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The difference between the results of two parallel determinations carried out on the same sample must not exceed:
0,2 % in absolute value, for crude protein contents of less than 20 %,
1,0 % relative to the higher value, for crude protein contents from 20 % to 40 %,
0,4 % in absolute value, for crude protein contents of more than 40 %.
Carry out the analysis (digestion, distillation and titration) on 1,5 to 2,0 g of acetanilide (3.13) in the presence of 1 g of sucrose (3.14); 1 g acetanilide consumes 14,8 ml of sulphuric acid (3.5). Recovery must be at least 99 %.