MANGANESE, SULPHATE OF
\mˈaŋɡənˌiːz], \mˈaŋɡənˌiːz], \m_ˈa_ŋ_ɡ_ə_n_ˌiː_z]\
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A rose-coloured and very soluble salt, isomorphous with sulphate of magnesia. It is prepared on a large scale for the use of the dyer, by heating, in a close vessel, peroxide of manganese and coal, and dissolving the impure protoxide, thus obtained, in sulphuric acid, with the addition of a little cholohydric acid towards the end of the process. The solution is evaporated to dryness, and again exposed to a red heat, by which the persulphate of iron is decomposed. Water then dissolves the pure sulphate of manganese, leaving the oxide of iron behind. This salt has been recommended as a cholagogue, in doses of a drachm or two. The salts of manganese have been recommended in chlorosis and amenorrhoea, and as substitutes for chalybeates generally. The subcarbonate and the oxide have been chiefly employed.
By Robley Dunglison
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