. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. he phosphoric acid in a sample of urineafter the uranium solution has been made of the properstrength, all that is necessary is to take 50 of theclear urine (filtered if necessary) and titrate it as above,after heating to about 100° C. The uranium solutionis delivered in from a burette till no further precipitateis seen in the urine, then after each addition a drop istried with ferrocyanide till the red color appears. Thenthe number of cubic centimetres used
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. he phosphoric acid in a sample of urineafter the uranium solution has been made of the properstrength, all that is necessary is to take 50 of theclear urine (filtered if necessary) and titrate it as above,after heating to about 100° C. The uranium solutionis delivered in from a burette till no further precipitateis seen in the urine, then after each addition a drop istried with ferrocyanide till the red color appears. Thenthe number of cubic centimetres used divided by ten willgive the percentage of phosphoric acid (P206). Example.—The urine for twenty-four hours=1500 of uranium acetate were required for 50 ofurine. Therefore every 50 of urine contains of phosphoric acid, 100 contains ; or the urine for twenty-four hours grammes of phosphoric acid. To determine the quantity of phosphoric acid that iscombined with calcium and magnesium (earthy phos-phates) 100 or 200 of the dear urine is made alkaline. Fig. 426burette with reservoir, 418 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. , with ammonia and allowed to stand for from ten totwelve hours. The clear fluid is decanted through a fil-ter, and the precipitated triple and amorphous phosphateswashed from the beaker on the filter with dilute ammo-nia ; this washing is repeated. This precipitate, contain-ing all the earthy phosphates, is now washed with diluteacetic acid, through a perforation made in the filter, intoa beaker, dissolved in ascetic acid, made up to about and titrated as above described. Physiological causes of variation in excretion of phos-phates.—The quantity of phosphoric acid excreted isincreased by animal diet. This is shown by the factthat phosphates are present in largest quantities afterthe chief meal of the day, , with most people in theafternoon. Phosphoru
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
