Artículo
Separation and measurement of Pa, Th and U isotopes in marine sediments by microwave-assisted digestion and MC ICP-MS
Autor/es | Negre, César
Thomas, Alexander L. Más Balbuena, José Luis García Orellana, Jordi Henderson, Gideon M. Masqué, Pere Zhan, Rainer |
Departamento | Universidad de Sevilla. Departamento de Física Aplicada I |
Fecha de publicación | 2009 |
Fecha de depósito | 2024-04-15 |
Publicado en |
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Resumen | This manuscript describes a new protocol for determination of Pa/Th/U in marine sediments. Based on microwave-assisted digestion, it represents an important reduction of working time over conventional hot-plate digestion ... This manuscript describes a new protocol for determination of Pa/Th/U in marine sediments. Based on microwave-assisted digestion, it represents an important reduction of working time over conventional hot-plate digestion methods, and the use of HClO4 is avoided. While Th and U are completely dissolved with a first microwave step, around 40% of 231 22 Pa remains un-dissolved 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; while 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 (MC-ICP-MS). Overall chemical yields range around 50% for Pa, 60% for Th and 70% for U. |
Cita | Negre, C., Thomas, A.L., Más Balbuena, J.L., García Orellana, J., Henderson, G.M., Masqué, P. y Zhan, R. (2009). Separation and measurement of Pa, Th and U isotopes in marine sediments by microwave-assisted digestion and MC ICP-MS. ANALYTICAL CHEMISTRY, 81 (5), 1914-1919. https://doi.org/10.1021/ac802341y. |
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Pa_Th_meth_AC.pdf | 291.8Kb | [PDF] | Ver/ | |