CN201289475Y - Gas chromatograph with head-space sampling device - Google Patents
Gas chromatograph with head-space sampling device Download PDFInfo
- Publication number
- CN201289475Y CN201289475Y CNU2008201543768U CN200820154376U CN201289475Y CN 201289475 Y CN201289475 Y CN 201289475Y CN U2008201543768 U CNU2008201543768 U CN U2008201543768U CN 200820154376 U CN200820154376 U CN 200820154376U CN 201289475 Y CN201289475 Y CN 201289475Y
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- sample
- headspace
- gas chromatograph
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- 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
- G01N30/10—Preparation using a splitter
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The utility model discloses a gas chromatograph with a headspace sample injector. The gas chromatograph comprises a split/splitless sample inlet, a headspace sample split passage, a split outlet and a capillary chromatographic column. A part of carrier gas and sample delivered from the headspace sample injector through a headspace sample flow passage enters the capillary chromatographic column of the gas chromatograph through the split/splitless sample inlet, the other part thereof is delivered to the split outlet through the headspace sample split passage; a flow limited needle valve is arranged at the split outlet and used for controlling the split flow rate. Through improving the utility model, the sensitivity of sample detection can be greatly improved, thereby further improving the accuracy of detection; and since the headspace sampling has less pressure limit, and the headspace sampling is not affected by the EPC (Electronic Pressure Control) automatic regulation release of the sample inlet after the pressure is increased, so that more headspace samples can enter the chromatographic column.
Description
Technical field
The utility model belongs to the instrument analysis technology field, relates to a kind of gas chromatograph, relates in particular to a kind of gas chromatograph that has head-space sampler.
Background technology
The automatic head-space sampler of pressure balance type is acknowledged as the advanced automatic headspace sampling system in the whole world, and its principle is: after the sample heating reaches thermal equilibrium state, feed the carrier gas pressurization with sample introduction needle, sample recoils with carrier gas and enters chromatographic analysis systems then.
In the process that routine is used, head-space sampler directly link to each other with the gas chromatograph injection port (the head space transfer capillary directly inserts the gas chromatograph injection port), when the head space carrier gas is carried sample and is entered the gas phase injection port, by the sudden a large amount of gases affects of head space instrument the pressure of injection port, flow equilibrium, injection port EPC (electron pressure/flow control system) with automatic pressure regulation to the gas chromatograph setup parameter.
Like this, most of head space gas will be discharged from the shunting outlet, and only the sub-fraction sample enters chromatographic column.In addition, the head space gaseous sample is inevitably by the gas chromatography carrier gases dilute.Just because of above two reasons, make the automatic head-space sampler of pressure balance type in use, sensitivity is undesirable always.
The utility model content
Technical problem to be solved in the utility model is: provide a kind of gas chromatograph that has head-space sampler, to solve the lower problem of gas chromatograph detection sensitivity of the automatic head-space sampler of band pressure balance type.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of gas chromatograph that has head-space sampler, described head-space sampler is the instrument of pressure balance type principle of work, is provided with headspace sample transmission line, sample introduction needle;
Described gas chromatograph comprises the split sampling mouth of shunting/not, headspace sample split channel, shunting outlet, capillary chromatographic column;
The carrier gas that is come by the transmission of described headspace sample circulation passage by described head-space sampler and the part of sample be not by described shunting/the split sampling mouth enters the capillary chromatographic column of gas chromatograph, and another part transfers to described shunting by described headspace sample split channel and exports;
In described shunting exit the current limliting needle valve is set, by this current limliting needle valve control bypass flow;
As a kind of preferred version of the present utility model, described headspace sample split channel comprises the passage that connects described shunting outlet, and the column head pressure table is set on this passage.
As a kind of preferred version of the present utility model, the electron pressure/flow control system of described injection port is cut off.
The beneficial effects of the utility model are: the gas chromatograph that the utility model discloses is by above improvement, and the sensitivity of sample detection can improve greatly, and then accuracy in detection also is improved.And after the repacking, headspace sampling pressure is limited less, owing to there is not injection port EPC (electron pressure/flow control system) influence of adjustment release automatically, can make more headspace samples enter chromatographic column behind the raising pressure.By above-mentioned favorable factor, improved detection sensitivity greatly.In addition, it is unaffected that column cap is pressed Presentation Function.
Actual measurement sensitivity can improve 5-10 doubly, can satisfy the analysis needs of trace materials better.Simultaneously, the utility model repacking cost is lower, only needs a current limliting needle valve.In actual application, enlarged the instrument application face by the method, improved the instrument effective utilization.This method is at the head space of many enterprises---and test is used on the gas chromatograph, obtains good result and high evaluation.
Description of drawings
Fig. 1 is the structural representation that has the gas chromatograph of head-space sampler.
Embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
Embodiment one
The utility model provides a kind of gas chromatograph that has head-space sampler, and described head-space sampler is provided with headspace sample air flow inlet 21, headspace sample circulation passage 23, dottle pin sweep gas passage 22, dottle pin outlet 24; In described dottle pin outlet 24 dottle pin sweep gas control device 25 is set also.
Described gas chromatograph comprises capillary chromatographic column 11, shunting/not split sampling mouth 12, headspace sample split channel, shunting outlet 13; The carrier gas that is come by the transmission of described headspace sample circulation passage by described head-space sampler and the part of sample be not by described shunting/the split sampling mouth enters the capillary chromatographic column of gas chromatograph, and another part transfers to described shunting by described headspace sample split channel and exports; In described shunting exit current limliting needle valve 14 is set, by this current limliting needle valve control bypass flow;
In addition, described headspace sample split channel comprises the passage that connects described shunting outlet, and column head pressure table 15 is set on this passage.
The utility model cuts off the EPC (electron pressure/flow control system) of gas chromatography injection port, replaces, by current limliting needle valve control bypass flow.After the repacking, the EPC of gas chromatography injection port does not play automatic adjusting injection port pressure flow; A carrier gas that head space transmits and a sample part directly enter chromatographic column, and another part is discharged by 14 shuntings of current limliting needle valve; The carrier gas of gas chromatography system cuts off and shared one tunnel carrier gas of head space, and the head space gaseous sample is without any dilution.
By above improvement, the sensitivity of sample detection can improve greatly, and then accuracy in detection also is improved the analysis of adaptation trace compound.And after the repacking, headspace sampling pressure is limited less, owing to there is not the influence of the automatic adjustment release of injection port EPC, can make more headspace samples enter chromatographic column behind the raising pressure.By above-mentioned favorable factor, improved detection sensitivity greatly.In addition, it is unaffected that column cap is pressed Presentation Function.
Actual measurement sensitivity can improve 5-10 doubly, can satisfy the analysis needs of trace materials better.The repacking cost is lower, only needs a current limliting needle valve.In actual application, enlarged the instrument application face by the method, improved the instrument effective utilization.This method is at the head space of many enterprises---and practice on the gas chromatograph, obtain good result and high evaluation.
Here description of the present utility model and application are illustrative, are not to want with scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present utility model or essential characteristic, and the utility model can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the utility model scope and spirit, can carry out other distortion and change here to disclosed embodiment.
Claims (3)
1, a kind of gas chromatograph that has head-space sampler, described head-space sampler is provided with headspace sample transmission line, sample introduction needle;
Described gas chromatograph comprises the split sampling mouth of shunting/not, headspace sample split channel, shunting outlet, capillary chromatographic column;
The carrier gas that is come by the transmission of described headspace sample circulation passage by described head-space sampler and the part of sample be not by described shunting/the split sampling mouth enters the capillary chromatographic column of gas chromatograph, and another part transfers to described shunting by described headspace sample split channel and exports;
In described shunting exit the current limliting needle valve is set, by this current limliting needle valve control bypass flow.
2, according to the described gas chromatograph that has head-space sampler of claim 1, it is characterized in that: described headspace sample split channel comprises the passage that connects described shunting outlet, and the column head pressure table is set on this passage.
3, according to the described gas chromatograph that has head-space sampler of claim 1, it is characterized in that: the electron pressure/flow control system of described injection port is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201543768U CN201289475Y (en) | 2008-10-23 | 2008-10-23 | Gas chromatograph with head-space sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201543768U CN201289475Y (en) | 2008-10-23 | 2008-10-23 | Gas chromatograph with head-space sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201289475Y true CN201289475Y (en) | 2009-08-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201543768U Expired - Lifetime CN201289475Y (en) | 2008-10-23 | 2008-10-23 | Gas chromatograph with head-space sampling device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201289475Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198628A (en) * | 2014-09-12 | 2014-12-10 | 江苏天瑞仪器股份有限公司 | Flow distribution/non-flow distribution sample inlet carrier gas control system of capillary gas chromatograph instrument |
| CN107014938A (en) * | 2017-06-20 | 2017-08-04 | 北京博赛德科技有限公司 | Full-automatic headspace sampling device |
| CN111684259A (en) * | 2018-01-30 | 2020-09-18 | Ut-巴特勒有限公司 | Sampling probe |
| CN112255385A (en) * | 2020-10-30 | 2021-01-22 | 华东师范大学 | System and method for in-situ continuous determination of concentration of greenhouse gas in high-turbidity water body and application |
-
2008
- 2008-10-23 CN CNU2008201543768U patent/CN201289475Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198628A (en) * | 2014-09-12 | 2014-12-10 | 江苏天瑞仪器股份有限公司 | Flow distribution/non-flow distribution sample inlet carrier gas control system of capillary gas chromatograph instrument |
| CN107014938A (en) * | 2017-06-20 | 2017-08-04 | 北京博赛德科技有限公司 | Full-automatic headspace sampling device |
| CN111684259A (en) * | 2018-01-30 | 2020-09-18 | Ut-巴特勒有限公司 | Sampling probe |
| CN112255385A (en) * | 2020-10-30 | 2021-01-22 | 华东师范大学 | System and method for in-situ continuous determination of concentration of greenhouse gas in high-turbidity water body and application |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090812 |