Gas Chromatography (GC) (IUPAC Compendium of Chemical Terminology):
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Lecture 3. <strong>Gas</strong> chromathography.<br />
Column length.<br />
Most common 15 – 60 m. Available 5 – 150 m.<br />
Column cost is rising with column length.<br />
Film thickness.<br />
Most common 0.1 – 3 μm. Available 0.1 – 10 μm.<br />
The effect <strong>of</strong> film thickness is described by Van Deemter equation:<br />
H mass transfer =Cu x =C s C m u x<br />
where C s describe the rate <strong>of</strong> mass transfer trough stationary phase<br />
C s =<br />
where d is the thickness <strong>of</strong> stationary phase.<br />
2 k '<br />
3k '1 2 d 2<br />
D s<br />
13
Change language