Mini-Encyclopedia of Papermaking Wet-End Chemistry
Part Two: Definitions and Concepts

Alkalinity

The alkalinity of an aqueous system equals the amount of strong acid (such as HCl) consumed when the pH of a unit volume is titrated to a methyl-orange endpoint (pH approx. 4.0). Relatively high levels of alkalinity may be due to the presence of bicarbonate ions, carbonate ions, calcium carbonate filler. Alkalinity tends to consume papermaker's alum (Al2(SO4)3.14H20).

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This page is maintained by Martin hubbe, Associate Professor of Wood and Paper Science, NC State University, m_hubbe@ncsu.edu .