Paper 86. A dilute chemical decontamination process for PWR and BWR applications

Dissociation quotients of oxalic acid in aqueous sodium chloride media to 175�C

“…The values of Qla and Q2a (Tables III and IV) were converted to the corresponding base forms (Tables III and IV) using the equilibrium tion (1) which is strictly isocoulombic. Moreover, in this form the equilibria exhibit relatively small heat capacity and volume changes,(34) thus simplifying the fitting equations, as well as the extrapolation to infinite dilution, and the computation of thermodynamic quantities.…”

“…In particular, oxalate forms stable complexes with actinides, so that it can be used to decontaminate radioactive components in the cooling systems of reactors. (1) Some actinides form insoluble oxalate salts rendering it useful in the decontamination of radioactive waste. (2) Moreover, there is substantial interest in the corrosion behavior of steels in oxalic acid solutions.…”

“…Although abundant data for equilibria (1) and (2) are available for temperatures between 0 and 50°C and for ionic strengths of S; 1m (Table I), the only data available at elevated temperatures are those of Nikolaeva and Antipina. (17) The latter study was based on measurements that extended to 90°C and were made in dilute solutions (ionic strength < 0.13m) in the absence of a supporting electrolyte.…”