WHAT IS WATER DEIONIZATION?
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What is Deionized Water?
Deionized water (DI water) is purified water that has undergone complete removal of its ionic constituents. These ions, which may exist as positively charged cations or negatively charged anions, represent undesirable impurities in many technical applications where high-purity water is required.
What is Deionization?
Deionization, alternatively termed demineralization, refers to the purification process that eliminates ionic species from aqueous solutions.
The conventional methodology employs specialized ion-exchange resins that undergo reversible chemical reactions - substituting undesirable positive ions with hydrogen ions (H⁺) and negative ions with hydroxide ions (OH⁻) through stoichiometric exchange mechanisms. This ionic substitution ultimately yields molecular water (H₂O) of high purity.
How is Deionized Water Measured?
The purity of deionized water is quantitatively assessed through two key electrical parameters: conductivity and resistivity. These complementary measurements evaluate the water's capacity to transmit (conductivity) or impede (resistivity) electric current, with values being inversely related.
Given that dissolved ions facilitate electrical conduction, properly deionized water - characterized by minimal ionic content - exhibits exceptionally low conductivity alongside correspondingly high resistivity.
