The Determination of Plutonium by (Ethylene dinitrilo)-tetraacetic Acid Titration.

Abstract

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.

GEL-ADDITION PROCESS CHEMICAL STUDIES. Quarterly Progress Report No. 1, July--September 1966.

“…This procedure was apparently first applied to plutonium by Brown, Rogers, Mershad, and Amos, and has been used for assaying incoming Pu(IV) nitrate solution. 15 The formula of the complex was reported by Milyukova and Nemodruk. In practice, the capacitor voltage is used directly to obtain total sample mass from an empirical calibration curve.…”

Indirect Determination of Thorium with (Ethylene-dinitrilo)tetraacetic Acid.

“…A previous paper described an indirect EDTA procedure for the determination of plutonium (6). Plutonium and impurities are titrated at 100°C.…”

“…Analyses performed in triplicate. 6 Hydroxylamine hydrochloride, 0.5 gram, added prior to direct titration. the direct and the indirect procedures.…”

“…Since their discovery by Wohler (6) in 1823, the sodium tungsten bronzes have been the object of many scientific investigations. Their electrical properties have received particular attention, especially in the last decade or so.…”