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Ion exchange chromatography can be used in water treatment to remove impurities. The process involves passing water through a column packed with an ion exchange resin. The resin is made of a material that has a negative or positive charge, and it will exchange ions with the water. For example, if the resin is negatively charged, it will exchange anions (negatively charged ions) with the water. This process can be used to remove impurities such as chloride, sulfate, and nitrate from water.