Kappa Number Determination
Method Abstract #73
Scope and Application
This method determines the Kappa number of pulp/paper samples by determining the amount of lignin in the sample. This method is a modification of PAPTAC Standard Testing Methods Standard G.18 and conforms to TAPPI T236 om-99
This method involves first blending a weighed, dried sample with DI water. Sulfuric acid, potassium permanganate and potassium iodide are then added to the sample. The sample is then titrated with sodium thiosulphate to an inflection endpoint. The kappa number is calculated and reported.