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Division 9.3 A test portion of 1 g of milk (semi-macro Kjeldahl) can be used instead of 5 g (6.1.) provided:

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  • the amounts of the reagents used for mineralization (6.1.): H2SO4, CuSO4 · 5 H2O, K2SO4, are reduced to the same ratio (1/5).

  • the total digestion time (6.2.) is reduced to 75 minutes.

  • the amount of sodium hydroxide solution (6.3.) is reduced to the same ratio (1/5).

  • an acid standard solution (4.7.) of lower concentration (0,02 to 0,03 mol/l) has to be used.

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