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- W97006979 abstract "A pyrolytic method was developed for the separation of fluoride from clays and related refractory materials which is much simpler and less time consuming than classical methods previously used for this purpose. A sample which, preferably, contains 0.01 to 25 mg of fluoride is intimately mixed with a flux, sodium tungstate (Na/sub 2/WO/sub 4/), and a compatible accelerator, tungstic oxide (WO/sub 3/), and pyrolyzed at 825 deg C in a stream of moist oxygen for 1.5 hr. The fluoride is volatilized, absorbed in dilute sodium hydroxide, and subsequently determined by acidimetric or spectrophotometric titrimetry. A detniled procedure is given, several variables which were evaluated in establishing optimum operational conditions are discussed, and test results obtained by applying this method to the analysis of standard opal glass and phosphate rock samples from the National Bureau of Standards are compared with the certified vaiues for fluoride. In these instances the coefficient of variation is less than 0.5%. The pyrolytic method was utilized to analyze light clay and clay-like samples which contained from 0.1 to 12 mg of fluoride per gram. The coefficient of variation was found to be 8%. (auth)" @default.
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- W97006979 date "1958-05-12" @default.
- W97006979 modified "2023-09-27" @default.
- W97006979 title "SEPARATION OF FLUORIDE FROM REFRACTORY MATERIALS BY FUSION-PYROLYSIS" @default.
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