Abstract: Chlorine dioxide is generated very efficiently and safely by reducing a chlorate in a strong acid in the presence of a complex catalyst consisting of palladium(II) and an amino acid or an alkali metal salt thereof.

Abstract: Disclosed is a novel water-soluble thermosetting resin which has the property of providing paper with a nearly constant wet and dry strength over a wide pH range according to methods of wet-end additions or surface applications.

Abstract: Chlorine dioxide is generated very efficiently and safely by reducing a chlorate in a strong acid in the presence of a complex catalyst consisting of palladium (II) and a .beta.-diketone.

Abstract: From a ruthenium-containing substance, sparingly soluble in any of water, acid solutions and basic solutions, flaked off used metal electrodes comprising a substrate of a corrosion-resistant metal coated with ruthenium metal or a compound thereof, ruthenium is recovered in the form of metal or a compound thereof, soluble in such media as described hereabove, easily and with a high percent recovery by means of a combination of simple chemical procedures and also inexpensive chemicals and in a short period of time. The recovered ruthenium metal or compound thereof can be reused for recoating used metal electrodes and the like.

Abstract: After silver has been recovered from a photographic waste solution, said waste solution is electrolytically purified by adding chloride ion and carbonate ion or chloride ion, carbonate ion and iodide or iodate ion to said waste solution under limited pH, temperature, anode current density and current concentration conditions.

Abstract: A surface preparation process for use in recoating of used metallic electrodes coated with one or more platinum group metals, one or more iron group metals, or chemical compounds thereof, which comprises using said metallic electrode(s) as anode(s) and passing a current between said metallic electrode(s) and a steel cathode(s) in an aqueous solution of sulfuric acid, nitric acid, perchloric acid, salts thereof, chlorates or persulfates, or a mixture solution thereof, and then dipping said metallic electrode(s) into an aqueous solution of hydrofluoric acid or hydrochloric acid.