STANDARDIZATION OF DISrNFECTANTS 



259 



The efficiency value of any disinfectant is found by dividing 

 the phenol coefficient by the sum of the other coefficients, as 

 follows : 



Phenol coefficient Efficiency 



Tox. coefficient + coag. coefficient + comp. cost value 



In the table the first figure in the comparative cost column is 

 the market price per pound of the disinfectant and the second figure 

 is the comparative cost (compared with phenol at 15 cents 

 per pound) . 



The Toxicity and Germ Destroying Power of Some of 

 THE More Important Disinfectants 



The values given are obtained from various sources and in some 

 instances require further verification. The table will serve as a 

 guide to a valuation of the disinfectants for purposes of general 

 disinfection. 



Germ Destroying Power and Toxicity or Disinfectants 



Name 



Alcohol 



Alum 



Ammonia 



Ammonium chloride. . . . 

 Ammonium sulphate . . . 



Antozone 



Arsenious acid 



Arsenite of soda 



Bacterol 



Benetol 



Bichloride of platinum. . 



Boracic acid 



Bromine 



Cabot's sulpho-naphthol 

 Calcium chloride 



t8 



Germ Destroying Power 

 (Phenol as l) 



0.03 

 0.64 

 2.40 

 0.03 

 0.015 



0.00 

 0.50 

 0-33 

 1-58 

 1.23 



10.00 

 0.23 

 5.00 



3-87 

 0.08 



Toxicity 

 (Phenol as lOo) 



5.00 



n .00 

 3-5° 



