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Which element is analysed by using the Alizarin method (Schott-Sanchis method)?
EXPLANATION
Water Pollution Dynamics
- Scott-Sanchis (Alizarin) Method: This spectrophotometric method is standard for determining Fluoride ($\text{F}^-$) in potable water supplies.
- Reaction Mechanism: Fluoride ions react with a reddish-purple zirconium-alizarin lake complex ($\text{Zr-Alizarin}$), stripping zirconium to form a colorless complex fluoride ion ($[\text{ZrF}_6]^{2-}$). The resultant bleaching/loss of red color is proportional to the fluoride concentration.
Correct option: (1) Fluoride
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