Abstract
Experiments were performed to investigate the quantity of fluorine ion and the correlation of fluorine ion to sodium ion in green tea and it's extract.
For the separation of fluorine, the extracts were distilled at 137-140°C and the distillates were titrated with thorium nitrate solution. Sodium ion was determined by sodium ion electrode measurement.
Green tea contained 70.9-112.8ppm of fluorine and 715-2, 252ppm of sodium ion. Concentrations of fluorine and sodium ion of the extract of green tea were 1.34-2.50ppm and 89-112ppm, respectively. The amount of sodium ion was normally 10-20 times as much as that of fluorine ion in green tea. When fluorine ion content was large in quantity, that of sodium ion was also large. The correlation coefficients were 0.122 in tea leaves and 0.63 in it's extract.
