Essays on the effects of iodine in scrofulous diseases : including an inquiry into the mode of preparing ioduretted baths / Translated from the French by W.B. O'Shaughnessy.

  • Lugol, Jean Guilaume Auguste, 1786-1851.
Date:
1831
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Licence: Public Domain Mark

Credit: Essays on the effects of iodine in scrofulous diseases : including an inquiry into the mode of preparing ioduretted baths / Translated from the French by W.B. O'Shaughnessy. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    3.—The Ioduret of Lead. This compound is prepared by adding a solution of 100 parts of the hydriodate of potash to a solution of 75 parts of the acetate of lead. In the preceding section I have given a diagram illustrative of the mutual decomposition which takes place. The ioduret of lead is a fine yellow powder, partially solu- ble in acetic acid and in alcohol; insoluble in cold, but per- fectly soluble in hot water, from which it crystallizes in fine hexagonal plates. One hundred parts of this compound con- sist of 54.9. iodine, 45.1. lead. The discovery of the solubi- lity of the ioduret of lead was first made by M. Polydore Boullay in 1827. It then, however, attracted but little at- tention ; and was completely forgotten when M. Caventon again casually noticed the circumstance, and placed it pro- minently before the public. The ioduret of lead has very recently been subjected to an elaborate analysis by M. Henry (fils), Journal de Phar- macie, Mai 1S31, and 100 parts found to consist of iodine 54.9, lead 45.1. When the ioduret of lead precipitated in the cold is acted on by boiling water, it is dissolved with the exception of a minute whitish grey residuum, which appears to consist of an ioduret of lead with excess of base. Various experi- ments also show that the composition of the pulverulent ioduret is by no means constant in its nature, occasionally containing free iodine and occasionally an excess of lead. The crystallized product deposited from warm water, should therefore alone be employed for pharmaceutical or medicinal purposes. I have no doubt but that this compound will be adulte- rated very extensively. The action of boiling water, however, affords a ready mode of ascertaining its purity.