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Determination of U isotopic ratios in environmental samples by ICP-MS

Opened Access Determination of U isotopic ratios in environmental samples by ICP-MS
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Autor: Uchida, Shigeo
García-Tenorio García-Balmaseda, Rafael
Tagami, Keiko
García León, Manuel
Departamento: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Física Aplicada II
Fecha: 2000
Publicado en: Journal of analytical atomic spectrometry, 15, 889-892
Tipo de documento: Artículo
Resumen: Inductively coupled plasma mass spectrometry (ICP-MS) has been used for the determination of trace elements in a variety of materials. For uranium, the concentration of 238U can be measured with a detection limit of less than 0.1 ppt in a few minutes. However, because of the extremely low 234U concentrations in environmental materials, it is necessary to separate U from the matrices and to remove interfering elements from the sample solution for measurement of the 238U/234U ratio by ICP-MS. In this study, a simple and rapid separation method for U with an extraction chromatographic resin (TEVA resin) was developed for ICP-MS and the U isotopic ratios in phosphogypsum samples, collected in Spain, were measured. The resin efficiently retained U in 6 M HCl medium and more than 98% of the U was easily eluted with the first 30 mL of 0.1 M HNO3. The separated solutions were free from most of the matrix elements and the concentrations of U in the solutions ranged from 35 to 70 ppb. ...
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