Inlet Systems
Split/splitless capillary inlet
116
Solvent
Boiling Point
(
C)
Suggested Initial Oven
Temperature Range ( C)
Diethyl Ether 36 10 to 25
n-Pentane 36 10 to 25
Methylene Chloride 40 10 to 30
Carbon Disulfide 46 10 to 35
Chloroform* 61 25 to 50
Methanol* 65 35 to 55
n-Hexane 69 40 to 60
Ethyl Acetate* 77 45 to 65
Acetonitrile 82 50 to 70
n-Heptane 98 70 to 90
i-Octane 99 70 to 90
Toluene 111 80 to 100
* Should be used only with cross-linked stationary phases.
Table 6-2. Some Common Solvents: Suggested Initial Oven
Temperatures to Use the Solvent Effect
The best solvent for a given application is found by trial and error,
depending upon sample solubility and volatility, column polarity and type
of stationary phase, and detector selectivity/sensitivity.
Note that, because of the solvent effect, retention times for the same
components, but dissolved in different solvents, may be different: the
solvent, once chosen for a particular application, should be used
throughout.
Cold trapping
Cold trapping is a second mode of reconcentration: where column
temperature is low enough, vaporized components may condense into the
liquid phase.
