Manual of the medicinal preparations of iron : including their presentation, chemistry, physiological action, and therapeutic use / by Harry Napier Draper.

  • Draper, Harry Napier.
Date:
1864
Catalogue details

Licence: Public Domain Mark

Credit: Manual of the medicinal preparations of iron : including their presentation, chemistry, physiological action, and therapeutic use / by Harry Napier Draper. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    phosphate of soda (2]SraO, h PO5), a gelatinous precipitate is obtained, which dries into a tasteless, nearly white powder. In this form the pyrophosphate of iron is not usually employed in medicine. During the last few years, however, several preparations of this salt have been intro- duced. That which is most commonly met with, and which is known as soluble pyrophosphate of iron, or simply as pyrophosphate of iron, is made by dissolving the recently precipitated pyrophosphate in a solution of either pyrophos- phate of soda or of citrate of ammonia, evaporating to a syrupy consistence and scaling upon glass. According to Mr. Robbins,* the best result is obtained by using as a sol- vent citrate of soda. The following formula is based upon the data given by this gentleman:— Pyrophosphate of soda free from I * water of crystallization j Protosulphate of iron . . 1-3 „ Citrate of soda . . . 1 „ Dissolve in sufficient water the pyrophosphate of soda, and having converted in the usual manner the proto- sulphate of ii'on into a solution of the persalt, mix the solutions. Wash the resulting precipitate thoroughly, and with the aid of heat dissolve it in a solution of the citrate of soda, using as little water as possible. Filter the solution, evaporate to a syrupy consistence, and spread on glass to dry. The process of drying must be conducted at a very low temperature (not exceeding 90° or 100°) in order to ensure success in scaling. Citrate of ammonia may be substituted for the soda citrate. Physical Characters—Pyrophosphate of peroxide
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