# 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 5.1.1: Principle

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

The determination is performed by oxidation of the ‘-SH’ group with iodine in an acid medium according to the equation:
2 HOOC-CH2SH + I2 → (HOOC-CH2-S)2 + 2 I- + 2 H+

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Source: https://www.legislation.gov.uk/eudr/1983/514/annex/division/14/division/5/division/5.1/division/5.1.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1983-514/annex/division-14/division-5/division-5.1/division-5.1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.