oa South African Journal of Chemistry - The determination of 11B/10B and 87Sr/86Sr isotope ratios by quadrupole-Based ICP-MS for the fingerprinting of South African wine : research article
The 11B/10B and 87Sr/86Sr isotope ratios in wines and soils of four major South African wine-producing regions have beendetermined by quadrupole-based ICP-MSin order to establish a fingerprint for origin verification of the wines. The 11B/10Bisotoperatio was found to be a useful tool to distinguish among the wines of the selected wine regions. In addition, the use of B isotoperatios together with elemental concentrations of selected indicator elements as independent variables in a lineardiscriminant 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 sampleswere prepared using microwave-assisted digestion followed by the isolation of boron and strontium from the sample matrixthrough 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-producingregions included in this study, since the wines of only one region could be distinguished from the others.
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