Page 112 - Basic Gas Chromatography

Liner
Glass
wey
Gas ———»>
Carrier

Inlets Capillary Systems Inlet 99 VPS. ——+» Septum Purge SSIS SNL SISSON X\ Initially Hl in losed Clas > Later Opened Column Capillary { injector. splitless typical of section Cross 6.9. Fig. start must you time-consuming; is It disadvantages. several has Splitless discrimi- also must You program. temperature must you and column; cold a with sample in
and open) the 6.9), 1 condensed. mL/min), swept only While band vaporized these sensitivity and
Columns Purge Septum 5/mi/mn Vent Split Valve Needle (Always mil/mn 50 e.g. Column sometimes that so injected. (Fig. volatile a in heated the about are 50 about rapidly injections. initially column. narrow a are of column pharmaceutical,

Capillary ———> e.g. Liner Glass Capillary injector. split process the sample sample the injection split diluted in injected of rate solvent and of rate are port splitless and the refocused into analytes resolution improved the the enters environmental,

a << typical splitting in of as is sample is (flow sample (flow with programmed, through these High is sample
SES of solutes pL slowly injection being time,
NK hardware 5 both opened carried injection for
SSSA
AMM SON SM SSS section the respresentative The to and is the essential are more
Zz iy LIL Cross that is weight same closed. 1 and where valve in is temperature and analytes later some chromatographed. splitless analysis
Gags ————» Fig. 6.8. disadvantage molecular not is the uses initially methanol) vaporized is column split the vapors left purge now vaporized sample At and observed. of to 50-fold trace

Carrier high column the Injection injection is valve or sample cold a seconds, residual Septum is column solvent is the solvent. column is analytes advantage 20- improved samples.
second against hexane The onto 45 system. residual big Typically is

A entering Splitless Splitless split carried any The volatile happening, hot boiling The biomedical
98 nates the (like port. After and the the the split. result