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Precise determination of the strontium isotope ratios in wine by inductively coupled plasma sector field multicollector mass spectrometry (ICP-SF-MC-MS)

2001; Royal Society of Chemistry; Volume: 17; Issue: 2 Linguagem: Inglês

10.1039/b109559p

1364-5544

Mireille Barbaste, Keith Robinson, S J Guilfoyle, Bernard Médina, Ryszard Łobiński,

Analytical chemistry methods development

The 87Sr/86Sr isotope ratio of wine reflects that of the soil on which the vine is grown and is characteristic of the geographical origin of wine. A method based on ICP-MS using a sector field mass analyser with a multicollector able to reach the precision required for the discrimination of different wines (<0.005%) was developed. Strontium was separated from Rb (to avoid the 87Sr/87Rb isobaric interference) and the Sr-rich fraction was nebulized into the ICP. Precision values of 0.002–0.003% were routinely measured. The accuracy of the method, evaluated by analysis of the NIST SRM 987 (SrCO3, isotopic), was 0.02%. The analysis of 11 wines of different origins showed a clear difference between wines produced on basaltic, mixed and granitic soil areas.