Stopped-flow kinetic spectrophotometric method for the simultaneous determination of iron, titanium and vanadium

✍ Scribed by Jianhuan Wang; Ronghuan He

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 436 KB
• Volume: 276
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80413-f

✦ Synopsis

A kinetic method for the simultaneous determination of iron, titanium and vanadium is proposed based on their inductive effects on the chromium(VI)-iodide-starch reaction in weakly acidic medium. The reaction was monitored with the stopped-flow spectrophotometric technique. The calibration graphs are linear in the ranges O-2.2,0-3.1 and O-l.8 pg ml-' for Fe(II), Ti(II1) and V(IV), respectively, and the detection limits are 0.012, 0.020 and 0.018 pg ml-', respectively. It was found that lOO-loo0 times higher concentrations of Co'+, Ni*+, Zr4+, Mn'+, Cd'+, Cu2+, Pb2+ and tervalent rare earths ions do not interfere with the determination. The method was applied to the determination of Fe, Ti and V in an aluminium alloy and a synthetic sample.