Water quality; determination of Kjeldahl nitrogen; method after mineralization with selenium (ISO 5663:1984); German version EN 25663:1993
Edition 1993-11

Water quality - Determination of phosphorus - Ammonium molybdate spectrometric method (ISO 6878:2004); German version EN ISO 6878:2004
Edition 2004-09

Ships and marine technolgy - Waste water treatment plants - Methods of sampling
Edition 2014-12

Characterization of sludges - Determination of Kjeldahl nitrogen; German version EN 13342:2000
Edition 2001-01

German standard methods for the examination of water, waste water and sludge; bio-assays (group L); surfactant biodegradation and elimination test for simulation of municipal waste water treatment plants (L 26)
Edition 1994-05

Soil quality - Determination of mineral nitrogen (nitrat and ammonium) in soil profiles (Nmin laboratory method)
Edition 2005-06

Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms (ISO 9509:2006); German version EN ISO 9509:2006
Edition 2006-10

Testing of solid fuels - Determination of fluorine content
Edition 2002-06

Irrigation - Hygienic concerns of irrigation water
Edition 1999-02

Copper and copper alloys - Pre-insulated copper tubes with solid covering; German version EN 13349:2002
Edition 2002-11