DEIONIZED WATER

DEIONIZED WATER

• Deionized Water can be produced by starting with either Drinking Water or Purified Water, depending upon the monograph or testing procedures defined in the compendia.

• Deionized Water is produced by an ion-exchange process in which the cations and anions are replaced with H+ and OH− ions by use of ion-exchange resins.

• Similar to Distilled Water, Deionized Water is used primarily as a solvent for reagent preparation, but it is also specified in the execution of other aspects of tests, such as for transferring an analyte within a test procedure, as a calibration standard or analytical blank, and for test apparatus cleaning.

• Also, none of the cited uses of this water imply any needed purity attribute that can only be achieved by deionization.

• Therefore, water meeting the requirements for Purified Water that is derived by other means of purification could be equally suitable where Deionized Water is specified.

• It is the user’s responsibility to verify the suitability of Purified Water.