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Study on effect of sodium based buffers on the isotopic measurement of boron using Na2BO2+ by thermal ionization mass spectrometry

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Abstract

Alkali metaborate ions are usually monitored for the isotopic measurement of boron by positive thermal ionization mass spectrometry. Large variations in the of 10B/11B isotopic ratios are observed with the change in the mole ratios of B/Na when sodium carbonate solutions are added when compared with solution of neutral salt of sodium (NaCl). To understand the reason for the variations observed in the isotopic ratio of 10B/11B with the change in the mole ratio of B/Na, various sodium containing buffers effective in the pH range 3–9 were employed in the present studies instead of the conventionally used sodium carbonate for formation of Na2BO2+ ions in the ion source. NIST SRM-951 having certified 10B/11B ratio 0.2473 ± 0.0002 was used for all isotopic measurements by TIMS. It could be concluded that irrespective of the pH, the foremost reason for variations in the isotopic ratio of 10B/11B is the amount of Na present as Na2O on the filament.

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Authors and Affiliations

  1. Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    K. Sasi Bhushan, Radhika M. Rao, Preeti G. Goswami & S. Kannan

  2. Homi Bhabha National Institute, Mumbai, 400094, India

    K. Sasi Bhushan & S. Kannan

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  1. K. Sasi Bhushan
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  2. Radhika M. Rao
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  3. Preeti G. Goswami
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  4. S. Kannan
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Correspondence to Radhika M. Rao.

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Sasi Bhushan, K., Rao, R.M., Goswami, P.G. et al. Study on effect of sodium based buffers on the isotopic measurement of boron using Na2BO2+ by thermal ionization mass spectrometry. J Radioanal Nucl Chem 323, 1367–1372 (2020). https://doi.org/10.1007/s10967-019-06741-0

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  • DOI: https://doi.org/10.1007/s10967-019-06741-0

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