The formal potentials of the (ΜΟ? + /ΜΟ^) and (M 4+ /M 3+ ) couples (where Μ = Np or Pu) were determined in GO" medium of varying ionic strength. These data have been interpreted by using the Brönsted-Guggenheim-Scatchard specific ionic interaction theory to give the following standard potentials and interaction coefficients, Δε = e (Ox, ClOJ -e (Red, C10 4 ), at 20°C: E" (NpOj + /NpOj) = 1.162 ±0.011 V/NHE; Ae = 0.21 ±0.03 kg/mole E° (PuOj + / PuOj") = 0.954±0.010 V/NHE; Δε = 0.29±0.03 kg/mole £·°(Νρ 4 + /Νρ 3+ ) =0.210±0.010 V/NHE; Δε = 0.33 ±0.03 kg/mole E" (Pu 4 + /Pu 3+ ) = 1.015 ±0.010 V/NHE; Δε = 0.54±0.03 kg/moleThe published data on the neptunium and plutonium redox systems are reviewed, discussed and reinterpreted.
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