# 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 1.2: DEFINITIONS

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

Nitrogen transformation: is the ultimate degradation by microorganisms of nitrogen-containing organic matter, via the process of ammonification and nitrification, to the respective inorganic end-product nitrate.
ECx (Effective Concentration): is the concentration of the test substance in soil that results in a x percent inhibition of nitrogen transformation to nitrate.
EC50 (Median Effective Concentration): is the concentration of the test substance in soil that results in a 50 percent (50%) inhibition of nitrogen transformation to nitrate.

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Source: https://www.legislation.gov.uk/eudr/2004/73/annex/2I/division/C.21/division/1/division/1.2 (the official version)
Page: https://openlegislation.uk/eu-directive-2004-73/annex-2I/division-C.21/division-1/division-1.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.