SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF TITANIUM IN GEOCHEMICAL AND METALLURGICAL SAMPLES

The reaction between cyclohexan-1,2-dione bissalicyloylhydrazone and t itanium(IV) has been studied spectrophotometrically. An orange complex (lambda = 470 nm, epsilon = 1.49 x 10(4) l.mol-1.cm-1) is quickly for med at pH 1-2.5 in a 3+2 V/V ethanol/water medium. Interferences (more than 65 species) have been investigated. In presence of some masking agents most of metal ions do not interfere. The orange complex has bee n satisfactorily used for the determination of titanium in amphibolite s, granites, suspended matter, Portland cement, bauxite, cast iron and duraluminium alloy. The results are compared with those obtained usin g AAS and ICP methods.