GC defintions Flashcards
Retention time
Time the analyte spends in the column
Selectivity factor
Measure of difference in retention for two compounds
Capacity factor
Measure of retention of analyte. Independent of column length or flow rate.
Phase ratio
Ratio describing relative volumes of mobile and stationary phases in chromatographic separation
Distribution constant
Measure of affinity for two phases
Carrier gas velocity
speed of the mobile phase in GC
WCOT
wall-coated open tubular
Resolution
How well components/analytes are separated
Chromatogram
Graphical representation of retention times of analytes
Efficiency
The ability of a column to produce peaks with little/no band broadening
N (number of theoretical plates)
B term (van Deemter)
Longitudinal diffusion - natural tendency of molcules to distribute themselves in space to obtain constant conc in a system
The C term (van Deemter)
Resistance to mass transfer - related to kinetics of interactions with stationary phase
