82 



BULLETIN 846, U. S. DEPARTMENT OF AGRICULTURE. 



Effect upon the Acidity of the Fat Determination of Using the Knorr or 



Johnson Apparatus. 



Table 35 shows the effect upon the acidity of the fat deteimination 

 of using the Knorr apparatus and Johnson apparatus. 



Table 35. — Acidity of fat obtained by using the Knorr apparatus or Johnson apparatus. 



. 



Initial of analyst. 



Knorr. 



JoHnson. 



Sample 



No. 



Using 

 2.5± 

 grains. 



Using 

 5.0± 



grams. 



Using 

 2.5± 



grams. 



Using 

 5.0± 



grams. 





fB 



Cc. N/20 

 sodium 

 ethylate 

 per gram. 

 2.09 

 2.95 

 2.39 

 2.61 

 2.22 

 2.09 

 2.59 

 2.30 

 2.21 

 2.70 

 1.85 

 1.93 

 1.95 

 2.91 

 1.72 

 2.13 

 1.71 

 4.48 

 2.71 

 1.81 



Cc. N/20 

 sodium 

 ethylate 

 per gram. 

 2.15 

 2.18 

 2.08 

 2.33 

 2.17 

 1.69 

 1.80 

 2.19 

 1.95 

 2.27 

 1.50 

 2.09 

 1.69 

 2.21 

 1.51 

 2.05 

 1.67 

 3.34 

 2.71 

 1.94 



Cc. N/20 

 sodium 

 ethylate 

 per gram,. 

 2.21 

 2.13 

 1.91 

 2.48 

 2.07 

 1.8S 

 2.21 

 2.06 

 2.03 

 2.54 

 1.55 

 1.63 

 1.92 

 2.43 

 1.74 

 1.52 

 1.74 

 2.78 

 2.35 

 1.79 



Cc. N/20 



sodium 



etl ylate 



per gram. 



2.22 





D 



2.09 



16 



Je 



1.91 





H 



2.19 





[s 



2.11 





fB 



1.67 



18 



d.: 



1h 



1.89 

 1.78 





s 



1.97 





p 



1.88 





E . 



1.52 



1 



1h 



1.65 





s ::: 



1.74 





p 



1.93 





E 



1.52 



3 



H 



1.70 





s ..: 



1.63 





|D 



2.47 



15 



H... 



1.90 





is ;..: 



1.81 











2.22 



1.96 















Use of Duboscq and Schreiner Colorimeters in the Nesslerization Method 



for Ammonia Nitrogen. 



As many food laboratories are equipped with Schreiner color- 

 imeters and not with Duboscq instruments which have always been 

 recommended for this work, a series of comparative tests was made 

 with the two instruments, using the same solutions in both instru- 

 ments. The results are given in Table 36. 



