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On-line pervaporation separation process for the potentiometric determination of fluoride in “dirty” samples

✍ Scribed by I. Papaefstathiou; M.T. Tena; M.D.Luque de Castro

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
589 KB
Volume
308
Category
Article
ISSN
0003-2670

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✦ Synopsis

A selective method for the determination of fluoride in contaminated samples based on pervaporation of a volatile derivative and potentiometric monitoring of the anion after collection in a basic solution has been developed. Fluoride was converted to volatile trimethylfluorosilane by reaction with hexamethyldisilazane, and absorbed in dilute NaOH solution. Both the continuous and stopped-flow modes were used in order to accomplish a variable efficiency of the separation process thus enlarging the determination range which was established between 5 and 100 mg 1~ ', the precision ranging between 2.60 and 3.58%. The determination of the analyte in samples from different sources (i.e., tap water, well water, fertilizers and ceramic industry wastewater) testifies to its usefulness.

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