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Rapid collection of iron hydroxiedes for determination of Th isotopes in seawater using polyamin type chelating resin

Okubo, Ayako; Obata, Hajime*; Magara, Masaaki ; Kimura, Takaumi ; Ogawa, Hiroshi*

This work introduces a novel method of recovery of iron hydroxide with thorium using a DIAION CR-20 chelating resin column to determine Th isotopes in seawater with a sector field (SF) inductively coupled plasma mass spectrometer (ICP-MS). Thorium isotopes in seawater were co-precipitated with iron hydroxide, and this precipitate was sent to chelating resin column. The chelating column quantitatively collect $$^{232}$$Th with iron hydroxide in seawater at flow rate of 20-25 mL/min. Based on this flow rate, 5 L sample was processed within 3-4 h. The aging of iron hydroxide tends to reduce the recovery of $$^{232}$$Th. The rapid collection method was successfully applied to the determination of$$^{230}$$ Th and $$^{232}$$Th in open-ocean seawater samples.

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