Determination of Pu Isotopes in Seawater by an On-Line Sequential Injection Technique with Sector Field Inductively Coupled Plasma Mass Spectrometry

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• 作者：Cheol-Su Kim ; Chang-Kyu Kim ; and Kun Jai Lee
• 刊名：Analytical Chemistry
• 出版年：2002
• 出版时间：August 1, 2002
• 年：2002
• 卷：74
• 期：15
• 页码：3824 - 3832
• 全文大小：109K
• 年卷期：v.74,no.15(August 1, 2002)
• ISSN：1520-6882

文摘

An on-line sequential injection (SI) system combined withsector field inductively coupled plasma mass spectrometrywas developed for the determination of ultratrace level²³⁹Pu and ²⁴⁰Pu in seawater. The potential of this methodis the substantial reduction of a sample volume andrapidity in the determination of Pu isotopes. A chemicalpurification and preconcentration of Pu isotopes wereaccomplished by the on-line SI system with two microcolumns of solid-phase extraction resins, Sr-Spec andTEVA-Spec. The MCN-6000 microconcentric nebulizerwas used as a sample introduction system because of lowinterference effect and good sample utilization. With thismethod, it was possible to analyze ultratrace levels of Puisotopes in only 5 L of surface seawater with an analysisspeed of 4 h/sample. The precision of the measurementfor the ²³⁹Pu and ²⁴⁰Pu was less than 3.4 (n = 7) and 5%(n = 7) for 5 L of seawater. The detection limits for ²³⁹Puand ²⁴⁰Pu were 0.64 (1.5 Bq/mL) and 0.19 fg/mL (1.6Bq/mL), respectively. The accuracy of this method wasverified by using the reference seawater (IAEA-381) aswell as by the comparison with the -spectrometry.