five titrations. The effect of trace amounts of oxygen is clearly shown by this lower result.This procedure has been used for the determination of plutonium in high purity plutonium metal samples, alloys with noninterfering metals such as iron, and nitric or hydrochloric acid solutions. About 15 determinations may easily be performed per day. Using an automatic heating-cycle controller for the two evaporations with perchloric acid, the operator time per determination should be greatly reduced. After the 31, 1138 (1959).
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