Geographical Origin Identification of Tequila Based on Multielement and Stable Isotopes

Table 1

Precision of δ¹³C values and δ¹⁸O values of the standard.

Number	Carbon black standard δ^13C (%)	GBW04458 δ^18O (%)	GBW04459 δ^18O (%)
1	−21.73	−30.20	−30.34
2	−21.71	−30.09	−30.38
3	−21.74	−30.15	−30.33
4	−21.70	−30.17	−30.30
5	−21.73	−30.12	−30.35
6	−21.75	−30.13	−30.37
7	−21.73	−30.23	−30.37
8	−21.74	−30.10	−30.41
Means	−21.73	−30.15	−30.36
SD	0.016	0.05	0.03

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