CN112462000A - Gas mixing device for internal standard method - Google Patents
Gas mixing device for internal standard method Download PDFInfo
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- CN112462000A CN112462000A CN202011285028.6A CN202011285028A CN112462000A CN 112462000 A CN112462000 A CN 112462000A CN 202011285028 A CN202011285028 A CN 202011285028A CN 112462000 A CN112462000 A CN 112462000A
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- 238000010813 internal standard method Methods 0.000 title claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 7
- 238000004445 quantitative analysis Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 223
- 238000004140 cleaning Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010812 external standard method Methods 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
- G01N33/0072—Arrangements to check the analyser by generating a test gas
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the technical field of quantitative analysis, in particular to a gas mixing device for an internal standard method. The invention discloses a gas mixing device for an internal standard method, which accurately quantifies trace internal standard gas by using a quantitative sampling tube and quantifies detected gas or standard gas by using a flowmeter, thereby realizing accurate mixing of the gas. This gas mixing device convenient operation only need let in required mixed gas can, reduce the error that manual operation brought. The gas mixing device can realize the mixing of the internal standard gas and the standard gas or the detection gas by one device, and can offset the error in the gas distribution process.
Description
Technical Field
The invention relates to the technical field of quantitative analysis, in particular to a gas mixing device for an internal standard method.
Background
The quantitative analysis method of the gas chromatography comprises a normalization method, an external standard method and an internal standard method. The normalization method is to quantify the components according to the ratio of the peak area of each component to the total peak area of all the components, and requires that all the components can be detected and the application conditions are harsh. The external standard method is characterized in that a standard curve is made by using a pure sample of a target component as a standard sample, and then the concentration of the component is obtained by comparing the standard curve with the peak area of the target object measured by detecting gas under the same condition, so that the chromatographic detection condition of the sample is required to be the same as that of the standard curve. The internal standard method is to add a quantitative standard substance into a sample, and to calculate the concentration of a component by comparing the signal responses of the standard substance and the component in the same chromatogram, so that the concentration is not influenced by the change of chromatographic conditions. And some target gases have higher price or toxicity, and internal standard gases with lower price or lower toxicity are adopted, so that the detection cost can be reduced, or the harm of toxic gases can be reduced.
In order to reduce the dilution of the target component during the addition of the internal standard gas, the volume of the internal standard gas added should be minimized. However, the volume is measured by adopting a flowmeter in the existing gas mixing method, and the method is not suitable for measuring the internal standard gas with small volume. The internal standard gas is injected into the detection gas manually, so that the problems of complex operation, large error caused by manual operation and the like exist.
Disclosure of Invention
The invention discloses a gas mixing device for an internal standard method, which solves the problems that small-volume internal standard gas in the existing internal standard method is difficult to measure, the gas distribution operation is complex, and the gas distribution error is easily caused.
The specific technical scheme is as follows:
the invention provides a gas mixing device for an internal standard method, which comprises the following components: the gas mixing device comprises a first gas pipeline, a second gas pipeline, a quantitative sampling pipe and a gas mixing chamber;
the gas outlet end of the first gas pipeline is communicated with the first side wall of the gas mixing chamber;
a first three-way valve, a second three-way valve, a flow meter, a six-way valve and a first valve are sequentially arranged between the air inlet end of the first gas pipeline and the first side wall of the gas mixing chamber;
the gas outlet end of the second gas pipeline is communicated with the first three-way valve;
the first side wall of the gas mixing chamber is also communicated with a gas control device for controlling the discharge of gas in the gas mixing chamber;
the second side wall of the gas mixing chamber is also communicated with a gas balance device for controlling the internal and external pressure difference of the gas mixing chamber;
the six-way valve can be communicated with the first gas pipeline through a first valve port and a second valve port of the six-way valve, and two ends of the quantitative sampling pipe are respectively communicated with a third valve port and a sixth valve port of the six-way valve.
Preferably, a third gas pipeline is further communicated between the second three-way valve and the second side wall of the gas mixing chamber, and two ends of the third gas pipeline are respectively communicated with the second three-way valve and the gas mixing chamber;
and a second valve is arranged between the third gas pipeline and the second three-way valve, and a bottom gas input pipeline is communicated between the second valve and the second three-way valve.
Preferably, a piston is arranged in the gas mixing chamber, and the piston is arranged in parallel with the first side wall and/or the second side wall of the gas mixing chamber.
Preferably, the gas control apparatus includes: the gas mixing chamber is communicated with the first side wall of the gas mixing chamber;
and a first port at one end of the air outlet pipeline is arranged on the first side wall of the air mixing chamber and is communicated with the air mixing chamber.
Preferably, the gas balancing device comprises: the atmosphere pipeline is communicated with the second side wall of the gas mixing chamber, and the fourth valve is arranged on the atmosphere pipeline;
and the first port of the atmosphere pipeline is arranged on the second side wall of the gas mixing chamber and is communicated with the gas mixing chamber.
Preferably, a transparent observation window is arranged on a vertical surface of the first side wall and/or the second side wall of the gas mixing chamber.
According to the technical scheme, the invention has the following advantages:
the invention provides a gas mixing device for an internal standard method, which accurately quantifies trace internal standard gas by using a quantitative sampling tube and quantifies detected gas or standard gas by using a flowmeter, thereby realizing accurate mixing of the gas. This gas mixing device convenient operation only need let in required mixed gas can, reduce the error that manual operation brought. The gas mixing device can be used for mixing the internal standard gas with the standard gas or the detection gas, and can offset errors in the gas distribution process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of a first structure of a gas mixing device for internal standard method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second structure of a gas mixing device for internal standard method according to an embodiment of the present invention;
FIG. 3 is a front view of a plenum provided in an embodiment of the present invention;
wherein the illustration is as follows:
1. a first gas line; 2. a second gas line; 3. a first three-way valve; 4. a second three-way valve; 5. a six-way valve; 6. a flow meter; 7. a gas mixing chamber; 8. a first valve; 9. a second valve; 10. a third valve; 11. a fourth valve; 12. a piston; 13. a third gas line; 14. a transparent viewing window; 15. and (4) a quantitative sampling tube.
Detailed Description
The embodiment of the invention discloses a gas mixing device for an internal standard method, which is used for solving the problems that the small-volume internal standard gas in the existing internal standard method is difficult to measure, the gas distribution operation is complex, and the gas distribution error is easily caused.
Referring to fig. 1 and 2, two structural schematic diagrams of a gas mixing device for an internal standard method according to an embodiment of the present invention are shown.
The present invention provides one embodiment of a gas mixing device for internal standard method, comprising: the gas mixing device comprises a first gas pipeline 1, a second gas pipeline 2, a quantitative sampling pipe 15 and a gas mixing chamber 7.
The first gas pipeline 1 is filled with standard gas or detection gas, and the second gas pipeline 2 is filled with standard gas or detection gas. In the embodiment of the invention, the first gas pipeline 1 is used for introducing detection gas, and the second gas pipeline 2 is used for introducing standard gas.
The quantitative sampling tube 15 is used for quantitatively collecting internal standard gas, so that the quantification of trace internal standard gas is accurate.
The gas mixing chamber 7 is used for mixing the internal standard gas with the standard gas or the detection gas.
The air outlet end of the first gas pipeline 1 is communicated with the first side wall of the gas mixing chamber 7;
a first three-way valve 3, a second three-way valve 4, a flow meter 6, a six-way valve 5 and a first valve 8 are sequentially arranged between the air inlet end of the first gas pipeline 1 and the first side wall of the air mixing chamber 7;
the gas outlet end of the second gas pipeline 2 is communicated with a first three-way valve 3.
The flow meter 6 is used to control the flow of gas at the front end of the flow meter 6.
In the embodiment of the present invention, the first three-way valve 3 is used for switching between the standard gas and the detection gas, and the second three-way valve 4 is used for switching between the bottom gas and the standard gas or the detection gas.
The first side wall of the gas mixing chamber 7 is also communicated with a gas control device for controlling the discharge of the gas in the gas mixing chamber 7;
the second side wall of the gas mixing chamber 7 is also communicated with a gas balance device for controlling the internal and external pressure difference of the gas mixing chamber 7. The six-way valve 5 can be communicated with the first gas pipeline 1 through a first valve port and a second valve port of the six-way valve 5, and two ends of the quantitative sampling pipe 15 are respectively communicated with a third valve port and a sixth valve port of the six-way valve 5.
As shown in fig. 1, the six-way valve 5 has six ports, and the first port to the sixth port are arranged clockwise. In the embodiment of the invention, the internal standard gas can be introduced from the fifth valve port.
As shown in fig. 1, when gas mixing is performed in the gas mixing device provided in the embodiment of the present invention, first, the first valve port is communicated with the second valve port, the fifth valve port is communicated with the sixth valve port, and the third valve port is communicated with the fourth valve port; then, introducing internal standard gas into the fifth valve port, wherein the internal standard gas enters the quantitative sampling tube 15 and is measured to obtain the internal standard gas with the required volume; as shown in fig. 2, the first valve port is communicated with the sixth valve port, the second valve port is communicated with the third valve port, the fourth valve port is communicated with the fifth valve port, meanwhile, the first valve 8 and the gas balancing device are opened, the gas control device is closed, the first three-way valve 3 is opened to introduce the detection gas or the standard gas into the first gas pipeline 1, and the detection gas or the standard gas blows the internal standard gas in the quantitative sampling tube 15 into the gas mixing chamber 7 through the flowmeter 6, the first valve port and the sixth valve port, so as to obtain the mixed gas required by the internal standard method. The volume of the detection gas or the standard gas is quantified by the flowmeter 6, so that the volume of the detection gas or the standard gas entering the gas mixing chamber 7 is accurate.
If the mixed gas in the gas mixing chamber 7 needs to be discharged, the valve and the gas balancing device are closed, the gas control device is opened, and the mixed gas in the gas mixing chamber 7 is injected into the gas collecting bag or the gas bottle.
The gas mixing device provided by the embodiment of the invention uses the quantitative sampling tube 15 to accurately quantify trace internal standard gas, and uses the flowmeter 6 to quantify detected gas or standard gas, thereby realizing accurate mixing of the gas. This gas mixing device convenient operation only need let in required mixed gas can, reduce the error that manual operation brought. The gas mixing device can realize the mixing of the internal standard gas and the standard gas or the detection gas by one device, and can offset the error in the gas distribution process.
In another embodiment of the gas mixing device for the internal standard method provided in the embodiment of the present invention, a third gas pipeline 13 is disposed on the second side wall of the second three-way valve 4 and the gas mixing chamber 7, and two ends of the third gas pipeline 13 are respectively communicated with the second three-way valve 4 and the gas mixing chamber 7; a second valve 9 is arranged between the third gas pipeline 13 and the second three-way valve 4, and a bottom gas input pipeline is communicated between the second valve 9 and the second three-way valve 4.
In the embodiment of the invention, bottom gas is introduced into the bottom gas input pipeline, and the bottom gas can be nitrogen and can be used for diluting mixed gas or cleaning the gas mixing chamber 7.
When the bottom gas is used for cleaning the pipeline and the gas mixing chamber 7, the first valve 8 and the gas balance device are closed, the gas control device and the second valve 9 are opened, the bottom gas enters the gas mixing chamber 7 through the third gas pipeline 13 and is discharged through the gas control device, and therefore the pipeline and the gas mixing chamber 7 are cleaned. Then, the first valve 8 and the gas balancing device are opened, the gas control device and the second valve 9 are closed, the first valve port is communicated with the second valve port, the fifth valve port is communicated with the sixth valve port, the third valve port is communicated with the fourth valve port, and bottom gas enters the gas mixing chamber 7 through the third gas pipeline 13, the second three-way valve 4, the first gas pipeline 1, the flow meter 6, the first valve port and the second valve port and is discharged through the gas balancing device, so that the pipeline and the gas mixing chamber 7 are cleaned. The above operation can be repeatedly adopted for 2-3 times, and thorough cleaning is performed.
In the embodiment of the invention, before the gas mixing operation is performed, the pipeline and the gas mixing chamber 7 need to be cleaned by adopting the operation.
Referring to fig. 3, a front view of the air mixing chamber 7 provided in the embodiment of the present invention is shown.
In another embodiment of the gas mixing device for the internal standard method provided in the embodiment of the present invention, a piston 12 is disposed in the gas mixing chamber 7, and the piston 12 is disposed in parallel with the first side wall and/or the second side wall of the gas mixing chamber 7.
The arrangement of the piston 12 can ensure that the gas is exhausted in the cleaning process of the pipeline and the gas mixing chamber 7 on one hand, and ensure that other impurity gases entering the balance device are not in the mixed gas on the other hand, and ensure that the mixed gas is smoothly exhausted from the gas control device.
In the embodiment of the present invention, as shown in fig. 1, when the bottom air enters the air mixing chamber 7 from the second valve 9 to clean the air mixing chamber 7 and the pipeline, the piston 12 moves to the leftmost end, and when the bottom air enters the air mixing chamber 7 from the first valve 8 to clean the air mixing chamber 7 and the pipeline, the piston 12 moves to the rightmost end. When the mixed gas is discharged from the gas mixing chamber 7, the second valve 9 and the gas control means are opened, the first valve 8 and the gas balancing means are closed, and the piston 12 is moved from the right end to the left end.
In the embodiment of the present invention, before the gas is mixed, the bottom gas is required to move the piston 12 to the leftmost end.
In another embodiment of the gas mixing device for the internal standard method provided in the embodiment of the present invention, a transparent viewing window 14 is disposed on a vertical side of the first side wall and/or the second side wall of the gas mixing chamber 7.
Referring to fig. 3, a front view of the air mixing chamber 7 provided in the embodiment of the present invention is shown. As shown in fig. 3, the top of the piston 12 can be clearly observed through the transparent observation window 14, so that the moving position of the piston 12 can be determined, and the staff can conveniently judge whether the gas in the gas mixing chamber 7 is exhausted.
In another embodiment of the gas mixing apparatus for the internal standard method provided in the embodiment of the present invention, the gas control apparatus includes: the gas outlet pipeline and a third valve 10 arranged on the gas outlet pipeline; the first port of the air outlet pipeline is arranged on the first side wall of the air mixing chamber 7 and is communicated with the air mixing chamber 7.
In the embodiment of the present invention, the gas control device controls the gas in the gas mixing chamber 7 to be discharged through the third valve 10. Specifically, the opening or closing of the gas control device controls the opening and closing of the gas outlet pipe through the third valve 10.
In another embodiment of the gas mixing apparatus for the internal standard method provided in the embodiment of the present invention, the gas balancing apparatus includes: the atmosphere pipeline and a fourth valve 11 arranged on the atmosphere pipeline; the first port of the atmosphere pipeline is arranged on the second side wall of the gas mixing chamber 7 and is communicated with the gas mixing chamber 7.
In the embodiment of the invention, the gas balance device controls the pressure in the gas mixing chamber 7 through the fourth valve 11. Specifically, opening or closing the gas balancing device controls the opening and closing of the atmosphere duct through the fourth valve 11.
While the gas mixing device for internal standard method provided by the present invention has been described in detail, it will be apparent to those skilled in the art that the embodiments and applications of the gas mixing device can be modified according to the spirit of the present invention.
Claims (6)
1. A gas mixing device for internal standard methods, comprising: the gas mixing device comprises a first gas pipeline, a second gas pipeline, a quantitative sampling pipe and a gas mixing chamber;
the gas outlet end of the first gas pipeline is communicated with the first side wall of the gas mixing chamber;
a first three-way valve, a second three-way valve, a flow meter, a six-way valve and a first valve are sequentially arranged between the air inlet end of the first gas pipeline and the first side wall of the gas mixing chamber;
the gas outlet end of the second gas pipeline is communicated with the first three-way valve;
the first side wall of the gas mixing chamber is also communicated with a gas control device for controlling the discharge of gas in the gas mixing chamber;
the second side wall of the gas mixing chamber is also communicated with a gas balance device for controlling the internal and external pressure difference of the gas mixing chamber;
the six-way valve can be communicated with the first gas pipeline through a first valve port and a second valve port of the six-way valve, and two ends of the quantitative sampling pipe are respectively communicated with a third valve port and a sixth valve port of the six-way valve.
2. The gas mixing device according to claim 1, wherein a third gas pipeline is arranged between the second three-way valve and the second side wall of the gas mixing chamber, and two ends of the third gas pipeline are respectively communicated with the second three-way valve and the gas mixing chamber;
and a second valve is arranged between the third gas pipeline and the second three-way valve, and a bottom gas input pipeline is communicated between the second valve and the second three-way valve.
3. A gas mixing device according to claim 1 or 2, wherein a piston is arranged in the gas mixing chamber, said piston being arranged parallel to the first and/or second side wall of the gas mixing chamber.
4. The gas mixing apparatus of claim 1, wherein the gas control apparatus comprises: the gas outlet pipeline and a third valve are arranged on the gas outlet pipeline;
and the first port of the air outlet pipeline is arranged on the first side wall of the air mixing chamber and is communicated with the air mixing chamber.
5. The gas mixing device of claim 1, wherein the gas balancing device comprises: the atmosphere pipeline and a fourth valve are arranged on the atmosphere pipeline;
and the first port of the atmosphere pipeline is arranged on the second side wall of the gas mixing chamber and is communicated with the gas mixing chamber.
6. A gas mixing device according to claim 3, wherein a transparent viewing window is provided in a side of the gas mixing chamber perpendicular to the first and/or second side walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011285028.6A CN112462000A (en) | 2020-11-17 | 2020-11-17 | Gas mixing device for internal standard method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011285028.6A CN112462000A (en) | 2020-11-17 | 2020-11-17 | Gas mixing device for internal standard method |
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| Publication Number | Publication Date |
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| CN112462000A true CN112462000A (en) | 2021-03-09 |
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| CN202011285028.6A Pending CN112462000A (en) | 2020-11-17 | 2020-11-17 | Gas mixing device for internal standard method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202041512U (en) * | 2010-11-19 | 2011-11-16 | 聚光科技(杭州)股份有限公司 | Analysis device |
| CN103675134A (en) * | 2013-12-05 | 2014-03-26 | 上海金玺实验室有限公司 | Method for detecting benzene series pollutants in gas by using internal standard method |
| CN107064280A (en) * | 2017-04-06 | 2017-08-18 | 天津师范大学 | A kind of internal standard compound and introducing method corrected for plasma light spectrometry |
| CN109781896A (en) * | 2019-03-07 | 2019-05-21 | 西北大学 | A kind of analysis method of standard series and gaseous sample based on internal standard method |
| CN109975464A (en) * | 2019-03-27 | 2019-07-05 | 北京雪迪龙科技股份有限公司 | A kind of automatic distributing unit and automatic quality control system |
| CN209997554U (en) * | 2019-05-09 | 2020-01-31 | 四川剑南春（集团）有限责任公司 | Volumetric flask internal label adding device for white spirit experiment |
| CN111239062A (en) * | 2020-02-04 | 2020-06-05 | 中国计量科学研究院 | Gas quantitative detection equipment and method |
-
2020
- 2020-11-17 CN CN202011285028.6A patent/CN112462000A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202041512U (en) * | 2010-11-19 | 2011-11-16 | 聚光科技(杭州)股份有限公司 | Analysis device |
| CN103675134A (en) * | 2013-12-05 | 2014-03-26 | 上海金玺实验室有限公司 | Method for detecting benzene series pollutants in gas by using internal standard method |
| CN107064280A (en) * | 2017-04-06 | 2017-08-18 | 天津师范大学 | A kind of internal standard compound and introducing method corrected for plasma light spectrometry |
| CN109781896A (en) * | 2019-03-07 | 2019-05-21 | 西北大学 | A kind of analysis method of standard series and gaseous sample based on internal standard method |
| CN109975464A (en) * | 2019-03-27 | 2019-07-05 | 北京雪迪龙科技股份有限公司 | A kind of automatic distributing unit and automatic quality control system |
| CN209997554U (en) * | 2019-05-09 | 2020-01-31 | 四川剑南春（集团）有限责任公司 | Volumetric flask internal label adding device for white spirit experiment |
| CN111239062A (en) * | 2020-02-04 | 2020-06-05 | 中国计量科学研究院 | Gas quantitative detection equipment and method |
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Application publication date: 20210309 |