Division 7 GAS CHROMATOGRAPHY

The column must yield a resolution ‘R’ equal to, or better than, 1,5, where:

let: $\mathrm{R\; =\; 2}\frac{\mathrm{d\text{'}}\left(r_2{\mathrm{-\; r}}_1\right)}{W_1{\mathrm{+\; W}}_2}$

r₁ and r₂

retention times (in minutes),

W₁ and W₂

peak widths at half height (in millimetres),

d'

the chart speed (in millimetres per minute).

The following gas chromatographic conditions have been found suitable:

Column

stainless steel.

Length

1,7 m.

Diameter

3 mm.

Support:

chromosorb

WAW

sieve analysis

80 to 100 mesh.

Stationary phase

10 % OV 17.

Temperatures:

column

280 ^oC,

injector

280 ^oC,

detector

280 ^oC.

Carrier gas: oxygen-free nitrogen.

Pressure

2,3 bar.

Flow

30 ml/min.