Jan. 6. 1919 Determination of Acidity and Nitrogen in Wheat 



Adding Formaldehyde at Ph 7 



Total quantity (cc.) of NI20 sodium hydroxid to neutralize to Ph 7 . 4. 9 

 Total quantity (cc.) of NJ20 sodium hydroxid to neutralize again 

 to Ph 7 after adding formaldehyde 2. 7 



Adding Formaldehyde at Ph 8.3 



Total quantity (cc.) of NI20 sodium hydroxid to neutralize to Ph 



8-3 • "-3 



Total quantity (cc.) of NI20 sodium hydroxid to neutralize again 

 to Ph 8.3 after adding formaldehyde 3.3 



Adding Formaldehyde at Ph 9.3 



Total quantity (cc.) of NI20 sodium hydroxid to neutralize to Ph 



9-3 14-8 



Total quantity (cc.) of NI20 sodium hydroxid to neutralize again 

 to Ph 9.3 after adding formaldehyde 3.4 



This shows that sHghtly higher results are obtained when the for- 

 maldehyde is added at the higher concentrations and the solution is 

 titrated again to the same concentrations. 



From data obtained in connection with some other work the follow- 

 ing figures are added. The figures represent the number of cubic centi- 

 meters of N/20 alkali needed to neutralize after the addition of for- 

 maldehyde, the titrations ha\dng first been made to the concentrations 

 shown. 



One question not settled by the data given in this paper is to what 

 point should the titration be carried after the addition of the formalde- 

 hyde. This question is reserved for future work. 



On the basis of the above discussion we may say that the results in 

 Table I show the following in regard to amino nitrogen : 



1. At 5° C. there is practically no increase in the amount of amino 

 nitrogen as the time of digestion is increased. 



2. At 20° C. the amount of amino nitrogen reaches the maximum 

 shortly after 8 hours. 



3. At 40° C. the amount of amino nitrogen reaches the maximum at 

 2 hours. 



4. The calculated results in Table II show a gradual increase in the 

 amount of amino nitrogen to the end of the 24 hours with one minor 

 exception at 40*^ C. The results on amino nitrogen are graphically pre- 

 sented in figure 4. 



