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

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18.2 Aqueous <strong>plutonium</strong> group 17 (halogen) complexes 381Table 18.4: Experimental equilibrium data for the <strong>plutonium</strong>(IV) chloride system.Method Ionic medium t ( ◦ C) log 10 β (a)qPu 4+ + Cl − Å PuCl 3+Referenceemf 1 M H(Cl,ClO 4 ) 25 0.32 (c) [51RAB/LEM]emf 1 M H(Cl,ClO 4 ) 25 (0.31±0.30) (b,c) [55RAB/COW]2MH(Cl,ClO 4 ) 25 −0.23cix 4 M H(Cl,ClO 4 ) 20 (0.15±0.30) (b) [60GRE/NOR]dis 4 M H(Cl,ClO 4 ) 25 (0.30±0.20) (b) [66DAN/ORL]dis 2 M H(Cl,ClO 4 ) 25 (0.15±0.20) (b) [76BAG/RAM2]pol 5.4 M (H,Na)(Cl,ClO 4 ) 25 (0.13 ± 0.02) [92MAR/ESS] (d)sp 3 M H(Cl,ClO 4 ) 25 (0.20±0.20) (b) [94GIF]4MH(Cl,ClO 4 ) 25 (0.25±0.20) (b)Pu 4+ + 2Cl − Å PuCl 2+2cix 4 M H(Cl,ClO 4 ) 20 (0.08 ± 0.07) [60GRE/NOR]dis 4 M H(Cl,ClO 4 ) 25 −(0.80 ± 0.08) [66DAN/ORL]dis 2 M H(Cl,ClO 4 ) 25 −(0.64 ± 0.11) [76BAG/RAM2]pol 5.4 M (H,Na)(Cl,ClO 4 ) 25 −(1.5 ± 0.2) [92MAR/ESS] (d)sp 3 M H(Cl,ClO 4 ) 25 −(0.36±0.18) (e) [94GIF]4MH(Cl,ClO 4 ) 25 −(0.36±0.20) (e)Pu 4+ + 3Cl − Å PuCl + 3cix 4 M H(Cl,ClO 4 ) 20 −(1.0 ± 0.4) [60GRE/NOR]pol 5.4 M (H,Na)(Cl,ClO 4 ) 25 −(1.7 ± 0.3) [92MAR/ESS] (d)(a) Refers to the value reported for the reactions indicated, the ionic strength <strong>and</strong> temperaturegiven in the table.(b) The uncertainties are estimated in this review, cf. Appendix A.(c) These values were reported as −0.24 [51RAB/LEM] <strong>and</strong>−0.25 [55RAB/COW], respectively,<strong>and</strong> are corrected in this review for the formation <strong>of</strong> PuCl 2+ , cf. the[55RAB/COW] entry in Appendix A.(d) The same values <strong>of</strong> the same study were published in the same year in a summary paperby Bisch<strong>of</strong>f et al. [92BIS/KRA].(e) Reported as stepwise constants: log 10 K 2 (I = 3 M) = −(0.56 ± 0.16) <strong>and</strong>log 10 K 2 (I = 4M) =−(0.61 ± 0.18) (cf. Appendix A).

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