Laboratory manual for the detection of poisons and powerful drugsAuthorized translation of the completely rev4th German ed. . pon the water-bath until all alcohol is expelled. Passthe aqueous residue through a small filter. Extract the filtratein a separating funnel 3-4 times with 5c»-6o cc. portions of ether. Let the total ether extract stand forsome time in a dry flask, then passthrough a dry filter and distil. Dis-solve the residue in 2-3 cc. of waterand pass the solution, if necessary,through a moist filter. Add am-monium hydroxide solution untilalkaline and then saturated calciumsulphate
Laboratory manual for the detection of poisons and powerful drugsAuthorized translation of the completely rev4th German ed. . pon the water-bath until all alcohol is expelled. Passthe aqueous residue through a small filter. Extract the filtratein a separating funnel 3-4 times with 5c»-6o cc. portions of ether. Let the total ether extract stand forsome time in a dry flask, then passthrough a dry filter and distil. Dis-solve the residue in 2-3 cc. of waterand pass the solution, if necessary,through a moist filter. Add am-monium hydroxide solution untilalkaline and then saturated calciumsulphate solution. If there is a pre-cipitate, acidify with acetic acid andlet solution and precipitate standover night in a covered beaker. Ifthere is still a crystalline precipitate, it can be only calciumoxalate. A microscopic examination of this precipitate isadvisable. Calcium oxalate forms characteristic octahedronshaving the so-called envelope shape (Fig. 17). When thor-oughly washed, calcium oxalate may be converted by ignitioninto calcium oxide which may be weighed. CaO : = Weight of CaO : x(56) (126) found. Fig. 17.—Calcium OxalateCrystals. POISONS NOT IN THE THREE MAIN GROUPS 185 Calculation.—Since the quotient 5O : 126 = , multiply the weight ofcalcium oxide found by to get the corresponding amount of crystaHizedoxalic acid. FREE ALKALIES Potassium, Sodium and Ammonium Hydroxides Free Alkalies.—The same general principles used in detecting mineral acidsare applicable also to the alkalies. Since potassium and sodium compounds arenormal constituents of animal and vegetable organisms, and since ammonia is adecomposition product of nitrogenous organic matter, the examination mustalways show that the alkalies are in the free state, for they alone and their car-bonic acid salts decompose and corrode animal tissues and not their neutral salts. Poisonings due to caustic alkalies resemble those caused by corrosive taken internally, their corrosi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdrugs, booksubjectpoi
