Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . already described this method depends upon the meas-urement of the volume of nitrogen gas liberated when theurea of the urine is decomposed by means of sodium hypobro-mite solution. The Doremus-Hinds ureometer (Fig. 120, ), is one of the simplest and cheapest forms of apparatus ingeneral use for the determination of urea by the hypobromiteprocess. In using this apparatus proceed as follows: Fill theside tube B and the lumen of the stopcock C w
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . already described this method depends upon the meas-urement of the volume of nitrogen gas liberated when theurea of the urine is decomposed by means of sodium hypobro-mite solution. The Doremus-Hinds ureometer (Fig. 120, ), is one of the simplest and cheapest forms of apparatus ingeneral use for the determination of urea by the hypobromiteprocess. In using this apparatus proceed as follows: Fill theside tube B and the lumen of the stopcock C with the urine 1 The values of T for the temperatures ordinarily met with are givenin the following table: Temp. Tension Temp. Tensionin mm. in mm. 15° C 210 C 160 C 13519 220 C 19675 170 C 23° C 180 C 240 C 19° C 250 C 23582 20° C I7-396 24 354 PHYSIOLOGICAL CHEMISTRY, under examination. Carefully wash out tube A with waterand introduce into it sodium hypobromite solution1 being care-ful to fill the bulb sufficiently full to prevent the entrance of air into the graduated portion. Fig. Hufxers Urea Apparatus Now allow i of urine2to flow from tube B intotube A and after the evo-lution of gas bubbles hasceased (10-20 minutes) takethe reading of the graduatedscale on tube A. In common with all othermethods which are basedupon the decomposition ofurea by means of hypobro-mite solution, this methodis not absolutely correct. Itis, however, sufficiently ac-curate for ordinary clinicalpurposes. Calculation.—Observe thereading on the graduatedscale of tube A. This tubeis so graduated as to rep-resent the weight of urea,in grams, per cubic centi-meter of urine. If we wishto compute the percentageof urea present this may bedone very readily by simplymoving the decimal point twoif the reading is gram the urine places to the right, e. g.,contains 2 per cent of urea. 1 For directions as to the preparation of this solution
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