Single column sequential extraction of Ra, Nd, Th, Pa and U from a natural sample Jeandel, C. Venchiarutti, C. Bourquin, M. Pradoux, C. Lacan, F. van Beek, P. /Riotte, Jean chemical extraction chromatography isotopes natural samples marine geochemistry radium neodymium thorium protactinium uranium extraction chimique isotopes echantillons naturels geochimie marine radium neodyme thorium protactinium uranium A new procedure allowing the sequential extraction of Ra, Nd, Th, Pa and U from the same initial natural sample (sea or river waters, particles, sediments, rocks) is proposed. Extraction recoveries were better than 90%. Procedural blanks ranged from 80 pg (for Nd) to below 1 fg, the detection limit of the MC-ICP-MS used (for Pa); all were negligible compared with the amounts of elements currently determined. Based on classical anionic resins attached to a peristaltic pump allowing precise flow rate control, this procedure allowed a consequent reduction of the sample size, which improved the sampling resolution and reduced the sampling cost. It also ensured a better consistency of the samples for the five tracers. 2011 text https://www.documentation.ird.fr/hor/fdi:010054308 fdi:010054308 Jeandel C., Venchiarutti C., Bourquin M., Pradoux C., Lacan F., van Beek P., Riotte Jean. Single column sequential extraction of Ra, Nd, Th, Pa and U from a natural sample. 2011, 35 (4), 449-459 EN