# 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 5.2.8.2: Concentration of mercaptoacetic acid present in the sample

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

If ‘t’ represents mercaptoacetic acid:
let:
kt its response factor,
St its peak area.
If ‘c’ represents methyl octanoate:
let:
mc its mass (in mill grams) in the mixture,
Sc its peak area,
M the mass (in milligrams) of the initial test portion,
then the % (m/m) mercaptoacetic acid present in the sample is:
m c M × k t ×S t S c × 100

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Source: https://www.legislation.gov.uk/eudr/1983/514/annex/division/14/division/5/division/5.2/division/5.2.8/division/5.2.8.2 (the official version)
Page: https://openlegislation.uk/eu-directive-1983-514/annex/division-14/division-5/division-5.2/division-5.2.8/division-5.2.8.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.