| http://www.w3.org/ns/prov#value | - Each batch of gel was used for the treatment of sixteen lots of perborate solution, without regeneration, and the stability of the first and sixteenth solutions treated by both types of material was compared by the same method as was used in Example 1, In the above examples instead of silica gel we could have used alumina gel, stannic oxide gel, nickel, oxide gel, or the gels derived from the oxid
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