# Commission Directive 2004/73/EC of 29 April 2004 adapting to technical progress for the twenty-ninth time Council Directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (Text with EEA relevance), Division 1.5: PRINCIPLE OF THE TEST METHOD

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

The method described in this test employs an aerobic and an anaerobic aquatic sediment (see Annex 1} system which allows:
(i) the measurement of the transformation rate of the test substance in a water-sediment system,
(ii) the measurement of the transformation rate of the test substance in the sediment,
(iii) the measurement of the mineralisation rate of the test substance and /or its transformation products (when 14C-labelled test substance is used),
(iv) the identification and quantification of transformation products in water and sediment phases including mass balance (when labelled test substance is used),
(v) the measurement of the distribution of the test substance and its transformation products between the two phases during a period of incubation in the dark (to avoid, for example, algal blooms) at constant temperature. Half-lives, DT50, DT75 and DT90 values are determined where the data warrant, but should not be extrapolated far past the experimental period (see section 1.2).
At least two sediments and their associated waters are required for both the aerobic and the anaerobic studies respectively (7). However, there may be cases where more than two aquatic sediments should be used, for example, for a chemical that may be present in freshwater and/or marine environments.

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Source: https://www.legislation.gov.uk/eudr/2004/73/annex/2I/division/C.24/division/1/division/1.5 (the official version)
Page: https://openlegislation.uk/eu-directive-2004-73/annex-2I/division-C.24/division-1/division-1.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.