Abstract
Abstract The colorimetric determination of zirconium(IV) was investigated by means of liquid-liquid extraction, where zirconium in a nitric-acid solution was quantitatively extracted into molten TOPO-benzophenone at about 60 °C. The organic phase solidifies on cooling and is separated and dissolved in methanol. The addition of an ethanolic solution of 1-(2-pyridylazo)-2-naphthol to this solution yields as intense red colour.
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