582 



PHYSIOLOGICAL CHEMISTRY 



half of the period (days four to six) add an abundance of base -forming foods to the 

 diet. Distilled water should be used for drinking purposes and a uniform volume 

 should be ingested daily. Collect the urine in 24-hour periods, preserve and 

 analyze for H ion concentration, titratable acidity and ammonia (for methods 

 see Chapter XXVI). Compare your results with those tabulated in the table 

 below. 



REACTION OF URINE AS INFLUENCED BY DIET 1 



20. Hydrogen Ion Concentration of the Urine as Influenced by 

 Alkali and Acid Ingestion. The ingestion of certain organic salts of the 

 alkalis, e.g., sodium citrate and sodium bicarbonate will cause a decrease 

 in the hydrogen ion concentration of the urine. The ingestion of acids 



INFLUENCE OF INGESTED SODIUM BICARBONATE ON H ION 

 CONCENTRATION OF URINE 



1 Tabulated from data reported by Blatherwick (Arch. Int. Med., 14, 49> 

 Experiments all made on the same subject (B). 



2 Basal diet No. i contained 100 grams Graham crackers, 25 grams butter, 400 c.c. whole 

 milk ingested at each of the three daily meals. One apple and one soft boiled egg added at 

 supper. In diet No. 2 whole wheat crackers were substituted for the Graham crackers. 



3 This day was preceded by NaHCO 3 ingestion "for three days and by rice ingestion for 

 four days. 



4 This diet followed immediately after the diet of prunes (see 5). 



