Transport of low molecular weight anions through a Nafion ionomer membrane: Application to kraft cooking liquors

The permeation of low molecular weight anions from liquors having high ioni c strengths through a Nafion 811 membrane in Na+ form has been studied. The penetration of solutes through the membrane was monitored using UV-visible spectrometry. A relation between penetration and ionic size has been estab lished. The influence of the presence of other ions on the permeation has a lso been investigated. The results show that the membrane has Great potenti al as part of a selective interface in applications where the concentration of small anions is to be monitored in media with high ionic strengths. In light of the new results, we have validated a previously developed system f or monitoring the concentrations of hydrogen sulfide ion and dissolved lign in in a laboratory-scale kraft cooking system.