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South African Journal of Chemistry

versão On-line ISSN 1996-840X
versão impressa ISSN 0379-4350

S.Afr.j.chem. (Online) vol.63  Durban  2010

 

RESEARCH ARTICLE

 

The determination of 11B/10B and 87Sr/86Sr isotope ratios by quadrupole-based ICP-MS for the fingerprinting of South African wine

 

 

C. Vorster; L. Greeff; P.P. Coetzee*

Department of Chemistry, University of Johannesburg, PO Box 524, Johannesburg, 2006, South Africa

 

 


ABSTRACT

The 11B/10B and 87Sr/86Sr isotope ratios in wines and soils of four major South African wine-producing regions have been determined by quadrupole-based ICP-MS in order to establish a fingerprint for origin verification of the wines. The 11B/10B isotope ratio was found to be a useful tool to distinguish among the wines of the selected wine regions. In addition, the use of B isotope ratios together with elemental concentrations of selected indicator elements as independent variables in a linear discriminant analysis procedure was shown to be a highly successful method to classify wine according to geographical origin. A good correlation between the B and Sr isotope ratios in wine and its provenance soil was found. Both wine and soil samples were prepared using microwave-assisted digestion followed by the isolation of boron and strontium from the sample matrix through element-specific ion exchange. Isotope ratio measurements with good precision, ~0.1 % RSD, for both boron and strontium have been obtained. The 87Sr/86Sr ratio showed limited potential as an indicator of provenance in the wine-producing regions included in this study, since the wines of only one region could be distinguished from the others.

Keywords: Boron isotope ratio, strontium isotope ratio, ICP-MS, wine analysis, fingerprinting, provenance determination


 

 

Full text available only in PDF format.

 

Acknowledgements

The authors thank Winetech (Project No. WW08/28) for research funding, and Dr O. Augustyn from ARC-Nietvoorbij for sourcing and collecting wine samples.

 

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Received 31 May 2010
Accepted 5 July 2010

 

 

*To whom all correspondence should be addressed. E-mail: ppcoetzee@uj.ac.za

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