Fluoride is considered as an
essential element forhuman beings. In potable waters, a fluorideconcentration
of 1 μg/ml is necessary to preventtooth decay. However, at higher
concentrations (>2μg/ml), it has adverse effects such as causingfluorosis.
Fluoride toxicity is prevailant in variousparts of Andhra Pradesh, Madhya
Pradesh andGujarat. Due to natural as well as anthropogeniccauses, the levels
of fluoride in ground waters canimpossible by government laboratories. In order
tomonitor fluoride, there is a need for fast, simple andcost effective method,
which can be easily adaptedby common man. Visual colorimetric methods wouldbe
the most suited for such applications. The mostcommonly used visual method is
based onbleaching of Zirconium-Alizarin complex. Thismethod requires one hour
for colour developmentand moreover, in this method, change in colour withfluoride
concentration is gradual and hence a seriesof standards need to be prepared for
quantification.This requires a skilled and experienced person.
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