Deionized water

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Water which has had all charged particles removed. Deionized water (DI water) is produced using a two-stage process that first passes water through an ion exchange resin to replace any dissolved cations with hydrogen; the resultant acids are then adsorbed in a second column that contains an acid scavenger. Another type of filtration, called reverse osmosis, uses pressure to force the small water molecules through a membrane while trapping larger minerals and contaminants.

Soaking any material in DI water will readily dissolve or leach any salts or ions.

Synonyms and Related Terms

DI water; de-ionized water; demineralized water; deionised water (Br.); agua desionizada (Esp.)

Physical and Chemical Properties

  • Normal deionized water: resistance=1 mega-ohm/cm
  • Ultra-pure deionized water: resistance=18 mega-ohm/cm

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
  • Conservation termlist: