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A method for the simultaneous separation of trace levels of germanium, arsenic, antimony, and selenium as Ge(OH)gO~, As043~, Sb043", and Se032~respectively, from an acidic aqueous solution Is described. The anionic species are concentrated by adsorbing colloid flotation (ACF) using sodium lauryl sulfate and an Iron(III) hydroxide collector. Optimum recovery of the elements Is achieved at pH 5.5. The recovery of the elements Is as follows: Ge, 86.6 ± 2.3%; As, 85.3 ± 3.2%; Sb, 95.7 ± 2.3%; Se, 98.4 ± 2.1%. Flotation of the desired species Is achieved In less than 5 min using an air LITERATURE CITED

and Pb in the nodules were determined, and the accuracy of the determinations was verified independently by flame atomic absorption and emission techniques. Thin sample targets on Nuclepore filter disks backed with Kapton were used with I-MeV protons for the low-energy region (0-8 keV) and 2-MeV protons and a 0.004-in. AI filter for the high-energy region (5-35 keV) of the X-ray spectrum. X-ray yield data were obtained for elements from Na to U (11 < 2 < 92), wlth standards of 99.999 YO purity and the thin target technique.

A procedure is described for the separation from seawater of uranium present as the stable tricarbonatouranyl anion by an adsorbing colloid flotation technique which utilizes a collector-surfactant-air system. At pH 6.7 ± 0.1 the uranium is adsorbed effectively on the positively charged ferric hydroxide collector. Upon addition of the anionic surfactant, . sodium dodecyl sulfate, and the bubbling of air through the seawater, the colloidal particulates of ferric hydroxide enriched with uranium by absorption are floated within 2-3 minutes to the surface as a stable froth which is easily removed. Uranium was analyzed

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