Determining the acid-insoluble ash content of cellulose samples.
Sample is dry- ashed and the residue treated with hydrochloric acid.
Insoluble residue is filtere, washed, ignited, and weighed.
Method measures all acid insoluble material.
Shows accurate but time-consuming wet-ash procedure for determining the silicates and silica content of pulp, see TAPPI T 245 “Silicates and Silica in Pulp (Wet Ash Method).”
Silica or silicates are the major components of the acid-insoluble ash.
