Indian toxicology / by F.N. Windsor.

  • Windsor, F. N.
Date:
1906
Catalogue details

Licence: In copyright

Credit: Indian toxicology / by F.N. Windsor. Source: Wellcome Collection.

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    transfer this to an incinerating capsule and evaporate to dryness. Then incinerate completely in a blow pipe flame, and when cool, dissolve the residue in half a test- tube of boiling distilled water. Altering this while hot into a test-tube and then cooling. Sulphuretted hydrogen passed through the fluid will give a black precipitate, if lead, copper or tin be present, and white if zinc. The two former only need be consi- dered (see pp. 55 & 52), and since the latter of these may well be derived from the copper Foil, the original material must be tested for this element. Quantitative Estimation of Metals will rarely be required, and need not be described at length. In most cases organic matter must be destroyed by boiling with potassium chlorate and hydrochloric acid, by nitric acid or by incineration. The latter obviously will not do for the volatile arsenic compounds. For the estimation of small quantities of arsenic a modification of Marsh’s test is used and the strength of the metallic deposit compared with prepared standards. The electro- lytic method is now generally employed for evolution of the arseniuretted hydrogen. A simple method of estimat- ing arsenic is described on page 46. Testing for Vpigetable Poisons. The examination for these cannot be carried out with material which has been subjected to Reinsch’s test, etc., but since after the extraction of vegetable active principles, the residue is available for an analysis of minerals, unless such have been detected in the foregoing investigation, a w, IT 2
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