Laboratory manual for the detection of poisons and powerful drugsAuthorized translation of the completely rev4th German ed. . rom a Kipp generator enters theflask by one tube and leaves by the other. Attach to the lattera U-tube filled with pieces of pumice stone saturated withconcentrated potassium hydroxide solution to absorb hydrogensulphide. Connect the other end of the U-tube with a hard ^ Fresenius and Neubauer use a screw pinch-cock instead of a gas-cock but bymeans of a short rubber connector they interpose an ordinarj cock between thegas flask A and the U-tube C. 2 Forschungsbericht i
Laboratory manual for the detection of poisons and powerful drugsAuthorized translation of the completely rev4th German ed. . rom a Kipp generator enters theflask by one tube and leaves by the other. Attach to the lattera U-tube filled with pieces of pumice stone saturated withconcentrated potassium hydroxide solution to absorb hydrogensulphide. Connect the other end of the U-tube with a hard ^ Fresenius and Neubauer use a screw pinch-cock instead of a gas-cock but bymeans of a short rubber connector they interpose an ordinarj cock between thegas flask A and the U-tube C. 2 Forschungsbericht iiber Lebensmittel und ihre Beziehungen zur Hygiene,etc., 4, 241-258 (1897). 12 DETECTION OF POISONS glass tube tipped with platinum.^ Cut the paper containingthe precipitate into small pieces and place in the flask whichcontains in addition a few pieces of phosphorus-free zinc andenough water to seal the thistle tube. Light the hydrogen afterit has passed through the apparatus for some time and beenfound free from air by the usual test. Seen in the dark theflame should be entirely colorless and burn without a green cone. Fig. 5.—-Hilger-Natterman Apparatus. • or a greenish glow.^ Hilger and Nattermann advise a spectro-scopic examination of the flame to determine the purity of thezinc. Pure zinc gives a hydrogen spectrum which shows onlyan orange colored line in place of the yellow sodium line. Theminutest trace of phosphorus will give three green lines lyingto the right of the line D. The color of two of these lines is morepronounced than that of the third. Having thus tested thepurity of zinc and sulphuric acid, pour a few cc. of dilute sul-phuric acid (i : 5) through the thistle tube into the flask con-taining zinc and the silver precipitate. If the latter containsphosphorus, the flame will show, though not always at once, agreen coloration which should be examined with the spectro-scope. ^ Hilger and Nattermann use a platinum tipped blow-pipe instead of a glasstube tippe
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