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Abstract
A simple, rapid, highly sensitive and selective method for the spectrophotometric determination of micro amounts of thorium(IV) has been worked out using 6-chloro-3-hydroxy-2-(2`-furyl)-4H-chromen-4-one (CHFC) as a complexing agents in a weakly acidified (CH3COOH, pH 3.5) medium. The yellow complex shows maximum absorbance at 425-435nm. The method obey`s beer`s law upto 3.5 µg Th cm-2. As many as 31 cations and 11 anions and / or complexing agents do not interfere. The method has good reproducibility and can be satisfactorily applied to the determination of thorium in samples corresponding to Australian monazite in composition.