This part of ISO 6107 defines terms used in certain fields of water quality characterization. NOTE In addition to the terms and definitions in the three official ISO lan-guages (English, French and Russian), this part of ISO 6107 gives the equivalent terms and their definitions in the German language; these have been included at the request of ISO Technical Committee ISO/TC 147 and are published under the responsibility of the member bodies of Germany (DIN), Austria (ON) and Switzerland (SNV). However, only the terms and defi-nitions in the official languages can be considered as ISO terms and defi-nitions.