# Commission Regulation (EU) No 283/2013 of 1 March 2013 setting out the data requirements for active substances, in accordance with Regulation (EC) No 1107/2009 of the European Parliament and of the Council concerning the placing of plant protection products on the market (Text with EEA relevance), Division 2.4: Spectra (UV/VIS, IR, NMR, MS), molar extinction at relevant wavelengths, optical purity

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

The following spectra, including a table of signal characteristics needed for interpretation, shall be determined and reported: ultraviolet/visible (UV/VIS), infrared (IR), nuclear magnetic resonance (NMR) and mass spectra (MS) of purified active substance.
Molar extinction at relevant wavelengths shall be determined and reported (ε in L × mol–1 × cm–1). Relevant wavelengths include all maxima in the UV/visible absorption spectrum, as well as the wavelength range of 290-700 nm.
In the case of active substances which are resolved optical isomers, the optical purity shall be measured and reported.
Where necessary for the identification of the impurities considered to be of toxicological, ecotoxicological or environmental significance, the UV/visible absorption spectra, IR, NMR and MS spectra, shall be determined and reported.

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Source: https://www.legislation.gov.uk/eur/2013/283/annex/section/2/division/2.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-283/annex/section-2/division-2.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.