Abstract
Metal ions, such as cobalt, nickel, copper, zinc and cadmium, were separated as the anionic metal-EDTA complexes using an ion-chromatograph equipped with anion separator system. The separated complex anions in the eluent (3×10−3 M NaHCO3/2.4×10−3 M Na2CO3) were detected by conductivity measurement. When 100 μl of the sample solution containing 10−4 M EDTA was introduced into the analytical system, up to 5.0 ppm of metal ions were determined. The method was applied to the determination of metal ions in plating solution and waste water samples. When the sample solution was introduced into the system, a chromatogram of anions in the sample was obtained. Then the sample solution with EDTA was introduced and a chromatogram of anions and metal-EDTA complexes was obtained. The metals were determined from the difference of the former and the latter chromatograms.
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