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Strontium: Mercury-Cathode Amalgam Turned to Hydride and Distilled in Vacuo (Guntz and Roederer, Roscoe 1913)
Strontium chloride solution is electrolysed onto a mercury cathode, giving strontium amalgam. Heating it in vacuum and then in hydrogen drives off the mercury and leaves strontium hydride, which breaks down in vacuum at red heat; the strontium boils off and condenses on a water-cooled steel tube.
Result: silver-white strontium, 98.6-99 % pure (99.4 % after a second distillation).
Source: Guntz and Roederer (1906), in Roscoe and Schorlemmer, A Treatise on Chemistry vol. 2 (1913), pp. 595-596. Not given: current, anode, amounts. Mercury vapour is poisonous; the fine metal catches fire in air. Picture drawn by Youblob.
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