Potential of Multi-Element Isotopic Approach for Geographical Origin Discrimination of Tea

Ekaterina Epova, Sylvain Bérail, Bernard Médina, Julien Barre

Abstract

The determination of strontium and lead isotope abundance ratios by MC-ICP-MS (multicollection inductively coupled plasma mass spectrometry) has been applied to 28 authentic teas from various origin. A noticeably different value of 87Sr/86Sr has been obtained for Japanese tea. A distinctive trend of Pb-isotope ratios has been observed for the different geographic regions of sample origin. The combination of isotopic and elemental concentrations tremendously increases the discrimination possibilities compared to a single isotopic or elemental system.

Keywords

geographic origin, food authenticity, strontium isotopes, lead isotopes, MC-ICP-MS

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IMEKO TC

TC23 - Metrology in Food and Nutrition

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