Simultaneous speciation determination of vanadium(IV) and vanadium(V) as EDTA complexes by liquid chromatography with UV detection

✍ Scribed by Jen-Fon Jen; Shih-Ming Yang

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 661 KB
• Volume: 289
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)80012-x

✦ Synopsis

A liquid chromatographic UC) method for the simultaneous determination of the speciation of vanadium(IV1 and vanadium(V) was developed by using reversed-phase ion-pair liquid chromatography. VanadiumW) and vanadium(V) were complexed with EDTA in a precohnnn, then a Cs column was used to separate the vanadium-EDTA complexes from other species with an eluent containing acetonitrile, EDTA and tetrabutylammonium ion. The separated species were monitored at 245 nm with a UV detector. Factors affecting the chromatographic behaviour, complex stability and possible interferences were investigated. The proposed LC-UV detection method provides a simple procedure for the determination of vanadium speciation. The detection limits were 1.0 ng for both species with a 207~1 injection. The relative standard deviations for vanadiumW1 and vanadium(V) were 0.69% and 0.43%, respectively, for a 20 pg ml-' (20~~1) injection (n = 5).