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chemical thermodynamics of neptunium and plutonium - U.S. ...

chemical thermodynamics of neptunium and plutonium - U.S. ...

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12.1 Neptunium carbon compounds <strong>and</strong> complexes 287Table 12.9: Experimental equilibrium data for the <strong>neptunium</strong>(V) thiocyanate system.Method Ionic medium t ( ◦ C) log 10 β q(a) ReferenceNpO + 2 + SCN− Å NpO 2 SCN(aq)sp 5 M (NaClO 4 ) 25 0.86 [77CUI/MUS]pot 9 M (NaClO 4 ) 25 1.03 [77MUS/MAR]sp 9 M (NaClO 4 ) 25 1.23dis 2 M (H, Na)ClO 4 25 (0.32 ± 0.02) [79RAO/GUD]dis 8.5 M(H, Na)ClO 4 25 0.91 [81PAT/RAM]NpO + 2 + 2SCN− Å NpO 2 (SCN) − 2sp 5 M (NaClO 4 ) 25 1.05 [77CUI/MUS]pot 9 M (NaClO 4 ) 25 1.56 [77MUS/MAR]sp 9 M (NaClO 4 ) 25 1.91dis 8.5 M(H, Na)ClO 4 25 1.07 [81PAT/RAM]NpO + 2 + 3SCN− Å NpO 2 (SCN) 2−3sp 5 M (NaClO 4 ) 25 0.89 [77CUI/MUS]pot 9 M (NaClO 4 ) 25 1.60 [77MUS/MAR]sp 9 M (NaClO 4 ) 25 2.04NpO + 2 + 4SCN− Å NpO 2 (SCN) 3−4sp 5 M (NaClO 4 ) 25 −0.11 [77CUI/MUS]pot 9 M (NaClO 4 ) 25 1.56 [77MUS/MAR]sp 9 M (NaClO 4 ) 25 1.72NpO + 2 + 5SCN− Å NpO 2 (SCN) 4−5sp 9 M (NaClO 4 ) 25 0.46 [77MUS/MAR](a) log 10 β q refers to the equilibrium <strong>and</strong> the ionic strength given in the table.

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