# Third Commission Directive of 27 September 1983 on the approximation of the laws of the Member States relating to methods of analysis necessary for checking the composition of cosmetic products (83/514/EEC), Division 5.3.3.1: Column

Extent: E+W+S+N.I.

This is in two parts, the first containing didecyl phthalate on Gas Chrom Q as packing, the second having Ucon 50 HB 280X on Gas Chrom Q as packing. The prepared combined column must yield a resolution ‘R’ equal to, or better than, 1,5, where:
R= 2 d' r 2 - r 1 W 1 + W 2
let:
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).
As examples the following two parts yield the required resolution:
Column A:
Material: stainless steel.
Length: 1,5 m.
Diameter: 3 mm.
Packing: 20 % didecyl phthalate on Gas Chrom Q (100 to 120 mesh).
Column B:
Materia: stainless steel.
Length: 1,5 m.
Diameter: 3 mm.
Packing: 20 % Ucon 50 HB 280X on Gas Chrom Q (100 to 120 mesh).

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Source: https://www.legislation.gov.uk/eudr/1983/514/annex/division/13/division/5/division/5.3/division/5.3.3/division/5.3.3.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1983-514/annex/division-13/division-5/division-5.3/division-5.3.3/division-5.3.3.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.