Solid phase extraction of uranium and thorium from various multi-element standard solution and geological sample

Authors: Kalaya Changkrueng*, Saowaluck Thong-in, Harinate Mungpayaban

Publication Type: The 2018 Pure and Applied Chemistry International Conference (PACCON 2018)

Year: 2018

Abstract: Matrix effect is one of major problem of Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) technique. It will make inaccurate results. In some case the ratio of uranium isotope is quite sensitive necessity such as 235U/238U ratio. Solid phase extraction by using UTEVA resin is to separate uranium (U), thorium (Th) and other elements before using ICP-MS measurement. This work tests the extraction process of 2 multi-element standard solution and 3 geological samples. The experiment focus on percent recovery of U, Th, resin recycling, and matrix effect of extracted-process. The results show that UTEVA resin is highly selectivity for U/Th with other elements, then matrix effect is reduced. The other benefit of this extraction process provides increase U and Th concentration in sample that can be measured by quadrupole mass spectrometer (or ppb detection limit) and to improved confidential result of unknown samples for nuclear forensics and safeguards aspect.

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