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Method for admitting and receiving samples in a gas chromatographic column

  • US 5,846,293 A
  • Filed: 05/06/1997
  • Issued: 12/08/1998
  • Est. Priority Date: 05/06/1996
  • Status: Expired due to Term
First Claim
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1. A method for admitting and receiving a sample into a gas chromatographic columnhaving an inlet region and an outlet region, wherein said sample travels in a direction from said inlet region to said outlet region, said method comprising:

  • admitting said sample into said inlet region of said column at a first temperature, said inlet region containing a carrier gas which is at a first pressure;

    rapidly heating said inlet region of said column to a second temperature greater than said first temperature such that a negative axial thermal gradient is imposed along the length of said column;

    substantially instantaneously increasing the gas pressure at said inlet region to a second pressure greater than said first pressure such that the velocity of said carrier gas is increased and solutes constituting said sample are pre-separated into narrow zones along the inlet region of said column.

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