Determining of Flouride Content in Tea by Spectrophotometery and Potentiometry

Tea contains a high amount of fluoride and its consumption may affect the whole intake of fluoride. Excessive intake of fluoride over the long term may lead to the development of dental or skeletal fluorosis. In this study, fluoride content of 30 samples of tea was determined using potentiometery and spectrophotometery. Results showed that potentiometeric method is more precise than spectrophotometry, so the results obtained from the first method were analyzed and those of the second method were excluded. The results showed no significant difference in the fluoride content of black and green tea, but the difference between the fluoride content of black tea bags with black and green tea is significant. According to WHO s recommendation about daily intake of fluoride and average daily consumption 4 cups of tea (1000 ml), in this study, fluoride content of 7 samples was more than the recommended amount (2 mg/l).

کلیدواژه ها:

Fluoride ، Potentiometry ، Spectrophotometry ، Black tea ، Green tea