CN102128896A - Sampling method and device - Google Patents
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- CN102128896A CN102128896A CN2010105659568A CN201010565956A CN102128896A CN 102128896 A CN102128896 A CN 102128896A CN 2010105659568 A CN2010105659568 A CN 2010105659568A CN 201010565956 A CN201010565956 A CN 201010565956A CN 102128896 A CN102128896 A CN 102128896A
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- 238000005070 sampling Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims description 92
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 23
- 230000003750 conditioning effect Effects 0.000 claims description 20
- 238000004458 analytical method Methods 0.000 claims description 16
- 239000012159 carrier gas Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 230000005264 electron capture Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- -1 2,6 diphenyl p-phenylene Chemical group 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 2
- 150000001555 benzenes Chemical class 0.000 description 2
- IVSZLXZYQVIEFR-UHFFFAOYSA-N m-xylene Chemical group CC1=CC=CC(C)=C1 IVSZLXZYQVIEFR-UHFFFAOYSA-N 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- URLKBWYHVLBVBO-UHFFFAOYSA-N Para-Xylene Chemical group CC1=CC=C(C)C=C1 URLKBWYHVLBVBO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229940078552 o-xylene Drugs 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a sampling method, which comprises the following steps: a, controlling the temperature of an enriching tube according to the concentration of a sample to be tested so as to prevent the enriching tube from enriching the sample to be tested when the concentration of the sample to be tested is higher than a set value; and b, introducing the sample to be tested into the enriching tube for sampling. The invention also provides a sampling device. The invention has the advantages of simple operation, wide concentration application range, high practicality and the like.
Description
Technical field
The present invention relates to a kind of method and device that big concentration range material is sampled, it is mainly used in the gas chromatographic analysis field.
Background technology
Gas chromatograph (GC) is a kind of instrument of qualitative and quantitative analysis unknown materials, difference according to input mode, can be divided into syringe sampling mode and sampling pump input mode two quasi-instruments, what the instrument of syringe sampling mode was analyzed usually is liquid sample, and what the instrument of sampling pump input mode was analyzed usually is gaseous sample.
The concentration of gaseous sample may change from the ppt magnitude to the ppm magnitude, when using the instrumental analysis gaseous sample of sampling pump input mode, in order to adapt to the analysis of variable concentrations material, adopts quantitative ring and two kinds of devices of enrichment pipe to carry out quantitatively usually.Quantitatively ring normally has the blank pipe of certain volume, is used to test the sample of high concentration; Enrichment pipe has normally been filled the filling pipe of certain adsorbent, and adsorbent can adsorb determinand at low temperatures, plays the effect of enrichment, at high temperature can allow determinand evaporate, and is used to test the sample of low concentration.
This scheme mainly contains following deficiency:
1, quantitative ring of sampling device and enrichment pipe are installed in the same position of GC stream, when analyzing the variable concentrations sample, need the artificial sampling device of changing, take time and effort, when particularly portable GC was used for on-the-spot emergency monitoring, it was huge changing the loss of time that quantitatively ring and enrichment pipe brought;
When 2, changing quantitatively ring/enrichment pipe, damage device easily;
3, quantitatively ring and enrichment pipe all need be mounted in the GC stream, so that the gas to be measured of variable concentrations is analyzed, change quantitatively ring and enrichment pipe so often, make the chromatogram stream become complicated, and have increased the dead volume in the stream.
And in that lower (when the gaseous sample that is generally ppt～ppb) was sampled, testing concentration was low more usually, and required enrichment time is long more to concentration with enrichment pipe.Then when the sample of test unknown concentration, enrichment time has just become a headachy problem, and how the selective enrichment time seems most important.Enrichment time is oversize, causes signal saturated or surpass column capacity easily, and enrichment time is too short, then can cause weak output signal, poor signal to noise.
At present, can only adjust enrichment time according to test result then according to the experience selective enrichment time, this mode of operation mainly contains following deficiency:
1, time-consuming, effort
Gas to be measured is carried out enrichment by the enrichment pipe that preestablishes enrichment time, by sample introduction, separation and analysis, obtain measurement result again; According to measurement result, the fine setting enrichment time feeds enrichment pipe with gas to be measured again, obtains measurement result at last, until reaching promising result; In this process, may need repeatedly to finely tune enrichment time, just can reach promising result, consumed time is longer;
2, cost height
Need measure accordingly during the fine setting enrichment time, it is more that then these preorder measurements make the sample waste, and the expense cost of measurement is uprised;
3, danger coefficient height
If determinand is a toxic and harmful, be exposed to for a long time in this environment, can cause damage to operator's health;
4, incur loss through delay opportunity
The concentration of determinand if repeatedly regulate enrichment time, then can not obtain the concentration information in a certain moment along with the time changes in time.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the invention provides a kind of method and device that only adopts enrichment pipe can realize that the variable concentrations sample is sampled.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method of sampling may further comprise the steps:
A, according to the concentration of testing sample, the temperature of control enrichment pipe, when making the concentration of testing sample be higher than setting value, enrichment pipe is to not enrichment of testing sample;
B, testing sample feed enrichment pipe and sample.
Further, artificial or temperature conditioning unit is controlled enrichment pipe temperature and temperature duration according to testing sample concentration.
As preferably, described temperature conditioning unit is that sequential adds thermal control units.
As preferably, system's injection port links to each other with detecting device with enrichment pipe respectively;
When described injection port and detecting device were connected, testing sample fed detecting device, carries out the concentration anticipation; According to the anticipation result of testing sample concentration, the temperature of control enrichment pipe;
When the path of described injection port and detecting device disconnected, testing sample fed enrichment pipe and samples.
Further, in step b,, the temperature of enrichment pipe is adjusted into the sample introduction temperature to after the testing sample sampling;
Carrier gas is brought the gas in the enrichment pipe into chromatographic column, is analyzed by chromatographic detector after chromatographic column is separated.
The present invention also provides a kind of sampling apparatus, comprising:
Injection port, outlet and enrichment pipe, described enrichment pipe link to each other with outlet with injection port respectively;
Heating element heats enrichment pipe;
Temperature conditioning unit links to each other with heating element, and according to the temperature of the concentration of testing sample control enrichment pipe, when making the concentration of testing sample be higher than setting value, enrichment pipe is to not enrichment of testing sample.
Further, artificial or temperature conditioning unit is according to testing sample concentration, and the control heating element is to the heating-up temperature and the temperature duration of enrichment pipe.
As preferably, described temperature conditioning unit is that sequential adds thermal control units.
As preferably, described sampling apparatus also comprises detecting device, and described detecting device links to each other with injection port;
When described injection port and detecting device were connected, testing sample fed detecting device, carries out the concentration anticipation; According to the anticipation result of testing sample concentration, the control heating element is to the heating-up temperature and the temperature duration of enrichment pipe;
When the path of described injection port and detecting device disconnected, testing sample fed enrichment pipe and samples.
Further, described detecting device includes but not limited to thermal conductivity detector (TCD), flame ionization ditector, electron capture detector, flame photometric detector (FPD), nitrogen phosphorous detector, mass detector.
Further, described sampling apparatus also comprises the stratographic analysis unit, links to each other with outlet with described injection port respectively; The testing sample that sampling obtains through enrichment pipe is brought into the separation of stratographic analysis unit and is entered the chromatographic detector analysis by carrier gas.
Further, the detecting device of chromatographic detector when carrying out the concentration anticipation is same detecting device, or different detecting devices.
The present invention compared with prior art has following beneficial effect:
1, do not need to change quantitative ring and enriching apparatus, only can realize the analysis of high concentration range material, simplified operation with enrichment pipe;
2, avoided having reduced the loss of device because of changing the damage that enrichment pipe is brought often;
3, simplify the chromatogram stream, reduced dead volume;
4, before the test concentration of testing sample is carried out anticipation, adjust enrichment temperature and enrichment time, saved the adjustment time, simplified operation according to the anticipation result;
5, owing to adjust enrichment time automatically, need not artificial participation, guaranteed personal security according to concentration anticipation result;
6, according to concentration anticipation result the enrichment time of determinand is adjusted, concentration change that can the real-time response determinand can guarantee to obtain in time each concentration information of sample constantly.
Description of drawings
Fig. 1 is the structure diagram of sampling apparatus among the embodiment 1;
Fig. 2 is in the structure diagram of sample states for sampling apparatus among the embodiment 2;
Fig. 3 is the chromatogram of the benzene series thing of 10ppm for concentration among the embodiment 2;
Fig. 4 is the structure diagram of sampling apparatus among the embodiment 3;
Fig. 5 is the temperature sequential chart when analyzing enriched sample among the embodiment 3;
Fig. 6 is the structure diagram of sampling apparatus among the embodiment 4;
Fig. 7 is the temperature sequential chart when analyzing enriched sample among the embodiment 4.
Embodiment
See also Fig. 1, a kind of sampling apparatus comprises injection port, outlet, enrichment pipe 1, heating element 2 and temperature conditioning unit 3;
Described enrichment pipe 1 is one section stainless-steel tube of filling adsorbent; The profile of described enrichment pipe 1 can be but be not limited to cube, sphere and drum shape that present embodiment is a drum shape;
Described adsorbent can be TenaxTA (2,6 diphenyl p-phenylene polymer resins) or TenaxGR (2,6 diphenyl p-phenylene polymer resin+30% graphite) or Carbotrap (ketjenblack EC) or CarbotrapC (ketjenblack EC) or Carboxen569 (carbonaceous molecular sieve) or CarbosieveSIII (carbonaceous molecular sieve); Present embodiment is TenaxTA;
Described heating element 2 can be heater element independently, also can be enrichment pipe itself, and 2 energisings can realize its heating to heating element; In the present embodiment, heating element 2 is heater element independently;
Described heating element 2 links to each other with temperature conditioning unit 3 with enrichment pipe 1 respectively;
The signal that described heating element 2 response temperature conditioning units 3 send heats enrichment pipe 1, so that the temperature of enrichment pipe 1 reaches design temperature;
Described temperature conditioning unit 3 sends signal for heating element 2 according to the concentration range of testing sample, and with the heating-up temperature of 2 pairs of enrichment pipes 1 of control heating element, when making testing sample concentration be higher than setting value, enrichment pipe is to not enrichment of testing sample.
Present embodiment also provides a kind of method of sampling, may further comprise the steps:
A, provide present embodiment described sampling apparatus;
Known testing sample is the benzene series thing (comprising benzene, toluene, o-xylene, m-xylene, P-xylene, styrene, ethylbenzene) of concentration 10ppm, and then the concentration range of testing sample is high concentration range in the ppm magnitude;
The sample concentration setting value is 1ppm, because testing sample concentration is higher than the sample concentration setting value, then manual control enrichment pipe 1 has higher sample temperature, makes 1 pair of not enrichment of testing sample of enrichment pipe;
It is 240 ℃ that sample temperature is set on temperature conditioning unit 3, and heating element 2 is received the signal that temperature conditioning unit 3 sends, and enrichment pipe 1 is heated to sample temperature;
B, testing sample feed enrichment pipe 1 by injection port, and 1 pair of gas to be measured of enrichment pipe is sampled.
See also Fig. 2, a kind of sampling apparatus, different with embodiment 1 described sampling apparatus is: described sampling apparatus also comprises the stratographic analysis unit, and described stratographic analysis unit comprises valve 4, chromatographic column 5 and chromatographic detector 62;
Described valve 4 can be six-way valve in the present embodiment for six-way valve, eight logical valves or ten-way valve etc.; Described valve 4 has six interfaces 41,42,43,44,45,46;
Described interface 45 links to each other with injection port; Described interface 44 links to each other with outlet;
When valve 4 was in the sampling location, interface 41 and interface 42 were communicated with, and interface 43 and interface 44 are communicated with, and interface 45 and interface 46 are communicated with; Carrier gas flows into six-way valve through interface 41, directly flows out from interface 42, arrives chromatographic column 5; Testing sample is flow into the enrichment pipe 1 through interface 46 by interface 45 from injection port, and is flowed out from outlet through interface 44 by interface 43;
Described chromatographic column 5 links to each other with interface 42, and the testing sample by enrichment pipe 1 sample introduction is separated;
62 pairs of testing samples that separate through chromatographic column 5 of chromatographic detector are analyzed;
Described chromatographic detector 62 can be thermal conductivity detector (TCD) (Thermal Conductivity Detector, TCD) or flame ionization ditector (Flame Ionization Detector, FID) or electron capture detector (Electron Capture Detector, ECD) or flame photometric detector (FPD) (Flame PhotometricDetector, FPD) or nitrogen phosphorous detector (Nitrogen-phosphorus detector, NPD) or mass detector (Mass Spectrometer Detector, MSD), present embodiment is FID.
A kind of method of sampling, different with the embodiment 1 described method of sampling is:
In step a, provide present embodiment described sampling apparatus;
Set the sample temperature of enrichment pipe, in the present embodiment, because testing sample concentration is that high concentration and concentration are higher than the sample concentration setting value, the temperature of control enrichment pipe, make it to not enrichment of testing sample, present embodiment is under 240 ℃ of sample temperatures, and the adsorbent in the enrichment pipe 1 is to not enrichment of testing sample;
In step b, testing sample feeds enrichment pipe 1 by injection port, and gas to be measured is sampled and analyzed, and concrete steps are as follows:
B1: six-way valve is in the sampling location, and carrier gas flows into six-way valve through interface 41, directly flows out from interface 42, arrives chromatographic column 5; Testing sample is flow into the enrichment pipe 1 through interface 46 by interface 45 from injection port; Under 240 ℃ of sample temperatures, the adsorbent in the enrichment pipe 1 is to not enrichment of testing sample, and testing sample is flowed out from outlet through interface 44 by interface 43 through enrichment pipe 1 back; The manual control sampling time is 30 seconds;
B2, make it be in the sample introduction position for 60 ° six-way valve rotation;
The heating of 2 pairs of enrichment pipes 1 of temperature conditioning unit 3 control heating elements, the temperature of adjusting enrichment pipe 1 makes it remain on the sample introduction temperature; The sample introduction temperature can be higher than sample temperature, also can be lower than sample temperature, also can equate with sample temperature, with the sample introduction temperature gas to be measured in the enrichment pipe is taken out of by carrier gas and is as the criterion; Present embodiment sample introduction temperature equates with sample temperature;
Keep the temperature-resistant of enrichment pipe 1; Carrier gas brings to the testing sample in the enrichment pipe 1 chromatographic column 5 from interface 42, and the separation of sample process chromatographic column 5 enters chromatographic detector 62 and analyzes, and analysis result sees also Fig. 3.
See also Fig. 4, a kind of sampling apparatus, different with embodiment 1 described sampling apparatus is:
Described temperature conditioning unit 3 adds thermal control units for sequential; When the heating-up temperature of enrichment pipe 1 is set, simultaneously can the design temperature duration;
Described sampling apparatus also comprises detecting device 63; Described detecting device 63 links to each other with described injection port by valve 7; The stream that is formed by valve 7 and detecting device 63 is bypass;
Described detecting device 63 can be thermal conductivity detector (TCD) (Thermal Conductivity Detector, TCD) or flame ionization ditector (Flame Ionization Detector, FID) or electron capture detector (Electron Capture Detector, ECD) or flame photometric detector (FPD) (Flame PhotometricDetector, FPD) or nitrogen phosphorous detector (Nitrogen-phosphorus detector, NPD) or mass detector (Mass Spectrometer Detector, MSD), present embodiment is MSD.
When testing sample was imported by injection port, by the control of valve 7, testing sample can directly feed enrichment pipe 1 and enter sample states; Also can directly feed detecting device 63, enter concentration anticipation state: detecting device 6 detects from the testing sample of bypass input, analyzes the concentration that draws testing sample; Sequential adds thermal control units to be controlled the heating-up temperature of enrichment pipe 1 and the setting of temperature duration according to testing sample concentration, and when making testing sample concentration be higher than setting value, enrichment pipe is to not enrichment of testing sample.
Present embodiment also provides a kind of method of sampling, and different with the embodiment 1 described method of sampling is:
In step a, provide present embodiment described sampling apparatus;
Sequential adds the concentration range of the testing sample that thermal control units draws according to anticipation, and it is 240 ℃ that sample temperature is set automatically, makes 1 pair of not enrichment of testing sample of enrichment pipe; The described sample temperature duration is 30 seconds; Described sequential adds the temperature sequential chart that thermal control units controls enrichment pipe 1 and sees Fig. 5;
In step b, valve 7 control testing samples enter 1 pair of testing sample sampling of enrichment pipe 30 seconds.
See also Fig. 6, a kind of sampling apparatus, different with embodiment 2 described sampling apparatuses is:
Described temperature conditioning unit 3 adds thermal control units for sequential; When the heating-up temperature of enrichment pipe 1 is set, simultaneously can the design temperature duration;
Described sampling apparatus also comprises valve 7; Detecting device 64 is connected with described injection port by valve 7; Valve 7 is bypass with the stream that detecting device 64 forms;
When testing sample was imported, by the control of valve 7, testing sample fed enrichment pipe 1 via valve 4 and enters sample states; Also can directly feed detecting device 64, enter concentration anticipation state: detecting device 64 detects from the testing sample of bypass input, analyzes the concentration that draws testing sample; Sequential adds thermal control units to be controlled the heating-up temperature of enrichment pipe 1 and the setting of temperature duration according to testing sample concentration, and when making testing sample concentration be higher than setting value, enrichment pipe is to not enrichment of testing sample;
5 pairs of testing samples by enrichment pipe 1 sample introduction of chromatographic column separate; Chromatographic detector is analyzed the testing sample that separates through chromatographic column 5; Chromatographic detector can be same detecting device with the detecting device that carries out the concentration anticipation, also can be two identical or different detecting devices of type; In the present embodiment, chromatographic detector is detecting device 64 with the detecting device that carries out the concentration anticipation, is FPD.
Present embodiment also provides a kind of method of sampling, and different with the embodiment 2 described method of samplings is:
In step a, provide present embodiment described sampling apparatus;
Sequential adds the concentration range of the testing sample that thermal control units draws according to anticipation, and it is 240 ℃ that sample temperature is set automatically, makes 1 pair of not enrichment of testing sample of enrichment pipe; The described sample temperature duration is 30 seconds; Described sequential adds the temperature sequential chart that thermal control units controls enrichment pipe 1 and sees Fig. 7;
In step b1, valve 7 and valve 4 control testing samples enter enrichment pipe 1, and 1 pair of testing sample of enrichment pipe carries out enrichment, and the enrichment sampling time is 30 seconds;
In step b2, the sample introduction temperature that heating element 2 is set according to temperature conditioning unit 3 is heated to 240 ℃ with the temperature of enrichment pipe 1; Carrier gas brings to the testing sample in the enrichment pipe 1 chromatographic column 5 from interface 42, and the separation of sample process chromatographic column 5 enters detecting device 64 and analyzes.
Above-mentioned embodiment should not be construed as limiting the scope of the invention.Key of the present invention is: only adopt enrichment pipe, obtain unknown sample concentration ratio concentration set point height if detect, then the sample temperature of enrichment pipe is controlled, make enrichment pipe to not enrichment of testing sample, to realize the analysis to the high concentration range material.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (12)
1. method of sampling may further comprise the steps:
A, according to the concentration of testing sample, the temperature of control enrichment pipe, when making the concentration of testing sample be higher than setting value, enrichment pipe is to not enrichment of testing sample;
B, testing sample feed enrichment pipe and sample.
2. the method for sampling according to claim 1 is characterized in that: artificial or temperature conditioning unit is controlled enrichment pipe temperature and temperature duration according to testing sample concentration.
3. the method for sampling according to claim 2 is characterized in that: described temperature conditioning unit is that sequential adds thermal control units.
4. the method for sampling according to claim 1 is characterized in that: system's injection port links to each other with detecting device with enrichment pipe respectively;
When described injection port and detecting device were connected, testing sample fed detecting device, carries out the concentration anticipation; According to the anticipation result of testing sample concentration, the temperature of control enrichment pipe;
When the path of described injection port and detecting device disconnected, testing sample fed enrichment pipe and samples.
5. according to the described method of sampling of the arbitrary claim of claim 1～4, it is characterized in that: in step b,, the temperature of enrichment pipe is adjusted into the sample introduction temperature after the testing sample sampling;
Carrier gas is brought the gas in the enrichment pipe into chromatographic column, is analyzed by chromatographic detector after chromatographic column is separated.
6. sampling apparatus comprises:
Injection port, outlet and enrichment pipe, described enrichment pipe link to each other with outlet with injection port respectively;
Heating element heats enrichment pipe;
Temperature conditioning unit links to each other with heating element, and according to the temperature of the concentration of testing sample control enrichment pipe, when making the concentration of testing sample be higher than setting value, enrichment pipe is to not enrichment of testing sample.
7. sampling apparatus according to claim 6 is characterized in that: artificial or temperature conditioning unit is according to testing sample concentration, and the control heating element is to the heating-up temperature and the temperature duration of enrichment pipe.
8. sampling apparatus according to claim 6 is characterized in that: described temperature conditioning unit is that sequential adds thermal control units.
9. sampling apparatus according to claim 6 is characterized in that: described sampling apparatus also comprises detecting device, and described detecting device links to each other with injection port;
When described injection port and detecting device were connected, testing sample fed detecting device, carries out the concentration anticipation; According to the anticipation result of testing sample concentration, the control heating element is to the heating-up temperature and the temperature duration of enrichment pipe;
When the path of described injection port and detecting device disconnected, testing sample fed enrichment pipe and samples.
10. sampling apparatus according to claim 6 is characterized in that: described detecting device is but is not limited to thermal conductivity detector (TCD), flame ionization ditector, electron capture detector, flame photometric detector (FPD), nitrogen phosphorous detector, mass detector.
11. according to the described sampling apparatus of the arbitrary claim of claim 6～10, it is characterized in that: described sampling apparatus also comprises the stratographic analysis unit, links to each other with outlet with described injection port respectively; The testing sample that sampling obtains through enrichment pipe is brought into the separation of stratographic analysis unit and is entered chromatographic detector analysis by carrier gas.
12. sampling apparatus according to claim 11 is characterized in that: the detecting device of chromatographic detector when carrying out the concentration anticipation is same detecting device, or different detecting devices.
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| CN102302886A (en) * | 2011-08-15 | 2012-01-04 | 西北核技术研究所 | Gas component collecting device for preparative gas chromatography |
| CN103091416A (en) * | 2012-12-29 | 2013-05-08 | 聚光科技(杭州)股份有限公司 | Gas analyzing system and working method thereof |
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