six-way valve respectively.
Wherein, said six-way valve comprises carrier gas inlet, carrier gas outlet, sample inlet, sample export, quantifying ring inlet, quantifying ring outlet.The two ends of quantifying ring are communicated with quantifying ring inlet, quantifying ring outlet respectively; The sample input end is communicated with sample inlet; Sample emptying end is communicated with sample export; Carrier gas inlet is communicated with zero dead volume four-way; The carrier gas outlet is communicated with 5A molecular sieve chromatography post.
Wherein, under sample, said zero dead volume four-way is through carrier gas inlet, the carrier gas outlet connection of connecting with 5A molecular sieve chromatography post; The sample input end is through the connection of connecting with quantifying ring of sample inlet, quantifying ring inlet; Quantifying ring is through quantifying ring outlet, the sample export connection of connecting with sample emptying end.
Wherein, under the sample introduction state, said zero dead volume four-way is through the connection of connecting with quantifying ring of carrier gas inlet, quantifying ring inlet; Quantifying ring is through quantifying ring outlet, the carrier gas outlet connection of connecting with 5A molecular sieve chromatography post; The sample input end is through the connection of connecting with sample emptying end of sample inlet, sample export.
Wherein, the carrier gas that said carrier gas source of the gas provides obtains the high-purity helium through zero dead volume pressure maintaining valve behind helium purifier purifying, exports said zero dead volume four-way to.In said carrier gas high-purity helium, its impurities concentration is that impurity comprises H below the 10PPb
2, O
2, N
2, CH
4, CO, CO
2, H
2O.
Wherein, said detecting device is a helium ionization detector.
Wherein, further comprise the gas pipeline that is communicated with usefulness.
The present invention also provides a kind of method of application of helium ion gas chromatograph, it is characterized in that, may further comprise the steps:
Step 1: said six-way valve is arranged on sample; Carrier gas is successively through said carrier gas source of the gas, zero dead volume pressure maintaining valve, helium purifier, zero dead volume four-way, six-way valve, 5A molecular sieve chromatography post, detecting device, counterbalance valve, with residual gas emptying in the said helium ion gas chromatograph; Sample gas is accomplished the sampling to testing sample successively through said sampling device sample input end, six-way valve, quantifying ring, sample emptying end;
Step 2: said six-way valve is arranged on the sample introduction state, and carrier gas is successively through said carrier gas source of the gas, zero dead volume pressure maintaining valve, helium purifier, zero dead volume four-way, six-way valve, quantifying ring, 5A molecular sieve chromatography post, detecting device, counterbalance valve; In said detecting device, testing sample is detected.
Repeating said steps one, step 2 are taken a sample repeatedly, sample introduction and detection.
A kind of helium ion gas chromatograph provided by the invention and method of application thereof, its sample introduction process is moved automatically, and experimental implementation is simple and practical.Helium treater wherein can be removed the carrier gas background impurity, reduces the baseline noise of helium ionization detector, improves the detectability of helium ionization detector.The six-way valve that band purges can eliminate air and valve switches the adverse effect of bringing impurity, and it is little, highly sensitive to detect error, and accuracy is high, good stability.Pressurized operation can improve the separation efficiency of chromatographic column before and after the chromatographic column, can eliminate the adverse effect that air brings system.The pressure and the flow of counterbalance valve control total system.The present invention's practicality simple to operate, experimental error is little, and accuracy is high.
The present invention can reduce the influence of the pressure surge of valve switching to detecting device; Can reduce the interference of air to system, reduce the noise of detecting device, the control of system outlet back pressure can improve the detectability of helium ion detector; The post that can improve chromatographic column is imitated, and improves separating power.Autovalve sample introduction and the repeatability that purges the system that guaranteed have reduced personal error, have improved the collimation and the accuracy of this helium ion gas chromatograph experimental result.
The beneficial effect of helium ion gas chromatograph of the present invention; Eliminated the interference of background impurity in the carrier gas, eliminated the interference of air, improved the detectability of various samples system; Improve the separating effect of chromatographic column, improved the accuracy and the stability of experimental result.
Description of drawings
Fig. 1 is the structural representation of helium ion gas chromatograph of the present invention in sample.
Fig. 2 is the structural representation of helium ion gas chromatograph of the present invention at the sample introduction state.
Fig. 3 is a helium ion gas chromatograph of the present invention at 0psi back pressure carrier gas test result synoptic diagram under the purification condition not.
Fig. 4 is helium ion gas chromatograph of the present invention test result synoptic diagram under 0psi back pressure carrier gas purification condition.
Fig. 5 is helium ion gas chromatograph of the present invention test result synoptic diagram under 40psi back pressure carrier gas purification condition.
The practical implementation method
Do further detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention, but should not limit protection scope of the present invention with this.
The outlet of 1-quantifying ring, 2-carrier gas outlet, 3-carrier gas outlet, 4-quantifying ring inlet, 5-sample inlet; The 6-sample export, 7-carrier gas source of the gas, 8-zero dead volume pressure maintaining valve, 9-helium purifier, 10-zero dead volume four-way; 11-purging system inlet, 12-quantifying ring, 13-sample input end, the outlet of 14-purging system, 15-sample emptying end; 16-5A molecular sieve chromatography post, 17-detecting device, 18-counterbalance valve, 19-six-way valve.
Like Fig. 1, helium ion gas chromatograph of the present invention shown in Figure 2, comprise carrier gas source of the gas 7, zero dead volume pressure maintaining valve 8, helium purifier 9; Zero dead volume four-way 10, purging system inlet 11, purging system outlet 14,5A molecular sieve chromatography post 16; Detecting device 17, counterbalance valve 18, sampling device.Wherein, carrier gas source of the gas 7, zero dead volume pressure maintaining valve 8, helium purifier 9, zero dead volume four-way 10 are communicated with successively.Zero dead volume four-way 10 is communicated with purging system inlet 11, detecting device 17, sampling device respectively.Purging system inlet 11 is arranged on the sampling device with purging system outlet 14.Sampling device, 5A molecular sieve chromatography post 16, detecting device 17, counterbalance valve 18 are communicated with successively.
Be connected through gas pipeline between each building block of helium ion gas chromatograph of the present invention.Gas pipeline is preferably 1/16 passivation stainless steel pipes, and the front and back end of gas pipeline has pressure and exists.
Wherein, the carrier gas of carrier gas source of the gas 7 output is by zero dead volume pressure maintaining valve 8 and the control of vapour lock pipeline.The carrier gas that carrier gas source of the gas 7 provides is the high-purity helium through zero dead volume pressure maintaining valve 8 behind helium purifier 9 purifying, the impurity concentration that exports the carrier gas of zero dead volume four-way 10 to is below the 10PPb, and impurity can be H
2, O
2, N
2, CH
4, CO, CO
2, H
2O.Purging system inlet 11 has carrier gas to be blown into all the time, carrier gas is flowed out from purging system outlet 14, has eliminated the adverse effect of bringing impurity when air switches for six-way valve 19 and valve.
Wherein, sampling device comprises quantifying ring 12, sample input end 13, sample emptying end 15, six-way valve 19.Six-way valve 19 comprises carrier gas inlet 3, carrier gas outlet 2, sample inlet 5, sample export 6, quantifying ring inlet 4, quantifying ring outlet 1.The two ends of quantifying ring 12 are communicated with quantifying ring inlet 4, quantifying ring outlet 1 respectively; Sample input end 13 is communicated with sample inlet 5; Sample emptying end 15 is communicated with sample export 6; Carrier gas inlet 3 is communicated with zero dead volume four-way 10; Carrier gas outlet 2 is communicated with 5A molecular sieve chromatography post 16.
The different user mode of helium ion gas chromatograph according to the present invention, the gas circuit structure of six-way valve 19 and pass-through mode have two kinds of different situations.As shown in Figure 1, the mode of communicating when sample is: zero dead volume four-way 10 is through carrier gas inlet 3, carrier gas outlet 2 connection of connect with 5A molecular sieve chromatography post 16, and sample input end 13 passes through 4 connections of connecting with quantifying ring 12 that enter the mouth of sample inlet 5, quantifying ring; Quantifying ring 12 is through the connection of connecting with sample emptying end 15 of quantifying ring outlet 1, sample export 6.When sample, carrier gas is passed through carrier gas inlet 3, carrier gas outlet 2,5A molecular sieve chromatography post 16, detecting device 17, counterbalance valve 18 successively with the gas emptying in the gas pipeline.Sample gas is successively through sample input end 13, sample inlet 5, quantifying ring inlet 4, quantifying ring 12, quantifying ring outlet 1, sample export 6, sample emptying end 15; At this moment; Storing testing sample gas in the quantifying ring 12, simultaneously, the residual gas in the gas pipeline is by emptying.
As shown in Figure 2, the mode of communicating when the sample introduction state is: zero dead volume four-way 10 is through carrier gas inlet 3, quantifying ring inlet 4 connection of connecting with quantifying ring 12; Quantifying ring 12 is through quantifying ring outlet 1, carrier gas outlet 2 connection of connecting with 5A molecular sieve chromatography post 16; Sample input end 13 is through the connection of connecting with sample emptying end 15 of sample inlet 5, sample export 6.When the sample introduction state, carrier gas gets into quantifying ring 12 through carrier gas inlet 3, quantifying ring inlet 4; The testing sample gas that has been stored in the quantifying ring 12 is promoted by carrier gas, and the quantifying ring of flowing through successively outlet 1, carrier gas outlet 2 behind 5A molecular sieve chromatography post 16, detect in detecting device 17; At last through counterbalance valve 18 emptying.Simultaneously, sample gas through sample input end 13, sample inlet 5, sample export 6, returns through sample emptying end 15 successively again, and the sample gas of this moment no longer gets into whole measuring system.
In the present embodiment; Earlier six-way valve 19 is arranged on the sampling duty; Carrier gas is successively through said carrier gas source of the gas 7, zero dead volume pressure maintaining valve 8, helium purifier 9, zero dead volume four-way 10, six-way valve 19,5A molecular sieve chromatography post 16, detecting device 17, counterbalance valve 18, with residual gas emptying in the said helium ion gas chromatograph; Sample gas is accomplished the sampling to testing sample gas successively through said sampling device sample input end 13, six-way valve 19, quantifying ring 12, sample emptying end 15.As shown in Figure 1, sample gas and carrier gas get into that helium ion gas chromatograph is taken a sample and the emptying of residual gas.When residual gas emptying is clean, accomplish sampling to testing sample.Then, six-way valve 19 is arranged on the sample introduction state, carrier gas is successively through carrier gas source of the gas 7, zero dead volume pressure maintaining valve 8, helium purifier 9, zero dead volume four-way 10, six-way valve 19, quantifying ring 12,5A molecular sieve chromatography post 16, detecting device 17, counterbalance valve 18; In said detecting device 17, testing sample is detected.Promptly; The spool of control six-way valve 19 switches to the sample introduction state like Fig. 2 with it; The carrier gas band the testing sample gas that is stored in the quantifying ring 12 and from quantifying ring 12 entering 5A molecular sieve chromatography posts 16, is separated; After detecting device 17 detects,, realize detection to testing sample through counterbalance valve 18 emptying.The sampling duty of repeating step one, the sample introduction duty of step 2, sampling repeatedly, sample introduction and detection.Can continue to switch to sample as shown in Figure 1 by computer control six-way valve spool, switch to sample introduction state again, realize sampling repeatedly and detection repeatedly like Fig. 2.
Below be the data that collect table one, table two, table three through chromatographic work station, the chromatographic peak and the content of difference corresponding diagram 3, Fig. 4, Fig. 5 and each component.Wherein, table one is not each component chromatographic peak area under the purifying situation of prior art 0psi back pressure carrier gas.Table two is each component chromatographic peak area under the situation behind the 0psi back pressure carrier gas purifying.Table three is each the component chromatographic peak area under the situation behind the 40psi back pressure carrier gas purifying of the present invention.
Through the data in contrast table one, table two and the table three; Can find each the component chromatogram peak area ratio 0psi back pressure carrier gas behind the 40psi back pressure carrier gas purifying not each the component chromatographic peak area behind purifying, the 0psi back pressure carrier gas purifying want big; It wherein is example with hydrogen; Hydrogen is not 5.14 times of purifying of 0psi back pressure carrier gas behind 40psi back pressure carrier gas purifying, is 4.33 times behind the 0psi back pressure carrier gas purifying.Helium ionization detector is a common detector, and all materials are all had response, can know according to experimental result, and helium ion gas chromatograph of the present invention can effectively improve the response to various materials.
Therefore; According to relative standard deviation 3% with interior national standard; The testing result of this practicality helium ion gas chromatograph has good collimation; Rely on the response bigger about 5 times than other helium ionization detectors simultaneously, its detectability can also guarantee result's accuracy far below the detectability of the helium ion gas chromatograph of the same industry, improves the separating effect of chromatographic column.
The above is merely preferred embodiment of the present invention, is not to be used for limiting practical range of the present invention.Have common knowledge the knowledgeable in the technical field under any, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching, protection domain of the present invention should be as the criterion with the protection domain that claims were defined.
Claims (10)
1. helium ion gas chromatograph; It is characterized in that, comprise carrier gas source of the gas (7), zero dead volume pressure maintaining valve (8), helium purifier (9), zero dead volume four-way (10), purging system inlet (11), purging system outlet (14), 5A molecular sieve chromatography post (16), detecting device (17), counterbalance valve (18), sampling device; Said carrier gas source of the gas (7), said zero dead volume pressure maintaining valve (8), said helium purifier (9), said zero dead volume four-way (10) are communicated with successively; Said zero dead volume four-way (10) is communicated with said purging system inlet (11), said detecting device (17), said sampling device respectively; Said purging system inlet (11) is arranged on the said sampling device with said purging system outlet (14); Said sampling device, said 5A molecular sieve chromatography post (16), said detecting device (17), said counterbalance valve (18) are communicated with successively.
2. helium ion gas chromatograph according to claim 1 is characterized in that said sampling device comprises quantifying ring (12), sample input end (13), sample emptying end (15), six-way valve (19); Said quantifying ring (12), said sample input end (13), said sample emptying end (15) are communicated with said six-way valve (19) respectively.
3. like the said helium ion of claim 2 gas chromatograph, it is characterized in that said six-way valve (19) comprises carrier gas inlet (3), carrier gas outlet (2), sample inlet (5), sample export (6), quantifying ring inlet (4), quantifying ring outlet (1); The two ends of said quantifying ring (12) are communicated with said quantifying ring inlet (4), said quantifying ring outlet (1) respectively; Said sample input end (13) is communicated with said sample inlet (5); Said sample emptying end (15) is communicated with said sample export (6); Said carrier gas inlet (3) is communicated with said zero dead volume four-way (10); Said carrier gas outlet (2) is communicated with said 5A molecular sieve chromatography post (16).
4. according to the said helium ion of claim 3 gas chromatograph; It is characterized in that; Under sample; Said zero dead volume four-way (10) exports (2) connection of connecting with said 5A molecular sieve chromatography post (16) through said carrier gas inlet (3), said carrier gas; Said sample input end (13) is through said sample inlet (5), said quantifying ring inlet (4) connection of connecting with said quantifying ring (12), and said quantifying ring (12) exports the connection of connecting with said sample emptying end (15) of (1), said sample export (6) through said quantifying ring.
5. according to the said helium ion of claim 3 gas chromatograph, it is characterized in that under the sample introduction state, said zero dead volume four-way (10) is through (4) connection of connecting with said quantifying ring (12) that enters the mouth of said carrier gas inlet (3), said quantifying ring; Said quantifying ring (12) exports (1), said carrier gas outlet (2) connection of connecting with said 5A molecular sieve chromatography post (16) through said quantifying ring; Said sample input end (13) is through the connection of connecting with said sample emptying end (15) of said sample inlet (5), said sample export (6).
6. according to the said helium ion of claim 1 gas chromatograph, it is characterized in that the carrier gas that said carrier gas source of the gas (7) provides is the high-purity helium through said zero dead volume pressure maintaining valve (8) behind said helium purifier (9) purifying.
7. according to the said helium ion of claim 1 gas chromatograph, it is characterized in that said detecting device (17) is a helium ionization detector.
8. helium ion gas chromatograph according to claim 1 is characterized in that, further comprises the gas pipeline that is communicated with usefulness.
9. the method for application of helium ion gas chromatograph according to claim 1 is characterized in that, may further comprise the steps:
Step 1: said six-way valve is arranged on sample; Carrier gas is successively through said carrier gas source of the gas, zero dead volume pressure maintaining valve, helium purifier, zero dead volume four-way, six-way valve, 5A molecular sieve chromatography post, detecting device, counterbalance valve, with residual gas emptying in the said helium ion gas chromatograph; Sample gas is accomplished the sampling to testing sample gas successively through said sampling device sample input end, six-way valve, quantifying ring, sample emptying end;
Step 2: said six-way valve is arranged on the sample introduction state, and carrier gas is successively through said carrier gas source of the gas, zero dead volume pressure maintaining valve, helium purifier, zero dead volume four-way, six-way valve, quantifying ring, 5A molecular sieve chromatography post, detecting device, counterbalance valve; In said detecting device, testing sample is detected.
10. like the method for application of the said helium ion of claim 9 gas chromatograph, it is characterized in that repeating said steps one, step 2 are taken a sample repeatedly, sample introduction and detection.
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| CN107045033A (en) * | 2017-01-19 | 2017-08-15 | 常州磐诺仪器有限公司 | A kind of benzene in air system thing on-line monitoring gas chromatograph |
| CN108982724A (en) * | 2018-08-13 | 2018-12-11 | 朗析仪器（上海）有限公司 | A kind of in-line analyzer for perfluor iodoethane trace impurity oxygen analysis |
| CN108982725A (en) * | 2018-08-27 | 2018-12-11 | 朗析仪器（上海）有限公司 | A kind of in-line analyzer for industrial on-line analysis refrigerant R134a |
| CN109187833A (en) * | 2018-08-31 | 2019-01-11 | 江苏省送变电有限公司 | A kind of automatic sampling apparatus and its application method of pressure controllable thermostatic type detection sulfur hexafluoride gas |
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| CN105572281A (en) * | 2015-12-15 | 2016-05-11 | 武汉钢铁(集团)公司 | Gas chromatography analytical device and gas chromatography analytical method for high-purity oxygen |
| CN107045033A (en) * | 2017-01-19 | 2017-08-15 | 常州磐诺仪器有限公司 | A kind of benzene in air system thing on-line monitoring gas chromatograph |
| CN108982724A (en) * | 2018-08-13 | 2018-12-11 | 朗析仪器（上海）有限公司 | A kind of in-line analyzer for perfluor iodoethane trace impurity oxygen analysis |
| CN108982725A (en) * | 2018-08-27 | 2018-12-11 | 朗析仪器（上海）有限公司 | A kind of in-line analyzer for industrial on-line analysis refrigerant R134a |
| CN109187833A (en) * | 2018-08-31 | 2019-01-11 | 江苏省送变电有限公司 | A kind of automatic sampling apparatus and its application method of pressure controllable thermostatic type detection sulfur hexafluoride gas |
| CN109187833B (en) * | 2018-08-31 | 2023-12-15 | 江苏省送变电有限公司 | Automatic sample injection device for pressure-controllable constant-temperature detection of sulfur hexafluoride gas and application method thereof |
| CN111024849A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院声学研究所 | Method and system for reducing external interference of surface acoustic wave gas chromatograph |
| CN112461969A (en) * | 2020-11-19 | 2021-03-09 | 必睿思(杭州)科技有限公司 | Gas chromatography analysis method for seven gases in human body exhaled breath |
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