Variations in the fluoride levels of drinking water in South Africa. Implications for fluoride supplementation

Grobler S.R. ; Dreyer A.G. (1988)


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The range of fluoride levels in the drinking-water of cities and villages in South Africa was determined during the transition from a very dry (1983) to a wet (1984/85) period. The combination fluoride ion selective electrode was employed for the determination of the fluoride concentration. It was found that fluoride levels in drinking-water changed for 93% of the cities and villages studied during the period 1983 - 1985. Furthermore, it became clear that when the water volume of the supplying source increased, the fluoride level decreased significantly (P < 0,01). Boreholes showed significantly higher fluoride levels (P < 0,01) than rivers or dams. The impact of the variation in drinking-water fluoride concentrations on supplementary fluoride dosage is discussed and recommendations made.

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