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The stability of Np(VI) in 5–200 mM iminodiacetic acid (H2IDA) solutions at 23.5–55°С was studied by spectrophotometry. In a solution with pH 2 and excess Np(VI), 1 mol of H2IDA reduces 2 mol of Np(VI) to Np(V). In 1 and 0.5 M HClO4 solutions containing 200 mM H2IDA and 1 mM Np(VI), no more than 36 and 65% of Np(VI), respectively, is reduced at 44.5°С. Complete reduction of Np(VI) is observed in solutions...
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