Determination of plutonium oxidation states in dilute nitric acid by complementary tristimulus colorimetry.
The preparation of reference standards for use in complementary tristimulus colorimetry for plutonium is described. Plutonium(III) and (VI) are prepared by hydrazine reduction and silver(II) oxidation, respectively, of plutonium(IV). Plutonium(V) is prepared by reduction of plutonium(VI) with ascorbic or sulphurous acid. A method for computerizing tristimulus colorimetry is presented, and the technique is extended to three dimensions ("quadristimulus colorimetry").
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Monsanto Research Corporation, Mound Laboratory(1) Miamisburg, Ohio, U.S.A.