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US 5,489,735 AGranted
Decontamination composition for removing norms and method utilizing the same
OwnerThomas F. D'Muhala, William H. Wadlininventors
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OwnerThomas F. D'Muhala, William H. Wadlininventors
Estimating the term…
A decontamination composition comprises 40 to 60 percent of a compound selected from the group consisting of oxalic acid, alkali metal and ammonium salts of oxalic acid and mixtures thereof; 5 to 20 percent of a compound selected from the group consisting of citric acid, alkali metal and ammonium salts of citric acid and mixtures thereof; 20 to 40 percent of a compound selected from the group consisting of polyaminocarboxylic acid, alkali metal and ammonium salts of polyaminocarboxylic acid and the combination of a polyaminocarboxylic acid and a neutralizing compound, and mixtures thereof; 0 to 2 percent of a nonionic surfactant; about 0 to 2 percent of a dispersant; and about 0 to 2 percent of a corrosion inhibitor. The present invention also relates to a method of decontaminating a surface whereby contaminants in the form of NORMs are removed therefrom.
A composition suitable for decontaminating a surface contaminated with NORM, the composition comprising about 40 to 60 percent of a compound selected from the group consisting of oxalic acid, alkali metal and ammonium salts of oxalic acid and mixtures thereof;
A method of decontaminating a surface whereby NORM contaminants are removed from the surface, the method comprising contacting the surface surface with a decontamination composition comprising about 40 to 60 percent of a compound selected from the group consisting of oxalic acid, alkali metal and ammonium salts of oxalic acid and mixtures thereof, about 5 to 20 percent of a compound selected from the group consisting of citric acid, alkali metal and ammonium salts of citric acid and the combination of a polyaminocarboxylic acid and a neutralizing amine, and mixtures thereof, about 20 to 40 percent of a compound selected from the group consisting of polyaminocarboxylic acid, alkali metal and ammonium salts of polyaminocarboxylic acid and mixtures thereof, about 0 to 2 percent of a nonionic surfactant;
A method of decontaminating a metal surface having a NORM-contamination film containing radon and its decay products thereon whereby the NORM contaminants are removed by contacting the metal surface with a decontamination composition comprising about 40 to 60 percent of a compound selected from the group consisting of oxalic acid, alkali metal and ammonium salts of oxalic acid and mixtures thereof, about 5 to 20 percent of a compound selected from the group consisting of citric acid, alkali metal and ammonium salts of citric acid and the combination of a polyaminocarboxylic acid and a neutralizing amine, and mixtures thereof, about 20 to 40 percent of a compound selected from the group consisting of polyaminocarboxylic acid, alkali metal and ammonium salts of polyaminocarboxylic acid and mixtures thereof, about 0 to 2 percent of a nonionic surfactant;
Dependencies are inferred from the claim text.