| http://www.w3.org/ns/prov#value | - If a multivalent ion such as calcium, strontium, or aluminum is exchanged for the alkali metal ion, the liquid, water-soluble polysaccharide molecules are cross-linked to form a water-insoluble, shape-retaining gel which can be resolubilized on removal of the ions by ion exchange or via a suquestering agent.
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