Metal Population Reference Concentration (mg/kg) Cd The Canary Islands The present study 0.00775 ± 0.01388 Japan [59] 0.0405 ± 0.0041 Thailand [32] 0.035 Taiwan [57] ND1 Co The Canary Islands The present study 0.46 ± 0.20 Japan [59] 0.226 ± 0.004 Thailand [32] 0.294 Taiwan [57] 0.7 Cr The Canary Islands The present study 0.26 ± 0.08 Thailand [32] 1.476 Taiwan [57] 0.1 Cu The Canary Islands The present study 8.40 ± 4.5 Japan [59] 10.5 ± 0.2 Thailand [32] 15.20 Taiwan [57] 0.4 Fe The Canary Islands The present study 65.66 ± 26.77 Japan [59] 112 ± 5 Thailand [32] 167.1 Taiwan [57] 0.6 Mg The Canary Islands The present study 38.13 ± 19.79 Japan [59] 2200 ± 60 Thailand [32] 2017 Taiwan [57] 175.9 Ni The Canary Islands The present study 2.31 ± 0.54 Japan [59] 4.65 ± 0.19 Thailand [32] 5.633 Pb The Canary Islands The present study 0.03890 ± 0.02292 Japan [59] 0.734 ± 0.021 Thailand [32] 3.930 Taiwan [57] 0.01 Zn The Canary Islands The present study 5.16 ± 1.11 Japan [59] 28.1 ± 0.8 Thailand [32] 32.17 Taiwan [57] 6.3

1ND: Not detected

Table 6: Comparison of the Cd, Co, Cr, Cu, Fe, Mg, Ni, Pb and Zn concentrations in green tea: population of the the Canary Islands against other populations.