title: Ion exchange properties of Japanese natural zeolites in seawater.
abstract: Ion exchange properties of five different Japanese natural zeolites in seawater were examined.  Sodium ions could be reduced by all zeolites, although anions, Cl(-) and SO(4)(2-), in seawater showed barely changes.  Natural zeolite desalination treatment mainly depends on the ion exchange between Na(+), K(+) and Mg(2+) in seawater and Ca(2+) in natural zeolite.  This study found that mordenite is superior to clinoptilolite for use in Na(+) reduction.  Mordenite with high cation exchange capacity containing Ca(2+) resulted in the highest Na(+) reduction from seawater.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering and Resource Science, Akita University, Akita, Japan. wajima@gipc.akita-u.ac.jp
authors.forename: Takaaki
authors.initials: T
authors.lastname: Wajima