104 

 45 



46 



METHODS OF ANALYSIS 



Table 5. — Continued. 

 For the determination of maltose. 



[Expressed in milligrams.) 



[Chap. 



LACTOSE. 



General Gravimetric Method. — Tentative. 



Proceed as directed under 25 and obtain, from 27, the weight of lactose 

 equivalent to the weight of copper reduced. 



Soxhlet-Wein Method. — Official. 



47 REAGENTS. 



The reagents and solutions used are described under 24. 



48 



DETERMINATION. 



Place 50 cc. of the reagent in a beaker and heat to the boiling point. When 

 boiling briskly, add 100 cc. of the lactose solution containing not more than 0.300 

 gram of lactose and boil for 6 minutes. Filter immediately through asbestos and 

 determine by one of the methods given under 26, 29-34 inclusive, the amount of 

 copper reduced. Obtain, from 49, the weight of lactose equivalent to the weight of 

 copper found. 



