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Codified version
Directive 2006/44/EC of the European Parliament and of the Council of 6 September 2006 on the quality of fresh waters needing protection or improvement in order to support fish life (Codified version) (Text with EEA relevance) · European Union

10. Non-ionised ammonia (mg/l NH_(3)) ≤ 0,005 ≤ 0,025 ≤ 0,005 ≤ 0,025 Molecular absorption spectrophotometry using indophenol blue or Nessler's method associated with pH and temperature determination Monthly Values for non-ionised ammonia may be exceeded in the form of minor peaks in the daytime

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Source: EUR-Lex (Cellar) · retrieved 2026-10-13 · Text as adopted (Official Journal); later amendments are not incorporated in this text.