A GC-FID-Based Method for Quantifying the Breakdown of TiDG in NGS Solvent
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
A fast and reliable analytical technique for monitoring the levels of the Next Generation Solvent (NGS) solvent suppressor, N,N’,N”-tris(3,7-dimethyloctyl)guanidine (TiDG), is required due to the susceptibility of this guanidine to degradation arising from the thermal and chemical conditions encountered in the Next Generation Caustic-Side Solvent Extraction (NG-CSSX) process currently in use at the Savannah River Site. This report documents the development of a GC-FID-based (Gas Chromatography–Flame Ionization Detection) technique for analyzing and quantifying TiDG and its primary degradation product, di-isodecylurea (di-iDU), as a means of near real-time surveillance of the NGS solvent. Upon experimental certification, the technique was subsequently utilized to measure the degradation of this suppressor component of the NGS solvent following a storage period of 19 months at both 25 °C and 35 °C. As currently described, this simple technique can be used to monitor the amounts of both TiDG and di-iDU in NGS solvent in less than 15 minutes time, thus offering near real-time guidance as to the levels of suppressor and its primary degradation product. This analytical information is essential for calculating the quantity of TiDG that must be routinely added to the solvent under conditions of continual suppressor degradation, in order to maintain stripping performance.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Environmental Management (EM)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1491325
- Report Number(s):
- ORNL/TM-2018/930
- Country of Publication:
- United States
- Language:
- English
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