title: Application of countercurrent chromatography to the purification of chemical reagents.
abstract: Countercurrent chromatography has been employed for the purification of solid chemical reagents, such as (NH(4))(2)SO(4), NH(4)HSO(4), NH(4)F and NH(4)Cl from a number of most common metal impurities (Fe, Al, Zn, Cu, Co, Cd, Ni, Cr, Ca, Mg, K) in order to gain high-purity reagents. After evaporation these can be used for fusion decomposition purposes in trace analysis of various refractory materials (e.g. high tech ceramics). N,N-hexamethylenedithiocarbamic acid, 8-hydroxyquinoline, dibenzo-18-crown-6 and dicyclohexano-18-crown-6 were used as extracting reagents.
authors.affiliation: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Strasse 19, 117 975, Moscow, Russia.
authors.forename: T A
authors.initials: TA
authors.lastname: Maryutina
authors.forename: B Y
authors.initials: BY
authors.lastname: Spivakov
authors.forename: P
authors.initials: P
authors.lastname: Tschöpel