In the context of paper bleaching, we ought to understand the chemistry that occurs during the delignification process of pulp so as to form white paper.
However, the amount of oxidisable substance( lignin) using potassium permanganate is an important factor to consider during this process. Considering moisture free pulp that has been obtained from various Pinus species from Uganda, what is the difference in the amount of milliliters of 0.025M KMnO4 that will be absorbed by each of the pulp under specified and carefully controlled environments?
The Kappa number is a measure of lignin remaining with your pulp after the pulping process. How much permanganate is consumed will depend on the amount of lignin remaining. That of course depends on the severity of your pulping process.
Here are a few articles that may help you;
https://www.diva-portal.org/smash/get/diva2:1170355/FULLTEXT01.pdf
https://imisrise.tappi.org/TAPPI/Products/18/NOV/18NOV611.aspx
Kurt Haunreiter I have a doubt, if permanganate solution here is indirectly being referred to sodium thiosulfate being used for titration
I'm not sure I understand the question. In the method, you determine the amount of permanganate solution consumed by the pulp by titrating against sodium thiosulfate. This roughly correlates to the amount of lignin remaining in the fiber. This method really only works well for woody pulps containing guaiacyl and syringyl lignins. If you are testing non-wood pulps, you will need to perform a Klason lignin analysis for accurate results. The hexene uronic acid content of your pulp will also affect your kappa test. The method also does not necessarily account for acid-soluble lignin. It is an inferential analysis. A Klason analysis would be a more accurate method.
Here is a good manuscript to read;
https://imisrise.tappi.org/TAPPI/Products/18/NOV/18NOV611.aspx
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