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Sir : Mesityl oxide (4-methyl-3penten-2-one) has been used for the extraction of uranium (VI) (2). Extension of these studies to zirconium(IV) revealed that zirconium(IV) can be quantitatively extracted from solutions containing 4M nitric acid and 4M sodium nitrate. Zirconium (IV) is backextracted from the organic phase with water and is spectrophotometrically determined in the aqueous phase with alizarin. This provides the basis for the liquid-liquid extraction of zirconium (IV) at the milligram level. The

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