Deionized Water vs Distilled Water
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Although Distilled and Deionized Water are both very pure types of water, when considering the merits of Deionized Water vs Distilled Water, it is important to recognise that they are produced in two very different ways. There are a number of factors to take into consideratiion when deciding on the merits of using Deionized Water vs Distilled Water.
Distilled Water is produced by a method known as distillation. Here water is heated in a vessel until water vapour appears. This water vapour is then collected in a separate vessel, cooled and condensed. As it condenses it returns to liquid state and this resultant liquid is known as Distilled Water. Distilled Water is a particularly high purity of water with almost no trace elements, minerals or other impurities.
Deionized Water is produced by means of deionization where water is passed through porous beds of ion exchange resin. The resin resembles ‘wet sand’ and it is made up of hundreds of tiny balls which resemble tiny beads of resin. There are positive ions called ‘anions’ and negative ions called ‘cations’. As water passes through these porous beds, the ions in the water exchange with the ions in the resin bed and Deionized Water is produced.
Deionized Water is also commonly known as Demineralized Water, Demin Water, DI Water or DIW. The words ‘Deionized’ and ‘Demineralized’ are often spelt with a letter ‘s’ as in Deionise, Deionised, Deionisation, Demineralise, Demineralised and Demineralisation. In effect, all these products are the same material when referring to Distilled or Deionized Water.
When weighing up the benefits of using Deionized Water vs Distilled Water, it is important to remember that due to the different methods of production, each type of water varies considerably in price, with Deionized Water being much less expensive that Distilled Water. This is because the process of distillation takes longer to produce the finished water. In practical terms, it is often possible to use either Deionized Water or Distilled Water for some applications so it is worth checking with your specialist water supplier to confirm which grade of water you need.
Deionized Water purity can meet certain recognised international standards such as those set down by the USP (United States Pharmacopiea), the JP (the Japanese Pharmacopiea), the BP (British Pharmcopiea) and the EP (European Pharmacopiea). It is possible to further purify Deionized Water by passing it through a second bed of ions exchange resins. The resultant water is called Double Deionized Water or Double Demineralized Water. It is also sometimes called Double Polished Water. This water has a conductivity level of less than 0.1 microsiemens per centrimetre.
If you are at all unsure about any aspects of Deionized Water vs Distilled Water, you should always contact your Deionized Water supplier to clarify which type of water you should be using. This could save you a great deal of money as Distilled Water is always more expensive to product than Deionized Water, and therefore Distiled Water is always more expensive to purchase then Diionized Water.
http://www.deionized-water.co.uk/deionized-water-vs-distilled-water | Saved Friday, November 18th, 2011 - 4:30 AM