Is a Lead Isotope Ratios in Wine Good Marker for Origin Assessment?

Slađana Đurđić; Vesna Stanković; Slavica Ražić; Jelena Mutić

doi:10.3389/fchem.2021.746695

Is a Lead Isotope Ratios in Wine Good Marker for Origin Assessment?

Front Chem. 2021 Oct 4:9:746695. doi: 10.3389/fchem.2021.746695. eCollection 2021.

Authors

Slađana Đurđić¹, Vesna Stanković², Slavica Ražić³, Jelena Mutić¹

Affiliations

¹ Department of Analytical Chemistry, Faculty of Chemistry, University of Belgrade, Belgrade, Serbia.
² Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Belgrade, Serbia.
³ Department of Analytical Chemistry, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia.

Abstract

Lead isotope ratio pattern (²⁰⁶Pb/²⁰⁷Pb, ²⁰⁸Pb/²⁰⁶Pb, ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb, and ²⁰⁸Pb/²⁰⁴Pb) was analyzed in 59 samples of Serbian wine, from four geographical regions. By utilization of powerful inductively coupled plasma mass spectrometry (ICP-QMS), lead isotope ratios were used as unique "fingerprint", when combined with multivariate methods of analysis (Principal Component Analysis), provided information on the geographical origin of wine. In validation of ICP- QMS method and quantitative analysis, the certified reference material NIST SRM 981 was employed to test the mass-bias correction and thallium isotopes ²⁰³Tl and ²⁰⁵Tl (NIST SRM 997) as an internal standard. The obtained results were discussed in correlation with the corresponding values of LIRs of different European and Australian wines. In addition, the impact of anthropogenic Pb from different sources on the total Pb isotopic composition in Serbian wines was analyzed too. On the other side, the obtained values of Pb content were compared with the applicable health safety standards, according to the International Code of Oenological Practices.

Keywords: ICP-QMS; Serbian wines; geographical origin; lead isotopes; principal component analysis.