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Effect of sulfate and phosphate on the colorimetric determination of fluoride by methylthymol blue

Z. Uhlíř

Lehrstuhl für anorganische Technologie an der Chemisch-technologischen Hochschule, Pardubice

 

Abstract: In the indirect colorimetric detn. of F-, 20-70 γ F-/100 ml., based on the decolorization of the Th4+-Methylthymol Blue complex, SO42- ≤1 mg./100 ml. and PO43- ≤0.1 mg./100 ml. do not interfere. A correction of 0.98 γ F- is necessary for 1 mg. of SO42-. F- can be isolated by distn. with a suitable modification of the procedure either from a H2SO4 or H3PO4, medium.

Full paper in Portable Document Format: 1810a756.pdf (in Czech)

 

Chemical Papers 18 (10) 756–762 (1964)

Tuesday, September 27, 2022

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