Determination Of Fluoride In The Ethiopian And Imported Black Tea (camellia Sinensis) Infusions Prepared In Tap And Fluoride Rich Water

Tea leaves are very rich in fluoride, since the tea plant take up fluoride from the soil andrnaccumulate in its leaves. Depending upon the fluoride content of the water, dried tea leaves arernalso able to absorb fluoride from water with high fluoride level. In this study, the possible effectrnof original fluoride concentration in natural water on the fluoride release from tea has beenrninvestigated and also conductivity, salinity, TDS and pH of naturally fluoride rich water and therntea infusions prepared in deionized water, tap water and fluoride rich water have beenrndetermined. Moreover, the possible capacity of tea leaves (commercially available tea) to absorbrnfluoride from naturally high-fluoride water which were collected from Ethiopia Rift Valleyrnwhere the fluoride level of water is high has been investigated.rnInfused fluoride content, conductivity, salinity, TDS and pH of black (either powder or bagrnform) and green (bag form) teas and different water (sampled from Ethiopia Rift Valley) werernassayed. Fluoride ion selective electrode, conductivity meter and pH meter were used torndetermine the fluoride content, conductivity, salinity, TDS and pH of the six naturally differentrntypes of water, nine brands of tea prepared in deionized water, tap water and naturally fluoridernrich water whose origin from Ethiopia, Sri Lanka and China. The fluoride content, conductivity,rnsalinity, TDS and pH of six naturally different water ranged from 0.254-30.2 mg/L, 2.27-1706rnμs, 0-0.9 %o, 48.7-838 mg/L and 7.73-8.59, respectively, infused fluoride, conductivity, salinity,rnTDS and pH in nine brands of tea ranged from 50.8-2057 mg/kg, 414-2377 μs, 0.2-1.2 %o, 196-rn1180 mg/L and 4.83-8.52, respectively, which were prepared in naturally different types of waterrnin different brewing time (3, 5 and 10 min) infusion. Even though, the fluoride level of tearnprepared in naturally fluoride rich water is high, one can reduce the daily intake of fluoride levelrnby taking tea rather than taking the naturally fluoride rich water itself.rnKeywords: naturally fluoride rich water, fluoride, tea infusion, brewing time, ISE

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