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The remaining liquor, which contains the iodine, is mixed with successive portions of sulphuric acid in a leaden retort, and after standing some days to allow the sulphureted hydrogen, etc., to escape, peroxide of manganese is added, and the whole gently heated. Iodine distills over in a purple vapor, and is condensed in a receiver, or in a series of two-necked globes. Properties.
As the wind set toward us, we soon became aware of an evil smell petroleum and sulphureted hydrogen at once which gave some of us a headache. The pitch here is yellow and white with sulphur foam; so are the water-channels; and out of both water and pitch innumerable bubbles of gas arise, loathsome to the smell. We became aware that the pitch was soft under our feet.
A dog perished in air containing a hundredth part, and a horse in air containing a fiftieth part of it." Sulphureted hydrogen gas is the deleterious agent exhaled from privies or vaults, which have been so fatal, at times, to night men, who have been employed to remove or cleanse them. Dr. Dunglison. The preceding are far from being all the causes of atmospheric impurity.
If, however, the solutions of such ores are treated with sulphureted hydrogen or sulphurous acid, instead of zinc or stannous chloride to reduce the iron, and the excess reducing agent removed by boiling, an accurate determination of the iron can be made. PROCEDURE. Grind the mineral to a fine powder. Weigh out two portions of about 0.5 gram each into small porcelain crucibles.
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