URINE 4 11 



Fluorides, Nitrates, Silicates and Hydrogen Peroxide 



These substances are all found in traces in human urine under nor- 

 mal conditions. Nitrates are undoubtedly introduced into the organ- 

 ism in the water and ingested food. The average excretion of nitrates 

 is about 0.5 gram per day, the output being the largest upon a vegeta- 

 ble diet and smallest upon a meat diet. Nitrites are found only in 

 urine which is undergoing decomposition and are formed from nitrates 

 in the course of ammoniacal fermentation. Hydrogen peroxide has 

 been detected in the urine, but its presence is believed to possess no 

 pathological importance. 



