O.O.O.O.O.O.[N+:7]([O-:10])([O-:9])=[O:8].[Zn+2:11].[N+:12]([O-:15])([O-:14])=[O:13]>O>[N+:7]([O-:10])([O-:9])=[O:8].[Zn+2:11].[N+:12]([O-:15])([O-:14])=[O:13]An aqueous solution of cupric nitrate was prepared by dissolving 130 kg of cupric nitrate trihydrate in 946 liters of deionized water, and the solution was maintained at about 30° C. An aqueous solution of zinc nitrate was prepared by dissolving 120 kg of zinc nitrate hexahydrate in 686 liters of deionized water, and the solution was maintained at about 30° C.
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