Abstract

A microdetermination method for titanium, at levels of micrograms per liter, based on ion-exchange spectrophotometry (IES) has been developed. Titanium reacts with chromotropic acid and oxalate and the ternary complex is sorbed on Dowex 1-X8 anionic resin. The resin phase absorbance at 440 and 800 nm is measured directly. The detection limit is 0.6 μg · liter −1 for a 500-ml sample method and 0.4 μg · liter −1 for a 1000-ml sample method. The RSD is about 4%. This method has been applied successfully to the determination of titanium in seawater samples from the Mediterranean coast.

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