File:Medical diagnosis for the student and practitioner (1922) (14761416996).jpg

Identifier: medicaldiagnosi00gree (find matches)
Title: Medical diagnosis for the student and practitioner
Year: 1922 (1920s)
Authors: Greene, Charles Lyman, 1862-
Subjects: Diagnosis
Publisher: Philadelphia, Blakiston
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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sing the apparatus shown in Fig. 61 and placingit under a proper fume-conduction hood, one measures into a Kjeldahlflask of 800 c.c. capacity, 5 c.c. of urine; 10 c.c. of concentrated sulphuricacid and 1 gram of copper sulphate. Ratio to body weight. Urea. Notpracticable. Avoid fumes. 200 MEDICAL DIAGNOSIS Oxidationprocesses. Conversioninto ammoniumsulphate. Preventbumping. Liberateammonia. Distil andrecombineammonia. Ammoniabound byacid. Titrate tomeasureamountcombined. Second.—Heat over low flame until white fumes indicate the giving off ofsulphuric acid. Third.—Add 5 grams of potassium sulphate and, shaking carefully fromtime to time, boil for from thirty to forty minutes or until the yellow colorhas entirely given place to bluish green. Fourth.—Set aside to cool. Fifth.—Add distilled water sufficient to make total quantity of liquid inflask about 250 c.c. Sixth.—Add a few bits of zinc, pumice stone or a little talcum powder toprevent bumping during the succeeding stages.
Text Appearing After Image:
Fig. 61.—Kjeldahls nitrogen apparatus. (Webster, Diagnostic Methods) Seventh.—Add 50 c.c. of 40 per cent, sodium hydrate, being careful toavoid having it touch neck of flask. Eighth.—Shake; connect by means of a Fresenius bulb with a Liebigcondenser. Ninth.—Place in an Erlenmeyer flask 50 c.c. of a decinormal sulphuricacid solution and rapidly connect the outlet tube with the bulb and condenser. Tenth.—Heat slowly and carefully to boiling and maintain slow boil fortwenty to thirty minutes or until about 150 c.c. of test mixture have passedover, or until outlet tube fails to color red litmus-paper blue, i.e., untildistillation of ammonia is complete. Eleventh.—Disconnect distilling flask and rinse both connecting and outlettubes into acid solution. Twelfth.—Titrate acid solution with decinormal sodium hydrate, usingfor an indicator rosalic acid, methyl orange, or alizarin red. The acid and alkaline solutions being standardized and of equal strength, THE EXAMINATION OF THE

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