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Issue 1, 2014
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The absolute isotopic composition and atomic weight of molybdenum in SRM 3134 using an isotopic double-spike

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Abstract

Analytical techniques have been developed to perform a fully calibrated measurement of the isotopic composition of molybdenum reference materials using multiple collector inductively coupled plasma mass spectrometry. A correction for instrumental mass bias was performed using a molybdenum double-spike prepared from gravimetric mixtures of 92Mo and 98Mo isotope spikes. The absolute isotopic composition of the NIST SRM 3134 molybdenum reference material with 2 s.d. uncertainty was determined to be 92Mo = 14.65(4), 94Mo = 9.187(12), 95Mo = 15.873(10), 96Mo = 16.673(3), 97Mo = 9.582(6), 98Mo = 24.29(3), and 100Mo = 9.74(2). The atomic weight of molybdenum in SRM 3134 was calculated as Ar = 95.949(3). Delta values (reported as δ98/95Mo relative to SRM 3134) were determined for SCP Science – PlasmaCal molybdenum as −0.42(10)‰ and for Johnson-Matthey pure molybdenum rod as −0.45(12)‰. The total natural variation of molybdenum of −1.5‰ to +3‰ results in a calculated atomic weight interval of Ar = [95.944, 95.956].

Graphical abstract: The absolute isotopic composition and atomic weight of molybdenum in SRM 3134 using an isotopic double-spike

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Publication details

The article was received on 09 May 2013, accepted on 19 Sep 2013 and first published on 10 Oct 2013


Article type: Paper
DOI: 10.1039/C3JA50164G
Citation: J. Anal. At. Spectrom., 2014,29, 85-94
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    The absolute isotopic composition and atomic weight of molybdenum in SRM 3134 using an isotopic double-spike

    A. J. Mayer and M. E. Wieser, J. Anal. At. Spectrom., 2014, 29, 85
    DOI: 10.1039/C3JA50164G

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