ESI-QIMS Investigation of Sr,Rb, and Crown Ether Mixture Solutions |
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Abstract: | The isotope distribution of Sr, alternatively 87Sr/86Sr ratio frequently reported in geologic investigations, is obtained by direct electrospray ionization of aqueous samples containing Sr(II), Rb(I) with added 18-crown-6 (18c6) 1,4,7,10,13,16-Hexaoxacyclooctadecane C12H24O6 m/z 264.3]. At relatively high concentrations of Sr and Rb, we observed favorable formation of Sr2+(18c6)2 and Rb+(18c6) rather than Sr2+(18c6) complexes. Significant Sr2+(18c6)2 suppression observed in post column addition of samples into water solvent disappeared when formic acid was present in the carrier solvent. Electrospray ionization-quadrupole-ion trap mass spectrometry (ESI-QITMS) successfully obtained the expected isotope distribution of Sr showing no interference from Rb without chromatographic separation of 87Sr and 87Rb necessary in ICP-MS studies. |
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Keywords: | Crown ether ESI QIT Strontium isotope ratio |
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