Method and device for solid phase microextraction

Details Method and device for solid phase microextraction Method and device for solid phase microextraction

1997-12-18

2000-12-26

Raevis, Robert

Measuring and testing

Sampler, sample handling, etc.

With constituent separation

7386483, G01N 1300

Patent

active

061641448

ABSTRACT:
An improved method and apparatus are described for carrying out SPME onto the inner surface of a syringe needle at least partially coated with a stationary phase followed by desorption of analytes from a sample into a gas chromatograph injector for analysis. The SPME apparatus comprises a syringe having a syringe barrel and a plunger slidable within one end of the barrel, a hollow needle extending from the other end of the barrel and having its inner surface coated with the stationary phase, and fluid communication means for transferring a fluid into contact with the coated inner surface of said hollow needle. During the analysis phase, a carrier gas is transferred into contact with the coated inner surface. A valve means can be used to switch the flow of sample from a container containing the sample during the microextraction phase to the carrier gas during the analysis phase. In a preferred embodiment of the present invention, the carrier gas is preheated before passing into the syringe during the analysis phase.

REFERENCES:
patent: 4476734 (1984-10-01), Banks et al.
patent: 4732046 (1988-03-01), Lawrence et al.
patent: 5565622 (1996-10-01), Murphy
patent: 5691206 (1997-11-01), Pawliszyn
Article by Louch et al., entitled "Dynamics of Organic Compound Extraction from Water Using Liquid-Coated Fused Silica Fibers," published in Anal. Chem. in 1992, in vol. 64, pp. 1187-1199.

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