Inlet Systems

Split/splitless capillary inlet

Figure 6-9

C Low Volatility Solute

NeedleC High Volatility Solute

(a)

Carrier Gas

Column

(b)

(c)

(d)

The Solvent Effect

The solvent effect is described in great detail elsewhere: see Grob, K. and Grob, K., Jr., Journal of Chromatography, 94, page 53 (1974); Grob, K. and Grob, G., Chromatographia, 5, page 3 (1972).

To reconcentrate sample components via the solvent effect, oven temperature must be low enough so solvent remains at the head of the column for a sufficiently long time period. A good guideline is to have the column 10 to 30^C below the solvent boiling point. Table 6•2gives boiling points for some common solvents, along with suggested initial oven temperature ranges to use the solvent effect efficiently.

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