By Anil K. Mukherji, R. Belcher and M. Frieser (Auth.)
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Additional info for Analytical Chemistry of Zirconium and Hafnium
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Note. (1) Loss of volume in the depolymerization digestion is immaterial. Evaporation to fumes is equally effective. (2) 100 milliequivalents of sulfuric acid is a desirable maximum. Prior evaporation of an aliquot, if necessary, to establish around 5 N acidity is preferable to using any excess acid. (3) Titration with EDTA should be commenced at an acidity not less than 2 N for amounts of zirconium above 60 mg in order to avoid depolymerization. 2, yielding a sharp endpoint. 5 %. (5) Sinha and Das Gupta(44) and Pilkington and Wilson(35) do not agree on the depolymerization action of sulfuric acid.