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Tandem ICP-mass spectrometry for Sr isotopic analysis without prior Rb/Sr separation

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Abstract
The use of a mixture of 10% of CH3F and 90% of He as a reaction gas in tandem ICP-mass spectrometry (ICP-MS/MS) enables the accurate determination of the Sr-87/Sr-86 isotope ratio in geological materials, provided that mass discrimination is corrected for by using a combination of internal (Russell law, assuming a constant Sr-88/Sr-86 isotope ratio) and external correction (using the isotopic reference material NIST SRM 987 SrCO3) in a sample-standard bracketing approach. No prior Rb/Sr separation is required as the isobaric overlap at a mass-to-charge ratio of 87 is avoided by monitoring SrF+ reaction product ions instead of Sr+ ions. Rb shows no reactivity towards CH3F. The double mass selection (MS/MS mode) prevents both spectral overlap from atomic ions at the mass-to-charge ratios of SrF+ reaction product ions and a measurable effect from the matrix on the Sr-87/Sr-86 result. This aspect is critical, as it enables accurate results to be obtained without the need for using a matrix-matched standard to correct for mass discrimination, in contrast to previous work with a quadrupole ICP-MS instrument with a CH3F/Ne-pressurized cell, in which the use of a matrix-matched standard was compulsory. The precision attainable -0.05% RSD external precision - suffices for making the newly developed method useful in a variety of applications.
Keywords
METHYL-FLUORIDE, RATIO MEASUREMENTS, ENVIRONMENTAL-SAMPLES, REACTION GAS, MS, INTERFERENCE, RESOLUTION, BIAS, LONG-LIVED RADIONUCLIDES, DYNAMIC REACTION CELL

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Citation

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MLA
Bolea Fernandez, Eduardo, et al. “Tandem ICP-Mass Spectrometry for Sr Isotopic Analysis without Prior Rb/Sr Separation.” JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, vol. 31, no. 1, 2016, pp. 303–10, doi:10.1039/c5ja00157a.
APA
Bolea Fernandez, E., Balcaen, L., Resano, M., & Vanhaecke, F. (2016). Tandem ICP-mass spectrometry for Sr isotopic analysis without prior Rb/Sr separation. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 31(1), 303–310. https://doi.org/10.1039/c5ja00157a
Chicago author-date
Bolea Fernandez, Eduardo, Lieve Balcaen, Martín Resano, and Frank Vanhaecke. 2016. “Tandem ICP-Mass Spectrometry for Sr Isotopic Analysis without Prior Rb/Sr Separation.” JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 31 (1): 303–10. https://doi.org/10.1039/c5ja00157a.
Chicago author-date (all authors)
Bolea Fernandez, Eduardo, Lieve Balcaen, Martín Resano, and Frank Vanhaecke. 2016. “Tandem ICP-Mass Spectrometry for Sr Isotopic Analysis without Prior Rb/Sr Separation.” JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 31 (1): 303–310. doi:10.1039/c5ja00157a.
Vancouver
1.
Bolea Fernandez E, Balcaen L, Resano M, Vanhaecke F. Tandem ICP-mass spectrometry for Sr isotopic analysis without prior Rb/Sr separation. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY. 2016;31(1):303–10.
IEEE
[1]
E. Bolea Fernandez, L. Balcaen, M. Resano, and F. Vanhaecke, “Tandem ICP-mass spectrometry for Sr isotopic analysis without prior Rb/Sr separation,” JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, vol. 31, no. 1, pp. 303–310, 2016.
@article{7171374,
  abstract     = {{The use of a mixture of 10% of CH3F and 90% of He as a reaction gas in tandem ICP-mass spectrometry (ICP-MS/MS) enables the accurate determination of the Sr-87/Sr-86 isotope ratio in geological materials, provided that mass discrimination is corrected for by using a combination of internal (Russell law, assuming a constant Sr-88/Sr-86 isotope ratio) and external correction (using the isotopic reference material NIST SRM 987 SrCO3) in a sample-standard bracketing approach. No prior Rb/Sr separation is required as the isobaric overlap at a mass-to-charge ratio of 87 is avoided by monitoring SrF+ reaction product ions instead of Sr+ ions. Rb shows no reactivity towards CH3F. The double mass selection (MS/MS mode) prevents both spectral overlap from atomic ions at the mass-to-charge ratios of SrF+ reaction product ions and a measurable effect from the matrix on the Sr-87/Sr-86 result. This aspect is critical, as it enables accurate results to be obtained without the need for using a matrix-matched standard to correct for mass discrimination, in contrast to previous work with a quadrupole ICP-MS instrument with a CH3F/Ne-pressurized cell, in which the use of a matrix-matched standard was compulsory. The precision attainable -0.05% RSD external precision - suffices for making the newly developed method useful in a variety of applications.}},
  author       = {{Bolea Fernandez, Eduardo and Balcaen, Lieve and Resano, Martín and Vanhaecke, Frank}},
  issn         = {{0267-9477}},
  journal      = {{JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY}},
  keywords     = {{METHYL-FLUORIDE,RATIO MEASUREMENTS,ENVIRONMENTAL-SAMPLES,REACTION GAS,MS,INTERFERENCE,RESOLUTION,BIAS,LONG-LIVED RADIONUCLIDES,DYNAMIC REACTION CELL}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{303--310}},
  title        = {{Tandem ICP-mass spectrometry for Sr isotopic analysis without prior Rb/Sr separation}},
  url          = {{http://doi.org/10.1039/c5ja00157a}},
  volume       = {{31}},
  year         = {{2016}},
}

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