By D. C. Garratt D.Sc. (Lond.), Ph.D., Hon. M.P.S., F.R.I.C. (auth.)

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C. Consists principally of metallic aluminium with some oxide. It is lubricated with stearic acid during manufacture which serves to protect it from oxidation. Weigh 0·2 g into a SOO-ml flask fitted with a rubber stopper carrying a lS0-ml separator, an inlet tube connected to a cylinder of carbon dioxide and an outlet tube dipping into a water-trap, the two tubes extending only a short way into the flask. Add 60 ml of water that has been recently boiled and cooled and swirl to disperse the sample.

Dilute 10 ml to 100 ml with water in a graduated flask. To 10 ml add 40 ml of O'OSM EDTA, 90 ml of water and 0·15 ml of methyl red indicator. Neutralise with N sodium hydroxide, added dropwise, warm on a water-bath for thirty minutes and cool. Add 1 ml of dilute nitric acid (this is necessary, as otherwise there is insufficient acid to produce the required buffering action). Then add S g of hexamine and titrate with O·OSM lead nitrate using xylenol orange as indicator. 1 ml O·OSM = 0·001349 g AI.

1953, 5, 692. AMPHET AMINE Mol. Wt. P. and is assayed by determination of its basicity after solution in an excess of O·IN hydrochloric acid and back titration with alkali to methyl red. I ml O·IN = 0·01352 g. Another method of assay which can be used is that given under methylamphetamine below. 1 g residue X 0·8076 = C9H13N. Amphetamine sulphate and dexamphetamine sulphate, (CgH13N)2' H 2S0 4 , Mol. Wt. 368·5. P. Transfer about 0·4 g, accurately weighed, to a round-bottomed flask fitted for distillation, add 120 ml of water and 2 ml of 20 per cent sodium hydroxide solution.

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