This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
Sources of Lithium. - Native silicates and phosphates of lithium and other metals.
General Impurities of Lithium. - Alkalis, alkaline salts, and metals.
Is prepared from
Carbonate, B. and U.S.P.
Lithium chloride obtained from minerals
Precipitating with carbonate of ammonium.
Citrate, B. and U.S.P.
Lithium carbonate .
Dissolving in citric acid.
Benzoate, U.S.P. .
Neutralising in hot solution with benzoic acid, filtering, and evaporating to dryness, or crystallising.
Salicylate, U.S.P. .
Neutralising hot solution with salicylic acid, filtering, and evaporating.
Bromide, U.S.P. .
Tests. - The alkalis are detected by igniting the lithium salt and converting the carbonates which remain (when the acid has been an organic one, as citric or salicylic) into chloride by the addition of hydrochloric acid. On evaporating the filtered solution to dryness, 1 part of the residue should be completely soluble in 3 parts of alcohol, and should give no precipitate on the addition of an equal volume of stronger ether, U.S.P. (Alkaline salts, if present, would give a precipitate.) A solution in water of another portion of the residue should give no precipitate with a solution of oxalate of ammonium (absence of alkaline earths), and no precipitate or colour with hydrosulphuric acid or ammonium sulphide (absence of metals, U.S.P.).