Janja Zule, Jožica Dolenc
Pulp and Paper Institute, Bogišičeva 8, 1000 Ljubljana, Slovenia
Analytical procedure for determination of bound and unbound forms of alkylketene dimer (AKD) sizing agent in paper is presented. The overall sizing efficiency depends on their distribution in paper structure. Individual AKD portions were separated from each other, hydrolysed to the corresponding ketones and evaluated by GC. The method was developed on well defined reference paper samples. Some papermaking process waters were also evaluated for AKD content after extraction of hydrolised solid residue.