From soil to grape and wine: Variation of light and heavy elements isotope ratios

In the development of a geographical traceability model, it is necessary to understand if the value of the
monitored indicators in a food is correlated to its origin or if it is also influenced by ‘external factors’ such
as those coming from its production. In this study, a deeper investigation of the trend of direct geographical
traceability indicators along the winemaking process of two traditional oenological products was
carried out. Different processes were monitored, sampling each step of their production (grape juice,
intermediate products and wine). The results related to the determinations of d18O, (D/H)I, (D/H)II,
d13C, d15N and 87Sr/86Sr have been reported. Furthermore, correspondence with the isotopic values coming
from the respective soil and vine-branch samples have been investigated as well, showing the optimal
traceability power of the monitored geographical tracers.