Activation Analysis of Arsenic, Copper, and Antimony in Sea Water

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Arsenic, copper, and antimony in sea water were determined by the thermal neutron activation analysis. Convenient pre- and post-irradiation procedures were proposed and some samples were analyzed. Arsenic, copper, and antimony were collected by the cocrystallization with thionalide, and were irradiated for 30 min in the neutron flux of 2×1013 n/cm2/sec. After the thionalide complex was decomposed with nitric acid, the copper and antimony were separated from the arsenic by precipitating with oxine, and the arsenic in the filtrate was coprecipitated with ferric hydroxide. Gamma-ray spectra were obtained and the decays of the 0.44–0.67 MeV photo peak of 64Cu plus 122Sb and the 0.55 MeV peak of 76As were followed. The arsenic, copper, and antimony contents in sea water were estimated to be 1.12–1.71 μg As/l, 1.49–3.35 μg Cu/l, and 0.22–0.57 μg Sb/l.
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