title: Ion-pair formation of a copper(II)-ammine complex with an anionic surfactant and the recovery of copper(II) from ammonia medium by the surfactant-gel extraction method.
abstract: The extraction and separation of copper(II), zinc(II), cobalt(II), and cadmium(II) were investigated. Both copper(II) and zinc(II) formed ammine-complexes, while cadmium(II) and cobalt(II) formed hydroxide precipitates in an ammonia medium. By the addition of sodium dodecylsulfate (SDS), a copper(II) complex formed an ion-pair (copper-ammine-DS), which was extracted into the SDS phase. However, a zinc(II) complex did not form an ion-pair, and was soluble in water. Copper(II) ion was recovered by stripping (back-extraction) after the addition of hydrochloric acid. This method was applied to the separation of copper(II) in a brass alloy.
authors.affiliation: Department of Chemistry, Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8512, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nakai
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Murakami
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Isamu
authors.initials: I
authors.lastname: Fujiwara
authors.forename: Shoji
authors.initials: S
authors.lastname: Tagashira