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Journal of Oceanography

, Volume 64, Issue 4, pp 541–550 | Cite as

Isotope dilution sector-field inductively coupled plasma mass spectrometry combined with extraction chromatography for rapid determination of 241Am in marine sediment samples: A case study in Sagami Bay, Japan

  • Jian ZhengEmail author
  • Masatoshi Yamada
Original Articles

Abstract

241Am is a useful tracer for understanding biogeochemical processes in the marine environment. 241Am also poses a potential radiation threat to human health due to the continuous increase of its concentration in the global environment. We report a rapid analytical method for determining 241Am in marine sediments using isotope dilution sector-field inductively coupled plasma mass spectrometry (SF-ICP-MS) combined with a high-efficiency sample introduction system (APEX-Q). A selective CaF2 co-precipitation procedure followed by TRU extraction chromatography was employed to effectively remove the major sediment matrix and to pre-concentrate 241Am. We achieved an extremely low detection limit of 0.32 fg/g or 0.041 mBq/g (for 1 gram sediment), which is better than that of alpha spectrometry, and it allowed the accurate determination of 241Am in low-level marine sediment samples. The accuracy and precision of the developed analytical method was evaluated using a laboratory prepared Am isotope standard solution and Ocean Sediment reference material (IAEA-368). The results were satisfactory. For sediment samples, overall chemical recoveries varied from 60–90%. The developed method was applied to the study of 241Am depth distribution in Sagami Bay, Japan, where we observed different depth profiles between 241Am activity and 239+240Pu activity.

Keywords

Isotope dilution SF-ICP-MS extraction chromatography 241Am marine sediments Sagami Bay 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Nakaminato Laboratory for Marine Radioecology, Environmental Radiation Effects Research GroupNational Institute of Radiological SciencesIbarakiJapan

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