Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . Fig. 46. —The DoremusApparatus for the Esti-mation of Urea. CHEMICAL PROPERTIES. 685 pendent rubber tube seen iu the illustration (Fig. 47) a small testtube containing 5 of the urine to be tested is placed in the smallerbottle with 25 or 30 of the test solution—Li(iuor soda) chloratse,U. S. P.; the stopj)er is tightly replaced and the screw clip is the apparatus be properly connected, only a few drops of waterwill escape from the rubber tube. A
Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . Fig. 46. —The DoremusApparatus for the Esti-mation of Urea. CHEMICAL PROPERTIES. 685 pendent rubber tube seen iu the illustration (Fig. 47) a small testtube containing 5 of the urine to be tested is placed in the smallerbottle with 25 or 30 of the test solution—Li(iuor soda) chloratse,U. S. P.; the stopj)er is tightly replaced and the screw clip is the apparatus be properly connected, only a few drops of waterwill escape from the rubber tube. A graduated glass is then placedunder the open tube and the urine is caused to mingle with the de-composing solution by tipping the bottle. Since the gas which isevolved displaces its own volume of water from the larger bottle,the quantity of the latter which is found iu the graduated glass after. Fig. 47.—The Squibb Apparatus for the Estimation of Urea. the reaction has ceased will represent the volume of nitrogen. Thequantitj^ of water multiplied by gives the quantity of ureapresent in the 5 of urine tested. Fowlers Differential-Density Ilethod.—This method is based uponthe reduction of specific gravity which occurs in a specimen of urinewhen its urea is decomposed by the hypochlorites. Each degree ofdensity lost represents per cent, of urea, or about three and ahalf grains to the fluidounce. The solution of chlorinated soda isused in the test, seven parts of it decomposing the urea in one part ofurine, except when the quantity of urea is very large; then the urineshould be diluted with an equal volume of distilled water and theresult multiplied by two. About one ounce of urine should be treated with seven times asmuch of the Labarraqiies solution, and two hours should be allowedfor the decomposition. To determine the specific gravity of themixture befor
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmedicine, bookyear1895
