b A direct and an indirect (ethylene dinitri1o)tetraacetic acid (EDTA) titration for the determination of plutonium has been developed. A solution containing from 8 to 40 mg. of plutonium is buffered between pH 2.5 and 3.0, heated to boiling, and titrated with EDTA to a copper-l-(2-pyrid yla zo)-2-na phthol ( CU-PAN) end point. The indirect procedure is a continuation of the direct procedure. Ammonium fluoride solution, buffered at pH 3, is added to the titrated sample. Fluoride ions stoichiometrically demask EDTA from the plutonium chelate. The uncomplexed EDTA is titrated with standard copper solution to a PAN end point, For samples containing between 8 and 40 mg. of plutonium, the mean error of the direct method was less than fO.1 mg., and the mean error of the indirect method was less than f0.2 mg. The standard deviation of 10 titrations performed on samples containing 14.0 mg. of plutonium was h0.08 for both the direct and the indirect methods. The indirect procedure is relatively free from interfering anions and cations.

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Monsanto 1 AbstractAn improved method for packaging tritiated waste liquids for burial is described and evaluated. The packaging procedure virtually eliminates tritium exposures to personnel and the environment. The package is shown to be more than adequate for burial of tritiated liquid wastes. Calculations based on tests of the package indicate that the maximum tritium released during 85 yr (seven half-lives of tritium) burial would be 0.002% of the total tritium contained in the package or approximately 1.6 Ci from the 70,000 Ci (recommended maximum) package.

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