What Is The Proper Deionized Water Conductivity Range?
Deionized water is important in cleaning because it contains very small concentrations of ions and thus it can be used to clear contaminants and undesirable compounds. Most water will have at least some concentrations of cations and anions which could disrupt an experiment or an industrial process. As a result, deionized water is commonly used in labs for cleaning and removing contaminants in both research and industry contexts. Water can be considered deionized when it is below a certain conductivity range which makes it important to know the proper conductivity range in order to make deionized water that is effective in its use.
Problem of impurities in water
Water in natural settings will always have impurities. Water in the oceans, rivers, or ground water will interact with rocks and minerals and will pick up ions from the surrounding environment.
These ions can complicate laboratory procedures both in industrial contexts and in research contexts. Water, however, is still very important in science and industry, so a way must be found to ensure that this does not interfere with laboratory and industrial processes.
Deionized water grades
According to International Organization for Standardization (ISO) standard 3696, there are three grades of de-ionized water. These are the conductivity values for each.
Grade 1: 10-7 S/m
Grade 2: 10-6 S/m
Grade 3: 5 • 10-6 S/m
The de-ionized water increases in quality with lower conductivities though higher grade de-ionized (DI) water will be more expensive and will take more time and energy to produce.
In conclusion, the proper conductivity range for DI water is typically ≤ 5 • 10-6 S/m. Both cost and suitability are factors are important. If contaminants can be removed from a lab with fairly low grade, in expensive DI water, it would be better to do so especially since DI water is very susceptible to being contaminated and has to be very carefully sealed off from any possible source of contamination prior to use.
For example, high quality de-ionized water would not be useful for washing a lab bench because, as soon as it was exposed to the air, it would be contaminated and no longer have the special properties of high grade de-ionized water. It would be no better than tap or distilled water or de-ionized water of a lower grade. At that point, you might as well just use tap or distilled water in order to cut down on expenses.
If a facility does not require very high-grade DI water to clean the facility, it might be better to simply use lower grade DI water that has more contaminants but still does the job to save money. High grade DI water should only be used if necessary.
Therefore, best conductivity range would also depend on the cost needed to distill higher grades of DI water and how often these higher grades need to be used. As a result, there is no proper conductivity range for all cases as long as the conductivity is below the threshold for water to be considered de-ionized.
Deionized water is water where all of the impurities have been removed by absorbing the anions and cations with a special resin to create a highly purified form of water. It is purer than tap water or distilled water and is in demand for use in cleaning laboratories. The conductivity range of deionized water generally has to be very low. The maximum conductivity range for deionized water is ≤ 5 • 10-6 .
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