LITERATURE CITEDdirect titrations must oe performed in hot solutions (11).Fluoride Demasking. Fluoride masking is commonly used to eliminate the interference of aluminum, zirconium, and thorium with direct EDTA titrations. In the indirect determination of thorium, ammonium fluoride is used as a demasking agent as represented by the reaction:To determine the amount of fluoride necessary to demask EDTA stoichiometrically from the Th-EDTA com-

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