Division 2 Definitions

‘TVB-N concentration’ means the nitrogen content of volatile nitrogenous bases as determined by the reference procedure described.

‘Solution’ means an aqueous solution as follows:

1. (a)

   perchloric acid solution = 6 g/100 ml;

2. (b)

   sodium hydroxide solution = 20 g/100 ml;

3. (c)

   hydrochloric acid standard solution 0,05 mol/l (0,05 N). When using an automatic distillation apparatus, titration must take place with a hydrochloric acid standard solution of 0,01 mol/l (0,01 N);

4. (d)

   boric acid solution = 3 g/100 ml;

5. (e)

   silicone anti-foaming agent;

6. (f)

   phenolphtalein solution = 1 g/100 ml 95 % ethanol;

7. (g)

   indicator solution (Tashiro mixed indicator) = 2 g methyl-red and 1 g methylene-blue dissolved in 1 000 ml 95 % ethanol.