Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry.
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(4) is avoided. Although Th and U are complet...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
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2009
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| _version_ | 1826270127701622784 |
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| author | Negre, C Thomas, A Mas, J Garcia-Orellana, J Henderson, G Masqué, P Zahn, R |
| author_facet | Negre, C Thomas, A Mas, J Garcia-Orellana, J Henderson, G Masqué, P Zahn, R |
| author_sort | Negre, C |
| collection | OXFORD |
| description | 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(4) is avoided. Although Th and U are completely dissolved with a first microwave step, around 40% of (231)Pa remains undissolved, 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 (MC-ICPMS). Overall chemical yields range around 50% for Pa, 60% for Th, and 70% for U. |
| first_indexed | 2024-03-06T21:35:59Z |
| format | Journal article |
| id | oxford-uuid:464924ab-f30a-477f-a364-6058195cc267 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:35:59Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:464924ab-f30a-477f-a364-6058195cc2672022-03-26T15:12:49ZSeparation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:464924ab-f30a-477f-a364-6058195cc267EnglishSymplectic Elements at Oxford2009Negre, CThomas, AMas, JGarcia-Orellana, JHenderson, GMasqué, PZahn, RThis 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(4) is avoided. Although Th and U are completely dissolved with a first microwave step, around 40% of (231)Pa remains undissolved, 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 (MC-ICPMS). Overall chemical yields range around 50% for Pa, 60% for Th, and 70% for U. |
| spellingShingle | Negre, C Thomas, A Mas, J Garcia-Orellana, J Henderson, G Masqué, P Zahn, R Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry. |
| title | Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry. |
| title_full | Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry. |
| title_fullStr | Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry. |
| title_full_unstemmed | Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry. |
| title_short | Separation and measurement of Pa, Th, and U isotopes in marine sediments by microwave-assisted digestion and multiple collector inductively coupled plasma mass spectrometry. |
| title_sort | separation and measurement of pa th and u isotopes in marine sediments by microwave assisted digestion and multiple collector inductively coupled plasma mass spectrometry |
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