Determination of N, N’, N’’-tris(3,7-dimethyloctyl)guanidine (TiDG) in Cesium Extraction Solvent

Abstract

Several analytical methods were evaluated for determining the concentration of N,N’,N”-tris(3,7-dimethyloctyl)guanidine (TiDG) in a cesium extraction solvent. Of the methods evaluated, non-aqueous titration and ¹H NMR were shown to be successful at quantifying the amount of TiDG present in both a pure solvent extraction system, and a blended system containing an additional base, trioctylamine.

Keywords:

• titration
• ¹H NMR
• ³⁶Cl radiocounting
• N,N’,N”-tris(3,7-dimethyloctyl)guanidine (TiDG)
• modular caustic-side solvent extraction (CSSX) Unit (MCU)

Notes

* For example, the pKa of ethylamine (primary amine) is 10.63 and the pKa of triethylamine (tertiary amine) is 10.65.

Additional information

Funding

We also thank Savannah River Remediation (SRR) for funding this work.