Simultaneous Determination of Copper(II) and Cobalt(II) Ions, Copper(II) and Manganese(II) Ions in Drinking Water Using Indicator Test Tubes Based on Carboxylic Cation-Exchangers

We investigated a possibility of determining two metal ions (Cu 2+ and Co 2+ , Cu 2+ and Mn 2+ ) in a single water sample using an indicator test tube filled with a carboxylic cation exchanger of a macrocellular (KB-2E-10, KB-2E-16) or a macroporous (Tokem-250) structure. Under dynamic conditions, the separation of the chromatographic zones of colored Cu 2+ and Co 2+ ions was achieved in the presence of water macro components, that is, Ca 2+ and Mg 2+ ions. An analytical reagent, formaldoxime, was used to determine colorless Mn 2+ ions. The performance characteristics of the developed procedures are determined. The lowest limit of detection for ions was obtained using a KB-2E-16 cation exchanger; it is 0.016 mg/L for Cu 2+ , 0.045 mg/L for Co 2+ , and 0.003 mg/L for Mn 2+ . The proposed procedures were used to analyze real samples for the concentration of Co 2+ and Cu 2+ or Mn 2+ and Cu 2+ on their simultaneous presence. The accuracy of the results was evaluated by the standard addition method.