Determination of fluoride in water - A modified zirconium-alizarin method

Industrial and Engineering Chemistry


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A convenient, rapid colorimetric procedure using the zirconium-alizarin indicator acidified with sulfuric acid for the determination of fluoride in water is described. Since this acid indicator is stable indefinitely, it is more useful than other zirconium-alizarin reagents previously reported. The use of sulfuric acid alone in acidifying the zirconium-alizarin reagent makes possible the maximum suppression of the interference of sulfate. Control of the pH of the samples eliminates errors due to the alkalinity of the samples. The fluoride content of waters containing less than 500 parts per million of sulfate and less than 1000 p.p.m. of chloride may be determined within a limit of 0.1 p.p.m. when a 100-ml. sample is used.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Determination of fluoride in water - A modified zirconium-alizarin method
Series title Industrial and Engineering Chemistry
Volume 17
Issue 3
Year Published 1945
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Industrial and Engineering Chemistry
First page 148
Last page 149