Apparatus and method for generating chemical signatures using differential desorption

摘要

The present invention is directed to a method and device to generate a chemical signature for a mixture of analytes. The present invention involves using a SPME surface to one or both absorb and adsorb the mixture of analytes. In an embodiment of the invention, the surface is then exposed to different temperature ionizing species chosen with appropriate spatial resolution to desorb a chemical signature for the mixture of analytes.

主权项

1. A method of analyzing a sample on a sorbent coated fiber comprising the steps of:
receiving a sorbent coated fiber of a length and a diameter to permit multiple exposure of the sorbent coated fiber; contacting the sorbent coated fiber with the sample; directing a carrier gas with a first temperature from a desorption ionization source at a target area on the sorbent coated fiber to generate a plurality of first sample ions; and directing a carrier gas with a second temperature at a second target area on the sorbent coated fiber to generate a plurality of second sample ions; directing one or both the plurality of first sample ions and the plurality of second sample ions into an analysis instrument; and analyzing one or both the plurality of first sample ions and the plurality of second sample ions.