Fluoride content of Iranian black tea and tea liquor

The objectives of this study were to investigate the fluoride (F) content of various commercial brands of tea (Camellia sinensis L) marketed in Iran and to compare the release of F from them by infusion. The minimum and maximum F content was 35 6 mg/kg and 182 +/- 20 mg/kg in Sedaghat and Sharzad tea, respectively. The F content of tea liquor prepared by customary infusion from these teas ranged from 0.53 +/- 0.07 to 2.60 +/- 0.18 mg/L. The percentage of total F released into the tea liquor by infusion from the dried tea ranged from 67.7 +/- 8% for Golestan tea to 91.0 +/- 4% for Ahamad tea.