The standard specifies the requirements and corresponding test methods for three grades of water for laboratory use for the analysis of inorganic chemicals.
DIN ISO 3696:1991 history
1991DIN ISO 3696:1991-06 Water for analytical laboratory use; specification and test methods; identical with ISO 3696:1987
1991DIN ISO 3696:1991 Water for analytical laboratory use; specification and test methods; identical with ISO 3696:1987