Discussion
Kappa number is a measure of
Answer: C
Correct answer: the residual lignin in a pulp
Kappa number measures how much potassium permanganate a pulp consumes, which is proportional to the lignin remaining after cooking. It is the mill’s daily control figure - it says whether the cook has gone far enough and how much bleaching chemical the pulp will need, and it substitutes for a direct lignin determination that would be far too slow.
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