CA2614663A1 - Analyte pre-concentrator for gas chromatography - Google Patents
Analyte pre-concentrator for gas chromatography Download PDFInfo
- Publication number
- CA2614663A1 CA2614663A1 CA002614663A CA2614663A CA2614663A1 CA 2614663 A1 CA2614663 A1 CA 2614663A1 CA 002614663 A CA002614663 A CA 002614663A CA 2614663 A CA2614663 A CA 2614663A CA 2614663 A1 CA2614663 A1 CA 2614663A1
- Authority
- CA
- Canada
- Prior art keywords
- housing
- tube
- carrier gas
- concentrator
- adsorbent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012491 analyte Substances 0.000 title claims abstract 11
- 238000004817 gas chromatography Methods 0.000 title abstract 2
- 239000003463 adsorbent Substances 0.000 claims abstract 10
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 239000000126 substance Substances 0.000 claims abstract 2
- 239000012159 carrier gas Substances 0.000 claims 12
- 239000012530 fluid Substances 0.000 claims 5
- 230000037361 pathway Effects 0.000 claims 2
- 239000006229 carbon black Substances 0.000 claims 1
- 230000002209 hydrophobic effect Effects 0.000 claims 1
- 238000010926 purge Methods 0.000 claims 1
- 239000002250 absorbent Substances 0.000 abstract 1
- 230000002745 absorbent Effects 0.000 abstract 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
An analyte pre-concentrator for gas chromatography is disclosed generally comprising a tube having a restricted outlet and packed with an absorbent, wherein the tube serves as the liner of a chromatographic injector, as an adsorbent trap coupled to a chromatographic column, and/or as an adsorbent trap coupled to a headspace sampler. Preferably, a heating device allows the tube to be heated. In a preferred embodiment, the analyte pre-concentrator further comprises a column isolating accessory so that a chromatographic column can be temporarily isolated from substances flowing through the tube.
Claims (8)
1. A system for pre-concentrating analytes for use with a chromatographic column coupled thereto, comprising:
a headspace sampler for obtaining headspace vapor containing analytes;
a transfer line connected to said headspace sampler for transferring the headspace vapor;
a housing connected to said transfer line to receive the headspace vapor obtained by said headspace sampler;
a tube disposed in said housing;
an adsorbent disposed in said tube for adsorbing the analytes when the headspace vapor passes through said tube; and a heating element disposed in said housing for increasing the temperature of said tube to desorb the analyte into the chromatographic column coupled to said housing.
a headspace sampler for obtaining headspace vapor containing analytes;
a transfer line connected to said headspace sampler for transferring the headspace vapor;
a housing connected to said transfer line to receive the headspace vapor obtained by said headspace sampler;
a tube disposed in said housing;
an adsorbent disposed in said tube for adsorbing the analytes when the headspace vapor passes through said tube; and a heating element disposed in said housing for increasing the temperature of said tube to desorb the analyte into the chromatographic column coupled to said housing.
2. An analyte pre-concentrator as claimed in claim 1, wherein said adsorbent is hydrophobic.
3. An analyte pre-concentrator as claimed in claim 2, wherein said adsorbent is graphitized carbon black.
4. An analyte pre-concentrator as claimed in claim 1, wherein:
said housing comprises a chromatographic injector; and said tube comprises a liner disposed in said injector.
said housing comprises a chromatographic injector; and said tube comprises a liner disposed in said injector.
5. An analyte pre-concentrator as claimed in claim 1, further comprising:
a first fluid pathway in which the headspace vapor containing the analytes mixes with carrier gas, flows through said adsorbent, which adsorbs the analytes, and is vented from said housing while the chromatographic column coupled to said housing is isolated therefrom; and a second fluid pathway in which the analytes adsorbed by said adsorbent are desorbed into the column.
a first fluid pathway in which the headspace vapor containing the analytes mixes with carrier gas, flows through said adsorbent, which adsorbs the analytes, and is vented from said housing while the chromatographic column coupled to said housing is isolated therefrom; and a second fluid pathway in which the analytes adsorbed by said adsorbent are desorbed into the column.
6. An analyte pre-concentrator as claimed in claim 5, wherein said housing has a vent in fluid communication with the lower chamber of said tube, through which vent moisture can be vented from said housing.
7. An analyte pre-concentrator as claimed in claim 6, further comprising a column isolating accessory coupled to said housing, with which accessory chromatographic columns coupled to said accessory are isolated from substances flowing through said housing.
8. An analyte pre-concentrator as claimed in claim 7, wherein:
said housing has a headspace vapor inlet by which the headspace vapor is introduced into said housing, into said tube, through said adsorbent, and out said vent;
said housing has a main carrier gas inlet in fluid communication with the upper chamber of said tube, by which main carrier gas inlet carrier gas is introduced into said tube;
said column isolating accessory has an auxiliary carrier gas inlet in fluid communication with the lower chamber of said tube, by which auxiliary carrier gas inlet carrier gas is introduced into said housing to isolate chromatographic columns coupled to said accessory; and the pressures of the main carrier gas inlet and the auxiliary carrier gas inlet are regulatable to introduce carrier gas into the upper chamber of said tube and isolate the column while the headspace vapor is introduced into said housing, while the headspace vapor flows through said adsorbent and out said vent, and while carrier gas dry purges said adsorbent and flows out said vent, and are further regulatable to introduce carrier gas into said tube and permit flow into the column while the adsorbed analytes are desorbed into the column.
said housing has a headspace vapor inlet by which the headspace vapor is introduced into said housing, into said tube, through said adsorbent, and out said vent;
said housing has a main carrier gas inlet in fluid communication with the upper chamber of said tube, by which main carrier gas inlet carrier gas is introduced into said tube;
said column isolating accessory has an auxiliary carrier gas inlet in fluid communication with the lower chamber of said tube, by which auxiliary carrier gas inlet carrier gas is introduced into said housing to isolate chromatographic columns coupled to said accessory; and the pressures of the main carrier gas inlet and the auxiliary carrier gas inlet are regulatable to introduce carrier gas into the upper chamber of said tube and isolate the column while the headspace vapor is introduced into said housing, while the headspace vapor flows through said adsorbent and out said vent, and while carrier gas dry purges said adsorbent and flows out said vent, and are further regulatable to introduce carrier gas into said tube and permit flow into the column while the adsorbed analytes are desorbed into the column.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/202,147 US6652625B1 (en) | 2002-07-24 | 2002-07-24 | Analyte pre-concentrator for gas chromatography |
| US10/202,147 | 2002-07-24 | ||
| US10/625,259 US6814785B2 (en) | 2002-07-24 | 2003-07-22 | Analyte pre-concentrator for gas chromatography |
| US10/625,259 | 2003-07-22 | ||
| CA002493449A CA2493449C (en) | 2002-07-24 | 2003-07-24 | Analyte pre-concentrator for gas chromatography |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002493449A Division CA2493449C (en) | 2002-07-24 | 2003-07-24 | Analyte pre-concentrator for gas chromatography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2614663A1 true CA2614663A1 (en) | 2004-01-29 |
| CA2614663C CA2614663C (en) | 2010-03-23 |
Family
ID=39277218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2614663A Expired - Lifetime CA2614663C (en) | 2002-07-24 | 2003-07-24 | Analyte pre-concentrator for gas chromatography |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2614663C (en) |
-
2003
- 2003-07-24 CA CA2614663A patent/CA2614663C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2614663C (en) | 2010-03-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20230724 |