Accelerator Mass Spectrometry of Actinides in Ground- and Seawater: An Innovative Method Allowing for the Simultaneous Analysis of U, Np, Pu, Am, and Cm Isotopes below ppq Levels

Francesca Quinto (Korresp. Autor*in), Robin Golser, Markus Lagos, Markus Plaschke, Thorsten Schaefer, Peter Steier, Horst Geckeis

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

Abstract

236U, 237Np, and Pu isotopes and 243Am were determined in ground- and seawater samples at levels below ppq (fg/g) with a maximum sample size of 250 g. Such high sensitivity was possible by using accelerator mass spectrometry (AMS) at the Vienna Environmental Research Accelerator (VERA) with extreme selectivity and recently improved efficiency and a significantly simplified separation chemistry. The use of nonisotopic tracers was investigated in order to allow for the determination of 237Np and 243Am, for which isotopic tracers either are rarely available or suffer from various isobaric mass interferences. In the present study, actinides were concentrated from the sample matrix via iron hydroxide coprecipitation and measured sequentially without previous chemical separation from each other. The analytical method was validated by the analysis of the Reference Material IAEA 443 and was applied to groundwater samples from the Colloid Formation and Migration (CFM) project at the deep underground rock laboratory of the Grimsel Test Site (GTS) and to natural water samples affected solely by global fallout. While the precision of the presented analytical method is somewhat limited by the use of nonisotopic spikes, the sensitivity allows for the determination of ∼105 atoms in a sample. This provides, e.g., the capability to study the long-term release and retention of actinide tracers in field experiments as well as the transport of actinides in a variety of environmental systems by tracing contamination from global fallout.

OriginalspracheEnglisch
Seiten (von - bis)5766-5773
Seitenumfang8
FachzeitschriftAnalytical Chemistry
Jahrgang87
Ausgabenummer11
DOIs
PublikationsstatusVeröffentlicht - 2 Juni 2015

ÖFOS 2012

  • 103014 Kernphysik

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