prov:value
| - The exchangeable cations contemplated by the present invention include mono-, di, tri-, and tetravalent metal ions, particularly those of Groups I, II, and III of the Periodic Table, as set forth in Websters New Collegiate Dictionary, 1956 edition, page 626, such as barium, calcium, cerium, lithium, magnesium, potassium, sodium, zinc ions etc. and the like, and other cations, for example, hydrogen
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