A Manual of Toxicology Including the Consideration of the Nature Properties E
A Manual of Toxicology Including the Consideration of the Nature Properties E
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After cooling, it should be filtered, and the solids on the filter thoroughly washed and reserved for future examination. The filtrate should now be concentrated by evaporation, and a stream of washed sulphuretted hydrogen gas passed through it, to the point of saturation. After standing for some time in a warm place, the precipitate is collected on a filter, from which it is carefully washed into a test-tube or capsule, by a jet of water. After the precipitate has subsided, the supernatant wat...er may be removed by decaatatiou, a small quantity of LEAD. EXAMINATION OF THE TISSUES. 319 nitric acid added, and a gentle heat applied. By this means the sulphide is converted into the soluble nitrate, with the separation of free sulphur. A small quantity of distilled water is now added, the mixture filtered, and the filtrate subjected to the usual tests for lead, as already pointed out. Should the quantity of the liquid be too small for the appli- cation of all the tests, it would be best first to employ sul- phuric acid : if this agent cause a white precipitate, soluble in potassa (proved to be free from lead), and this solution be turned black by sulphide of ammonium, the presence of lead may be regarded as established.
What to read after A Manual of Toxicology Including the Consideration of the Nature Properties E?
You can find similar books in the "Read Also" column, or choose other free books by John J John James Reese to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
After cooling, it should be filtered, and the solids on the filter thoroughly washed and reserved for future examination. The filtrate should now be concentrated by evaporation, and a stream of washed sulphuretted hydrogen gas passed through it, to the point of saturation. After standing for some time in a warm place, the precipitate is collected on a filter, from which it is carefully washed into a test-tube or capsule, by a jet of water. After the precipitate has subsided, the supernatant wat...er may be removed by decaatatiou, a small quantity of LEAD. EXAMINATION OF THE TISSUES. 319 nitric acid added, and a gentle heat applied. By this means the sulphide is converted into the soluble nitrate, with the separation of free sulphur. A small quantity of distilled water is now added, the mixture filtered, and the filtrate subjected to the usual tests for lead, as already pointed out. Should the quantity of the liquid be too small for the appli- cation of all the tests, it would be best first to employ sul- phuric acid : if this agent cause a white precipitate, soluble in potassa (proved to be free from lead), and this solution be turned black by sulphide of ammonium, the presence of lead may be regarded as established.
What to read after A Manual of Toxicology Including the Consideration of the Nature Properties E?
You can find similar books in the "Read Also" column, or choose other free books by John J John James Reese to read onlineMoreLess
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