Abstract
An azo dye, prepared from diazotized p-aminosalicylic acid and disodium salt of chromotropic acid, produces a reddish violet, soluble thorium complex. The color reaction exhibits an absorbance maximum at a wave length of 580 m mu and conforms to Beer's law. The thorium-dye complex appears to have the composition 1 to 1. A direct spectrophotometric method has been developed for the determination of thorium in dilute solutions. Only iron, zirconium, cerium(IV), gold, Phosphates, and fluorides intefere. The interference of iron(III) can be removed by adding ascorbic acid. Thorium has also been estimated in monazite and black sands extracts with this dye. (auth)
Published Version
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