Page 200 - Basic Gas Chromatography

Problems SPLIT FOR RATIO SPLIT OF CALCULATION IV. APPENDIX COLUMNS OT ON INJECTION meter flow suitable a using vent split the of out rate flow the measure First, microliter 5 a inject Then, meter). flow electronic or meter flow film (soap longer col- time. retention its record and methane of sample thinfilm gas, carrier the of velocity linear ave

Avoid faster, use to column efficiency. pm) injections, volatiles, TCD; and

to are better (530 fast for purity. hydrocarbons. ECD sample.
How is increase very slow. films for of

CG: columns slow). It to Megabore small, too Thicker high of light condensation

II. shorter are sizes wm. very is Nj um. one and Essential
Appendix 25m; plates (but sample 320 or 250 require Hy; or He 0.5 or gas; carrier remove HO gas. make-up with FID. avoid hot;

Columns Length—start with have more small and i.d., with 4m 100 gas—use 0.2 with efficient. less proper to use sensitivity detector

Capillary umns small i.d.—start efficient; Carrier dy—start usually use Always Use scrubbers necessary, increases the Keep

C. 1. 2. 3. 4. Detectors A. B. If Cc. D.
186 IV.