Water quality - Sampling - Part 15: Guidance on the preservation and handling of sludge and sediment samples (ISO 5667-15:2009); German Version EN ISO 5667-15:2009
Edition 2010-01

Water quality - Determination of nitrogen - Part 1: Method using oxidative digestion with peroxodisulfate (ISO 11905-1:1997); German version EN ISO 11905-1:1998
Edition 1998-08

Water quality - Sampling - Part 15: Preservation and handling of samples of sludge, sediment and suspended matter (ISO/DIS 5667-15:2025); German and English version prEN ISO 5667-15:2025
Edition 2025-08

Water quality - Guidance standard on survey and monitoring freshwater mussel populations and their environment; German and English version prEN 18161:2025
Edition 2025-03