A Mini Anion Exchange Column tor the Separation of Cobalt and Nickel

  • Gary Lloyd N. Lim Chemistry Department, University of San Carlos, Cebu City
  • Josephine M. Castañares Chemistry Department, University of San Carlos, Cebu City
Keywords: anion-exchange, cobalt, nickel, ion-exchange column

Abstract

Tygon tubings with internal diameters of 1.00 and 1.25 mm respectively were packed with anion-exchange resins, Dowex-1X8 (200 mesh), at resin lengths of 15-, 20-, 25- and 30-cm. Each packed tygon tubing served as mini anion exchange columns to separate a mixture of nickel and cobalt using 9 M and 4 M HCl as eluents. Flow rates were optimized to achieve efficient separation of the two metals which were detected as Ni(DMG)2 and [Co(SCN)4]2- at 435 and 625 nm, respectively.An optimized column was found to have an internal diameter of 1.25 mm, column resin length of 25 em, flow rates of 0.376 mL/min (9 M HCl) and 0.448 mL/min (4 M HCl), and a volume capacity of 1.00 mL. This column was tested in the separation of nickel and cobalt in two sets of synthetic samples (SS-I and SS-II) and a wastewater laboratory sample giving acceptable percentage recoveries except for the low concentration level of cobalt (< 10 ppm). The study shows that the tygon mini column shows potential for the separation and analysis of the two metals.
Published
2006-04-01
How to Cite
Lim, G. L. N., & Castañares, J. M. (2006). A Mini Anion Exchange Column tor the Separation of Cobalt and Nickel. KIMIKA, 22(1), 15-22. https://doi.org/10.26534/kimika.v22i1.15-22
Section
Research Articles