A Comparison of the gamma-Radiolysis of TODGA and T(EH)DGA Using UHPLC-ESI-MS Analysis

作者：Zarzana Christopher A; Groenewold Gary S; Mincher Bruce J^*; Mezyk Stephen P; Wilden Andreas; Schmidt Holger; Modolo Giuseppe; Wishart James F; Cook Andrew R

来源：Solvent Extraction and Ion Exchange, 2015, 33(5): 431-447.

DOI：10.1080/07366299.2015.1012885

Solutions of TODGA and T(EH)DGA in n-dodecane were subjected to gamma-irradiation in the presence and absence of an aqueous nitric acid phase and analyzed using UHPLC-ESI-MS to determine the rates of radiolytic decay of the two extractants, as well as to identify radiolysis products. The DGA concentrations decreased exponentially with increasing dose, and the measured degradation rate constants were uninfluenced by the presence or absence of an acidic aqueous phase, or by chemical variations in the alkyl side-chains. The DGA degradation was attributed to reactions of the dodecane radical cation, whose kinetics were measured for TODGA using picosecond electron pulse radiolysis to be k(2) = (9.72 +/- 1.10) x 10(9) M-1 s(-1). The identified radiolysis products suggest that the bonds most vulnerable to radiolytic attack are those in the diglycolamide center of these molecules and not on the side-chains.

• 出版日期2015-7-29