Difference between de-ionised / de-mineralised water
Difference between de-ionised / de-mineralised water
(OP)
Ladies & Gentlemen,
Is there a difference between de-ionised water and de-mineralised water? Or are they both refer to the same quality water?
Regards,
Guru
http://www.americansanskrit.com/default.html
Is there a difference between de-ionised water and de-mineralised water? Or are they both refer to the same quality water?
Regards,
Guru
http://www.americansanskrit.com/default.html





RE: Difference between de-ionised / de-mineralised water
If distilled water is purified to take care of total viable count and bacteriological endotoxins, then it is called water for injection.
USP24 is the best reference to know different water qualities.
Regards,
Believe it or not : A cobweb with it's strands a pencil width, can catch hold of a concord. All questions directed to Discovery Channel.
RE: Difference between de-ionised / de-mineralised water
http://www.the-scientist.com/yr1998/june/profile1_98060...
RE: Difference between de-ionised / de-mineralised water
RE: Difference between de-ionised / de-mineralised water
1. de-mineralized: std. water softening process utilizing salts and resin beds.
2. de-ionized: processed through de-ionizing resin beds
3. distilled: processed through steam distillation and condensation
Hope this helps.
saxon
RE: Difference between de-ionised / de-mineralised water
It would appear that the term "demineralized water" is sometimes used to indicate water which has at least been "softened" by cation exchange, where either sodium or protons have been substituted for calcium, magnesium and other cations which can tend to form "mineral" deposits.
Deionized water, by definition, has had all ions other than H+ and OH- removed by means of both anion and cation exchange. The degree to which this has happened is often measured by conductivity as mentioned by previous posts.
RE: Difference between de-ionised / de-mineralised water
Distilled water (sometimes double- or triple-distilled) is obtained by "physical" means and this purifying method is considered the most energy-intensive of all. Deionized and/or demineralized water, are often produced by combinations of chemical (ion exchange), and physical (RO, filtration, etc.) means.
Depending on the purity desired demineralized waters may still contain traces of iron, silica, and even Ca hardness and organic material.
A water with more than 10 megohms resistivity (< 0.1 microsiemens conductivity) at 25oC is classified as "ultra pure". Sometimes degassing and sterilization by heat, UV irradiation, etc. are added.
RE: Difference between de-ionised / de-mineralised water
Regards,
Guru
http://www.americansanskrit.com/default.html
RE: Difference between de-ionised / de-mineralised water
If you want further reading about water sytems in various manufacuring setups, check this link for OsmonicsWater Purification Handbook. You can download it too.
http://www.osmonics.com/library/1154273-%20Lit-%20Pure%...
Regards,
Believe it or not : A cobweb with it's strands a pencil width, can catch hold of a concord. All questions directed to Discovery Channel.
RE: Difference between de-ionised / de-mineralised water
demineralised water is "softenned" by replacing undesirable dissolved minerals with table salt (NaCl) and ussually uses a mixed-bed anion/cation exchange resin;
in de-ionised water the mineral salt is replaced with the H+ ion in a cation bed and an OH- ion in an anion bed to make mineral-free water H+ + OH- > H20).
The purest water available is first demineralised, then distilled and finally de-ionised immediately before use in order to eliminate dissolved gasses (CO2, etc.)