Separation and measurement of Pa, Th, and U isotopes in Marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry

C. Negre, J. Garcia-Orellana, P. Masqué, R. Zahn, A.L. Thomas, G.M. Henderson, J.L. Mas

Research output: Contribution to journalArticlepeer-review

Abstract

This manuscript describes a new protocol for determination of Pa/Th/U in marine sediments. It is based on microwave-assisted digestion and represents an important reduction of working time over conventional hot-plate digestion methods, and the use of HClO is avoided. Although Th and U are completely dissolved with a first microwave step, around 40% of Pa remains undis- solved, and a short hot-plate step with reverse aqua regia is required to achieve total digestion and spike equilibration. Next, the method involves a separation of these elements and a further purification of the Pa fraction using Dowex AG1-X8 resin. Separation with Bio-Rad and Sigma-Aldrich resins was compared; although both perform similarly for Th and U, Pa yields are higher with Bio-Rad. Finally, samples are measured using a Nu instruments multiple collector inductively coupled plasma mass spectrometer (MCICPMS). Overall chemical yields range around 50% for Pa, 60% for Th, and 70% for U.
Original languageEnglish
Pages (from-to)1914-1919
Number of pages6
JournalAnalytical Chemistry
Volume81
Issue number5
DOIs
Publication statusPublished - 1 Mar 2009

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