| ion exchange chromatography |
In this case, water is passed through a charged resin column that has side chains that trap calcium, magnesium, and other heavy metal ions. In many laboratories, this method of purification has replaced distillation, as it provides a high volume of very pure water more quickly and with less energy use than other processes. Water purified in this way is called deionized water.
출처: www.thetexts.com/wikipedia/w/wa/water.html
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