Geographical Origin Identification of Tequila Based on Multielement and Stable Isotopes

Table 2

Accuracy of δ¹³C values and δ¹⁸O values of tequila by isotope ratio mass spectrometry.

Number	δ^13C (%)	δ^18O (%)
1	−12.42	−13.21
2	−12.47	−13.26
3	−12.31	−13.23
4	−12.54	−13.29
5	−12.57	−13.24
6	−12.36	−13.24
7	−12.65	−13.27
8	−12.59	−13.22
Mean	−12.49	−13.24
SD	0.12	0.03

^∗The data shown in the table has been automatically calibrated by the instrument to the value of the international standard V-PDB and V-SMOW.