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 languages (English, French and Russian), this part of ISO 6107 gives the equivalent terms and their definitions in the German language; these are published under the responsibility of the member bodies of Germany (DIN), Austria (ON) andSwitzerland (SNV). However, only the terms and definitions given in the official languages can be considered as ISO terms and definitions.