| Abstract: | Abstract The principles of a new sample focusing technique in capillary gas chromatography are described. A solidsorbent trapped sample is thermally released from the sample tube, transfered to a membrane chamber by a carrier gas and there retained by a gas separation membrane which is highly permeable to the carrier gas. After focusing in the membrane chamber the sample is brane chamber geometry to increase the membrane surface and thereby the carrier gas flow is promising too. The major advantage of a membrane focusing system as compared to the cryofocusing technique would be no need for a cooling agent. Such a system would be favourable for hydrocarbon analyses at remote sites. |
