Preconcentration of Cobalt(II) Using Synergistic Extraction with Dithizone and Tributylphosphine Oxide

抄録

A simple preconcentration method for cobalt(II) in natural waters based on synergistic extraction is proposed. Cobalt(II) is extracted as the ternary complex, Co(II)-dithizone-tributylphosphine oxide, from 300cm³ of a water sample into 3cm³ of carbon tetrachloride at pH 5. The method was applied to a river water sample. Using this method, cobalt(II) in natural waters with levels below μg dm^-3 range could be determined by the atomic absorption spectrometry, an aliquot of the organic extract being injected into a graphite furnace.