993. Radiation-induced decomposition of ion-exchange resins. Part I. Anion-exchange resins

Abstract

Hall and Streat. 5205 993. Radiation-induced Decomposition of lon-exchange Resins. Part I . Anion-exchange Resins.

Radiation-induced decomposition of anion exchange resins

“…Hall and Streat suggested several alternative formation channels for dimethylamine, methylamine and ammonia also found in the radiolysis of Deacidite FF [7]. Dimethylamine can be produced by the decomposition of weak-base groups initially present in the structure of the resin or formed due to the decay of the original quaternary group (cf.…”

“…The influence of the counter-ion on radiation stability of the resin was demonstrated by comparison of the radiolysis of the Cl À and OH À forms, and the Cl À resin was shown to be more resistant than OH À in the dose range up 350 kGy [34]. Hall et al were the first to successfully identify and quantitatively describe the decomposition products from resins as tertiary, secondary and primary amines and ammonia [7]. In their work, trimethylamine was found to be a major product in the c-radiolysis of Deacidite FF resin (in SO 2À 4 and NO À 3 form).…”

“…In Hall's and Streat's work spectrophotometric analysis was used for quantitative determination of trimethyl-, dimethyl-, and methyl-amines and ammonia following suitable derivatization [7]. Although all these analytic techniques seem to give reproducible and reliable results, the sample preparation is tedious and time-consuming.…”

“…A limited understanding of the radiation-induced decomposition mechanism of resins has been achieved in these works. In particular, the importance of deamination reaction in the radiolysis of quaternary ammonium resins has been shown [7][8][9][10].…”

Cementation of ILW ion exchange resins: Impact of sulfate ions released by radiolysis on hydrated matrix

“…This basic structure is functionalized with the addition of sulfonic groups, for cationic resins, or quaternary ammonium groups, for anionic ones. Under radiolysis process, anionic IER release soluble amino-compounds: trimethylamine mainly, but also dimethylamine, monomethylamine or ammonia [1][2][3], whereas soluble degradation products of cationic ones consist mainly in sulfate ions [2,3]. None of the amino-compounds released is known to have strong interaction with cement-based material, unlike sulfate ions which may strongly interact with cement [4][5][6][7].…”