Lead oxide removal method
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United States of America Patent
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Jan 7, 1997
Grant Date -
N/A
app pub date -
Jul 31, 1995
filing date -
Jul 31, 1995
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Expired
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Abstract
The present invention provides a method of removing lead oxide from a surface having lead oxide deposited thereon. The method includes contacting the article containing lead contaminated with radioactive material with a decontamination composition comprising about 0.01 to 5 percent, by weight, of a reductant, about 0.01 to 5 percent, by weight, of a compound selected from the group consisting of citric acid, alkali metal and ammonium salts of citric acid and mixtures thereof; 1 to 15 percent, by weight, 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 1 percent, by weight, of a nonionic surfactant; 0 to 1 percent, by weight, of a dispersant; and 0 to 1 percent, by weight, of a corrosion inhibitor, and the balance water or other aqueous liquid.
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