Analytical Chemistry of Fluorine and Fluorine-containing Compounds

Qualitative and Quantitative Tests for Stannous Fluoride

“…The zirconiumalizarin red S mixture utilizes color measurement at 520-525 mfi (28). The alizarin red S reaction product with fluoride has also been titrated with thorium nitrate, which depends upon the formation of the insoluble thorium fluoride (28).…”

“…The zirconiumalizarin red S mixture utilizes color measurement at 520-525 mfi (28). The alizarin red S reaction product with fluoride has also been titrated with thorium nitrate, which depends upon the formation of the insoluble thorium fluoride (28). Two other zirconium lakes which have a low sensitivity to foreign ions and a high sensitivity to fluoride are the zirconium-eriochrome cyanine R (29) and zirconium-SPADNS [4,5dihydroxy-3-~p-sulfophenylazo)-2,inaphthalenedisulfonic acid, trisodiurn salt] (30).…”

Determination of Fluoride Ion by Turbidimetric Titration

“…Grant and Haendler (5) have determined macro quantities of fluoride by titrating with thorium nitrate, using a high frequency oscillometer to detect the end point, and Chilton and Horton (2) have titrated fluoride acidimetrically with aluminum ion. An excellent general review is available on the various analytical methods for the determination of fluoride through 1952 (4).…”