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Analytical Letters Volume 44, 2011 - Issue 12
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MASS SPECTROMETRY

ESI-QIMS Investigation of Sr, Rb, and Crown Ether Mixture Solutions

Sheng Song Arkansas State University, State University, Arkansas, USA
,
Rohana Liyanage University of Arkansas Statewide Mass Spectrometry Facility, Fayetteville, Arkansas, USA
,
Jackson O. Lay Jr. University of Arkansas Statewide Mass Spectrometry Facility, Fayetteville, Arkansas, USA
,
Richard Warby Arkansas State University, State University, Arkansas, USA
&
Hideya Koizumi Arkansas State University, State University, Arkansas, USACorrespondence[email protected]
Pages 2170-2181 | Received 29 Jun 2010, Accepted 30 Aug 2010, Published online: 12 Aug 2011
 
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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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