# Commission Regulation (EC) No 2870/2000 of 19 December 2000 laying down Community reference methods for the analysis of spirits drinks, Division 6.5.3: UV detector settings:

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

the detector must be set at 370 nm to detect the presence of chalcones and then at 254 nm to detect glycyrrhizic acid.
Note:
the change of wavelength (from 370 nm to 254 nm) must be carried out 30 seconds before the beginning of the peak of elution of glycyrrhizic acid.

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Source: https://www.legislation.gov.uk/eur/2000/2870/annex/division/VII/division/6/division/6.5/division/6.5.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2000-2870/annex/division-VII/division-6/division-6.5/division-6.5.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.