Determination of arsenic in foodstuffs contaminated by arsenical war gases.

Date:
1941
Catalogue details

Licence: Public Domain Mark

Credit: Determination of arsenic in foodstuffs contaminated by arsenical war gases. Source: Wellcome Collection.

    6/8 page 4
    Zinc (AsT.).—The zinc pellets should be of approximately } inch mesh and preferably should be washed with conc. hydrochloric acid to dull the surface and kept in distilled water until required. Standard Stains.—These are prepared by submitting solutions containing known amounts of arsenite to the above Gutzeit procedure. A range from 0-005 to 0-045 mg. of arsenic is desirable. The standard strips should be immediately waxed and mounted in order on a white card, with spaces between them to facilitate comparison with other strips. The standard stains tend to fade, particularly if exposed to light, and should for that reason be kept in the dark. Fresh standards should be made every time a reagent is changed or a new batch of mercuric chloride papers prepared. W. HEFFER & SONS LTD., CAMBRIDGE, ENGLAND
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