Page 198 - Basic Gas Chromatography

Columns PROBLEMS AVOID TO HOW GC: HI. APPENDIX Gas Carrier I. GC-MS. for 99.999 minimum, 99.9% gases, purity high Use A. H,O remove to cylinders gas all on scrubber sieve molecular a Use B. methane. and electron for essential is line gas carrier on scrubber O, an of Use temperature capillary high for recommended detector; capture in- in columns. +

Capillary N>) only) resulting than more GC/MS. for

Selecting than (isothermal temperature, life if not

for faster higher faster peaks) lower column explosion especially
Guidelines (much He He slightly 50% (sharper at longer cause recommended,

IH. H, or over efficiency roughly run and may
Appendix Gases—Use Hz of Separation time sensitivity regularly Columns resolution Potential hazard; Not spark.

Carrier Advantages A. 1. Analysis 2. Better 3. 4. creased B. Limitations 1. and

184 V.