Yoshikawa, M. & Nakamura, E. (1993) Precise isotope determination of trace amounts of Sr in magesium-rich samples, Journal of Mineralogist, Petrologist and Economic Geologist, 88, 548-561, doi: 10.2465/ganko.88.548. < 20091114123708812.hkitagawa > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Complete separation of Sr for the isotopic analysis of Mg-rich samples, such as ultramafic rocks and their constituent minerals, was established by adopting a combination of cationexchange chromatography in H+ form and pyridinium form with a DCTA complex using extremely small volumes of cation-exchange resin (1ml and 0.5ml respectively), This method made it possible to efficiently separate nanogram sizes of Sr from coexisting large amounts of Mg and Ca with a reduced total elution volume of only 24ml. The method also resulted in the reduction of procedural blanks for Sr and Rb to 32 and 25 pg, respectively.
    Applying static multicollection mass spectrometry with Ta-oxide as an ionization activator on a V-shaped W single filament, the isotopic composition of 10 to 20 ng Sr samples separated from 40 to 55mg of ultramafic rock standard (PCC-1) was determined with analytical precision of < 0.005% and reproducibility of < 0.006%. These precise analyses were performed with a high 88Sr+ ion beam intensity ( > 1.5×10-11 A). Our efficient chemical separation procedure also ensured the absence of Ca and Mg interference to Sr ionization. The Ta-oxide readily eliminated Rb prior to the Sr isotopic analysis in the mass spectrometer. This improved the analytical reliability of isotope dilution mass spectrometry (IDMS) for the simultaneous determination of Sr isotopic composition and concentration. The measured isotopic compositions of spiked PCC-1 agreed within error with those obtained from unspiked measurements, Rb/Sr ratio analyses for PCC-1 using IDMS provided analytical reproducibilities of better than 2%. These achievements indicate that our IDMS technique is capable of yielding trace Rb and Sr concentrations simultaneously with Sr isotopic composition in Mg-rich samples with an analytical reliability similar to that obtained from larger samples (1 μg) of common silicate rock samples.

  • doi: 10.2465/ganko.88.548
  • modified at 17 h ago


(a) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT261


(a) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Thermo-Fisher MAT261
Img 1855 thumb BCR-1 < 20100824093540964.hkitagawa >pub
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • description: US Geological Survey silicate reference material - basalt; split 46, position 27
  • modified at 2020-04-24
Img 1859 thumb PCC-1 < 20100824093541348.hkitagawa >pub
  • classification: volcanic
  • physical-form: powder
  • status: (unknown)
  • description: US Geological Survey silicate reference material; peridotite; Split 22: Position 23
  • modified at 2020-04-24
name box-type global-id
binder of Precise isotope determination of trace amounts of Sr in magesium-rich samples pub container 20191126104052-444966
name device size global-id
BCR-1_W-Sb-Mo pub ICPMS Yokogawa PMS2000 3 20191008113358-748366
BCR-1 pub ICPMS Yokogawa PMS2000 22 20191008091430-063891
BCR-1_TiO2 pub HR-ICPMS Finningan, Element 1 20191008134323-829538
BCR-1_Ta-Hf-Nb-Zr pub ICPMS Yokogawa PMS2000 4 20191008105612-839208
BCR-1_S pub HR-ICPMS Finningan, Element 1 20191008141042-676268
BCR-1_Cr-Ni-Cu-Zn pub HR-ICPMS Finningan, Element 4 20191009100319-440667
BCR-1_B pub ICPMS Yokogawa PMS2000 1 20191007143804-099397
BCR-1_Pb pub TIMS Thermo-Fisher MAT261 3 20191009104304-805338
PCC-1_B pub ICPMS Yokogawa PMS2000 1 20191007143604-974698
ref-gl-pcc1 pub Q-ICPMS Agilent 7500cs 50 20170302124624-555492
PCC-1 pub ICPMS Yokogawa PMS2000 22 20191008091428-700009
PCC-1_TiO2 pub HR-ICPMS Finningan, Element 1 20191008134323-982805
PCC-1_W-Sb-Mo pub ICPMS Yokogawa PMS2000 3 20191008113359-123893
PCC-1_Li pub ICPMS Yokogawa PMS2000 1 20191015113423-352532
PCC-1_Bi-Tl-In-Cd pub Q-ICPMS Agilent 7500cs 4 20191002151233-437632
PCC-1_d66Zn pub ICPMS Thermo-Fisher Neptune 1 20191003102339-740674
PCC-1_d56Fe pub ICPMS Thermo-Fisher Neptune 1 20191003113551-257654
PCC-1_S pub HR-ICPMS Finningan, Element 1 20191008141042-175601
PCC-1_Cr-Ni-Cu-Zn pub HR-ICPMS Finningan, Element 4 20191009100319-761068
PCC-1_Ta-Hf-Nb-Zr pub ICPMS Yokogawa PMS2000 4 20191008105613-130163
PCC-1_Pb pub TIMS Thermo-Fisher MAT261 3 20191009104304-232542
PCC-1 pub MC-ICP-MS Finnigan, Neptune 1 20191219094725-707423
PCC-1_d7Li pub TIMS Thermo-Fisher MAT261 1 20200210103336-956407
BCR-1_Sr sp pub TIMS Thermo-Fisher MAT261 1 20191009144815-654576
BCR-1_Sr unsp pub TIMS Thermo-Fisher MAT261 1 20191009144509-043563
PCC-1_Sr unsp pub TIMS Thermo-Fisher MAT261 1 20191009151755-215822
PCC-1_Sr sp pub TIMS Thermo-Fisher MAT261 3 20191009151956-456953
name spots global-id
caption ID assembly stone
Table 4. Sr isotopic analyses of BCR-1 pub 20191009144349-187378 strontium 2
Table 5. Rb isotopic compositions in Sr, and Sr fractions, concentrations of Rb, and Sr isotopic compositions of PCC-1 determined by unspiked and spiked analyses pub 20191009151510-148088 Sr isotope (Yoshikawa et al., 1993) 2
manual
  • name
  • Yoshikawa, M.
  • Nakamura, E.