Commission Regulation (EC) No 152/2009 of 27 January 2009 laying down the methods of sampling and analysis for the official control of feed (Text with EEA relevance) (c. 152)

ANNEX III U.K. METHODS OF ANALYSIS TO CONTROL THE COMPOSITION OF FEED MATERIALS AND COMPOUND FEED

C. DETERMINATION OF THE CONTENT OF CRUDE PROTEIN U.K.

7. Verification of the method U.K.

7.1. Repeatability U.K.

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 %.

7.2. Accuracy U.K.

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 %.