Water Types

Pure water Water which has been produced using → Ion exchangers, reverse osmosis or distillation, but which still contains a residue of certain ions. Purified water (“aqua purificata”) prepared according to the → DAB (and used in many pharmaceutical products) belongs to this category. Its specific conductivity at 25°C lies between 1 µS/cm and 50 µS/cm. Water for injection (“aqua ad injectabilia”) used in hypodermic syringes is categorised in the → DBA as a “cleaner” pure water. It is used as a solvent and as a fluid for diluting those medicines which can be applied by injection or by infusion. Sterility is a prerequisite. Deionized water Water which is fully salt-free (deionized). It is produced by the use of ion exchangers or by distillation. The quality of the resulting product is codified by various standards (e. g. DIN, ISO 3696). No ionogenic contents (= anions and cations) may be present. The specific conductivity at 25 °C lies between 0.1 µS/cm and 1 µS/cm Ultrapure water Water of the very highest purity. It is made from distilled water using supplementary ion-exchange techniques, → Active carbon and other absorbing materials. It contains only the slightest traces of organic compounds, micro-organisms and electrolytes. The specific conductivity at 25 °C is less than 0.1 µS/cm....