Abstract
With DTPA present in excess, small amounts of uranium (100–200 μg) can be reduced quantitatively to the quadrivalent state in a Jones reductor (5% amalgamated Zn powder, 50 mesh). The excess of DTPA is back-titrated photometrically with thorium, with Semi-Xylenol Orange as the indicator. The accuracy is ± 0.2 μ g at the 200-μ g level. Metals forming complexes with DTPA at pH 2 interfere.
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