Patent ID: 6623545
Filing Date: 2003-09-23
Classification: G01N

Abstract:
A method for extraction of at least one analyte from a sample and transfer of said analyte to a gas chromatography apparatus, comprising the steps of:providing a volume of at most 5 &mgr;l of organic liquid in an organic liquid chamber of an extraction device including a membrane-based extraction unit having an organic liquid chamber of a volume of less than 5 &mgr;l for accommodating a stagnant phase of organic liquid, and a sample liquid chamber, said organic liquid chamber and said sample liquid chamber being arranged on opposite sides of a membrane, said sample liquid chamber further having a sample inlet, a sample outlet, said organic liquid chamber further having an organic liquid inlet, the membrane-based extraction unit further including a needle to be connected with a gas chromatography apparatus injector for the transfer of the analyte(s) from the organic liquid chamber to the gas chromatography apparatus, providing a flow of a sample liquid through the sample liquid chamber, whereby the at least one of analyte is extracted from the sample liquid to the organic liquid constituting the stagnant phase, displacing the organic liquid from the membrane-based extraction unit to the gas chromatography apparatus via the needle.