The Canadian Journal of Industry, Science And Art 4
The Canadian Journal of Industry, Science And Art 4
Canadian Institute 1849 1914
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II. The solution is filtered, and the residue washed out, which requires one hour at most. C I. The carbonaceous mass is heated with nitric acid, which must of course be free from arsenic, and, as Dr. Taylor recommends, also free from hydrochloric acid. II. Hydro-sulphuric acid is passed through the solution. No impu- rities can get into the mixture. D I. The ash is washed with water, filtered, and washed out. II. The precipitate is thrown onto a filter, and washed out. £ I. The solution is eva...porated to dryness, treated with nitric acid, and evaporated several times (the term several may be assumed to mean three or four). II. The precipitate is treated with ammonia, and the filtrate evapo- rated to dryness. Here we have an extra chemical, which must be proved to be free from arsenic. There does not seem, however, to be any possibility of its containing that substance ; and among the numerous bodies in which that poison has been detected, to the best of the writer's recollection, ammonia has never been mentioned, although this of course does not preclude the neces- sity of proving its purity.
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