A Study of the γ-Radiolysis of N,N-Didodecyl-N′,N′-Dioctyldiglycolamide Using UHPLC-ESI-MS Analysis

ABSTRACT

Solutions of N,N-didodecyl-N′,N′-dioctyldiglycolamide in n-dodecane were subjected to γ-irradiation in the presence and absence of both an aqueous nitric acid phase and air sparging. The solutions were analyzed using ultra-high-performance liquid chromatography-electrospray ionization-mass spectrometry (UHPLC-ESI-MS) to determine the rates of radiolytic decay of the extractant as well as to identify radiolysis products. The DGA concentration decreased exponentially with increasing dose, and the measured degradation rate constants were uninfluenced by the presence or absence of acidic aqueous phase, or by air sparging. The identified radiolysis products suggest that the bonds most vulnerable to radiolytic attack are those in the diglycolamide center of these molecules and not in the side chains.

KEYWORDS:

• Diglycolamide
• UHPLC-MS
• radiolysis
• D3DODGA
• radiation chemistry

Funding

The gamma irradiation and UHPLC-ESI-MS experiments performed at Idaho National Laboratory were supported by the US Department of Energy (US-DOE), Office of Nuclear Energy, under the Fuel Cycle R&D Program, Idaho Operations Office Contract DE-AC07-05ID14517. Additional financial support for this research was provided by the European Commission (projects SACSESS – contract number FP7-Fission-2012-323-282).

Supplemental Material

Supplemental data for this article can be accessed at http://dx.doi.org/10.1080/07366299.2016.1212540.

Additional information

Funding

The gamma irradiation and UHPLC-ESI-MS experiments performed at Idaho National Laboratory were supported by the US Department of Energy (US-DOE), Office of Nuclear Energy, under the Fuel Cycle R&D Program, Idaho Operations Office Contract DE-AC07-05ID14517. Additional financial support for this research was provided by the European Commission (projects SACSESS – contract number FP7-Fission-2012-323-282).