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KMID : 0385520090220050415
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Analytical Science & Technology
2009 Volume.22 No. 5 p.415 ~ p.421
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The isobaric effect on the measurement of Gd isotopes by thermal ionization mass spectrometry
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Jeon Young-Shin
Park Jong-Ho
Joe Kih-Soo
Han Sun-Ho
Song Kyu-Seok
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Abstract
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A study was performed to investigate the isobaric effects of impurities in isotope measurement of gadolinium by TIMS. Especially, the ratio of ¹??Gd/¹??Gd showed the higher value than that of natural gadolinium and also decreased as the measuring time increased. This phenomenon is considered to be due to the oxide form of La (LaO?, m/z=155) causing to create a serious bias on the measurement of ¹??Gd abundance by La as an impurity, and due to LaO? produced more than the Gd+ in the early time which disappears as the time goes on because of lower melting point and ionization potential of La than Gd. Although isobaric effects from Ba(BaO?), Ce(CeO?), Sm(SmO?), La(LaO?), and K4?(m/z=156)-cluster were detected even when blank rhenium filaments were used, these could be avoided by preconditioning(baking out) the filament. And we found that the measurement of GdO? instead of Gd? is more suitable in avoiding the isobaric effect from impurities such as La, Ce and Ba in the measurement of Gd isotope only in case of absence or extremely low level of Yb, Sm, Dy, Er, Lu.
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KEYWORD
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gadolinium, isotope, isobaric effect, lanthanum
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