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Updated: June 7, 2025
To detect lead in a glaze, M. Herbelin moistens a slip of white linen or cotton, free from starch, with nitric acid at 10 per cent. and rubs it for ten to fifteen seconds on the side of the utensil under examination, and then deposits a drop of a solution of potassium iodide, at 5 per cent. on the part which has been in contact.
This compound is largely employed in most photographic processes on paper, and may be easily prepared by the following formula: By adding iodide of potassium to a solution of nitrate of silver, a yellowish-white precipitate of iodide of silver is obtained, which is insoluble in water, slightly soluble in nitric acid, and soluble in a small degree in ammonia, which properties seem easily to distinguish it from the chloride and bromide of silver.
The excess of iodine is determined, on addition of from 10 to 15 c.c. potassium iodide solution and 150 c.c. distilled water, by means of caustic soda.
When a positive Wassermann reaction is present before treatment is commenced, the above course is prolonged as follows: for three weeks is given a course of potassium iodide, after which four more weekly injections of 0.6
This ointment has quite a reputation in Virginia, with the old ladies, for all kinds of old sores and ulcers, and it is an excellent application to indolent and purulent ulcers and sores. Take of iodide of mercury 2 parts, iodide of potassium 3 parts, camphor 2 parts, lard 32 parts; mix and keep well corked.
The clinical significance of the blood count in individual diseases will be further referred to. The Iodine or Glycogen Reaction. The leucocyte count may be supplemented by staining films of the blood with a watery solution of iodine and potassium iodide.
Make a blank test for the amount of thiosulphate solution required to react with the iodine liberated by the iodate which is generally present in the potassium iodide solution, and deduct this from the total volume used in the titration.
From the gelatinous pus the organism is cultivated without difficulty, and this is the essential step in arriving at a diagnosis. The disease yields in a few weeks to full doses of iodide of potassium.
Both potassium bromate and cupric salts in solution will liberate iodine from an iodide, which is then titrated with the thiosulphate solution. Two methods for the direct standardization of the sodium thiosulphate solution are here described, and one for the direct standardization of the iodine solution. !Method A!
Other poisonous preparations are red precipitate, white precipitate, mercuric nitrate, the cyanide and potassio-mercuric iodide. Calomel has very little toxic action. Metallic mercury is not poisonous, but its vapour is. It is soluble in sixteen parts of cold and two of boiling water. Soluble in alcohol and ether, the latter also separating it from its solution in water. Symptoms come on rapidly.
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