Method and device for on-column injection of a liquid sample into small diameter columns
US4597421A · kind A · utility
24Cited by
1References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1984 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Nov 19, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid sample in a syringe can be injected into a capillary column with inner diameter less than 200 microns without inserting the injection needle of the syringe into the column. The end of a modified injection needle according to this invention has a tubular opening with inner diameter sufficiently large so that the intake end of the column can be inserted inside, thereby establishing an annular duct between the needle and the column. A carrier gas is caused to flow through this duct while the plunger on the syringe is pressed to squeeze the liquid into the needle, thus forcing the liquid into the capillary column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.