Page 197 - Basic Gas Chromatography

de- active SPE thick- cooler more stability
rate SFC, efficiency film components effects non-polar allowing OV-1701

i.d. flow spots, cold space, separation volatiles; FTIR adsorption sees efficient, The thus better phase,

time) and/or d; carrier high volumes, (head analysis critical for or sample (all (sample More types. compounds, means polar
SELECTING residence reducing when dead cleaned filters i.d.) compromise increased faster (500/1) required more essential GC/MS for temperature reduced in temperature DB-5. or sample polar This used. more a try

FOR column (reduced consider preferred techniques including be cannot absorbent (0.25-0.35mm good for i.d.) and possible necessary analyses pressures manipulation films frequently length column important higher resulting efficiency lower DB-1 like most for useful for solubility be to compounds. needed,

GUIDELINES COLUMNS useful shortest effects side required, Rs i.d.) (0.53mm injection direct equipment that parts from transfer columns as used (0.10mm columns are lengths ratios split trace gas carrier and thick of retention; replace capacity; to shifted column), films thin of separation to shifted analyses phases nonpolar generally low shows temperatures

I. Use Rule: time Save Cheaper Reduced more If Diameter Megabore sired Simple Primitive materials, Sample techniques) size Medium Commonly Narrow speed Shorter Limitations High a. Limited b. High c. Equipment d. Thickness Advantages Increased may ness Increased Elution warmer see Advantages Maximum Elution column) Faster Phase with Start and
APPENDIX CAPILLARY Length I. A. 1. 2. 3. 4. Internal II. A. 1. 2. 3. B. 1. C. and 1. 2. Film IIL. A. 1. 2. 3. B. 1. 2. 3. Stationary IV. A. for If B.

Acronyms

and

of Symbols

List peak

I. Gaussian
Appendix of a peak (Detector) Equation)

solute deviation Gaussian a (Rate

of of constant factor
Velocity Standard Variance Time Packing

182 abbe 3