The National Formulary (Paperback)

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1916. Not illustrated. Excerpt: ... THE NATIONAL FORMULARY PART III SPECIAL TESTS AND REAGENTS (Reprinted from the U. S. Pharmacopoeia IX by special permission of the Trustees of the U. S. Pharmacopceial Convention.) Arsenic Test Test Apparatus.--Prepare several generators, equipped with tubes, etc., as described below. Select as a generator a bottle of about 50 mils capacity, having a mouth about 2.5 cm. in diameter and provide a well-fitting rubber stopper, suitably perforated. In the perforation in this stopper insert a vertical exit tube about 13 cm. in total length and 1 cm. in diameter throughout the upper portion (for about 10 cm.) and constricted at its lower extremity to a tube of about 3 cm. in length and about 5 mm. in diameter. This latter tube should extend but slightly below the stopper. In the lower wide part of this exit tube insert a small pledget of dry glass wool (see page 361) and then a strip of the freshly prepared but dry lead acetate test paper (see page 302) rolled into a coil, and above this a plug of the moist (not wet) lead acetate glass wool (see page 362). In the upper extremity of this tube insert through a perforated cork stopper, a glass tube 12 cm. in length, having an internal diameter of about 3 mm. Place the mercuric bromide test paper (see page 362) in this tube, bending or creasing the upper portion of the strip so that it will retain its position. The strip should extend within about 2 cm. of the perforated cork stopper and must not be introduced into the tube until ready to start the test, This tube should be thoroughly cleaned and dried each time it is used. Standard Arsenic Test Solution.--Dissolve 0.1 Gm. of arsenic trioxide (see page 361), which has been finely pulverized, dried in a desiccator, and accurately weighed, in about 5 mils of a 20 per cent, ...