# Commission Regulation (EU) No 544/2011 of 10 June 2011 implementing Regulation (EC) No 1107/2009 of the European Parliament and of the Council as regards the data requirements for active substances (Text with EEA relevance) (repealed), Division 2.9.3

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

Where necessary to investigate direct phototrans-formation, the quantum yield of direct photodegradation in water must be determined and reported, together with calculations to estimate theoretical lifetime of the active substance in the top layer of aqueous systems and the real lifetime of the substance.
The method is described in the FAO Revised Guidelines on Environmental Criteria for the Registration of Pesticides.

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Source: https://www.legislation.gov.uk/eur/2011/544/annex/part/A/division/2/division/2.9/division/2.9.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-544/annex/part-A/division-2/division-2.9/division-2.9.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.