. The occurence and distribution of nitrates and nitrites in food, feces and urine. tus and the arrangement of the same on page 14. Solutions:- The solutions required for the determinationas used are, a ferrous chloride solution , obtained by dissolving100 grams of iron nails in one liter of concentrated hydrochloricacid, nitric acid free hydrochloric acid, specific gravity ,a ten per cent solution of chemically pure castic soda, and astrong solution of sodium hydroxide, obtained by dissolving jnpounds of Greenbanks alkali in eight liters of distilled water. Procedure:- The material to be
. The occurence and distribution of nitrates and nitrites in food, feces and urine. tus and the arrangement of the same on page 14. Solutions:- The solutions required for the determinationas used are, a ferrous chloride solution , obtained by dissolving100 grams of iron nails in one liter of concentrated hydrochloricacid, nitric acid free hydrochloric acid, specific gravity ,a ten per cent solution of chemically pure castic soda, and astrong solution of sodium hydroxide, obtained by dissolving jnpounds of Greenbanks alkali in eight liters of distilled water. Procedure:- The material to be analyzed, after being madealkalin with the ten per cent sodium hydroxide, is evaporated todryness on the steam bath, except in cases of direct determinationof foods,feces, and small samples of water extracts. The residueis. taken up with boiling water, transfered to the distilling flaskand the apparatus connected as shown on the preceding page. Afterfilling the stem of the dropping funnel with boiling water, toremove the air contained therein, the contents of the distilling ! 14. flask are heated with a free flame, as shown, until steam issuesfreely from the delivery tube. After this has continued for a fewminutes., that is until the rubber tip of the delivery tube, uponbeing held under the surface of the alkali in the receiving jar,shows that all the air has been expelled from the apparatus, thegraduated receiving tube is filled and put in place, and the appa-ratus is ready for the reagent-::-* The reagent, consisting of 25ccof each the hydrochloric acid and the ferrous chloride, is meas-ured into a ca-^role, heated to boiling, and carefully added tothe boiling sample in the distilling flask. The reagent and thesample are now heated until all the nitric oxide has been liberatedand collected in the receiving, and the mixture in the flask hasbeen boiled almost to dryness. The rubber tip of the delivery tubeis no?/ removed from under the receiving, tube, the flame is removedfrom
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