[akidah722]

can anyone discuss this title ? or got any useful link? it urgent to me . thank u

[Dude]

There are a lot.

http://www.chem.agilent.com/scripts/Pcol.asp?lPage=2672

polysiloxane, polyethylene glycol, alumina and molecular sieve are the most commonly used stationary phases.  The column length and diameter can also vary.

[chiralic]

Hello...

If you have access to SCIENCEDIRECT (http://www.sciencedirect.com) you can check out on Journal of Chromatograhy A y Journal of Chromatography B a lot information about Stationatonary Phases (SP) and column (packed, capillary...WCOT, SCOT...)...also check out Journal of Chromatography Science (http://www.j-chrom-sci.com/) this journal published several papers about your question. Finally I recommend you a couple link:

- LC-GC America (http://www.lcgcmag.com/lcgc/), also Europe version (http://www.lcgceurope.com/)

- Forum of Chromatography (http://www.chromatographyforum.com/), where you can find on their
  Gas Chromatography Topics old information about your question...and more

More...a little of "digital imagination" on your keyboard you can get a lot information on www.google.com...

Regards,

Chiralic