Excerpt from Year-Book of Pharmacy: Comprising Abstracts of Papers Relating to Pharmacy, Materia Medica, and Chemistry Contributed to British and Foreign Journals; From July 1, 1885, to June 30, 1886; With the Transactions of the British Pharmaceutical Conference
The applicat... ion Of the permanganate test in water analysis is stated by A. Dupre to give more satisfactory results if the process be conducted in the presence of phosphoric instead of sulphuric acid, and at a very low temperature. A. J. Cooper has investi gated the relative delicacy Of the various tests for poisonous metals in potable water, and reports in favour of sulphuretted hydrogen. While engaged with determinations of lead in potable waters, L. T. O'shea has made the interesting Observation that filter papers possess in an appreciable degree the power of absorbing the salts of this metal from solutions passed through them, and Of retaining it after washing. This phenomenon strikes us as some what analogous to the fixing Of many metallic salts, and other substances used as mordants, on the fibre Of cloth, and leads us to infer that salts Of copper, tin, aluminium, and other metals, may probably also be retained by filter papers under certain conditions. We beg to suggest experiments in this direction.
The purification Of impure drinking waters by means of alum is strongly advocated by P. T. Austin and F. A. Wilber, who find that this treatment not only clarifies the water, but also removes disease germs and ptomaines. From 1 to 2 grams Of the alum should be dissolved in 60 litres of the water, which should then be allowed to stand for about forty-eight hours, and afterwards decanted or filtered from any precipitate formed.
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