Simultaneous determination of Fe(III) and Fe(II) ions via complexation with salicylic acid and 1,10-phenanthroline in microcolumn ion chromatography.

Anal Sci. 2008;24(11):1487-92.
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Simultaneous determination of Fe(III) and Fe(II) ions via complexation with salicylic acid and 1,10-phenanthroline in microcolumn ion chromatography.

Oktavia B, Lim LW, Takeuchi T.

Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.Fe(III) and Fe(II) ions were separated and determined via in-column and post-column reactions with salicylic acid and 1,10-phenanthroline by microcolumn ion chromatography with UV-Vis detection. The separation could be achieved on a silica microcolumn using an aqueous ethanol solution of salicylic acid as eluent. The effluent from the column was then mixed with aqueous ethanol solution of 1,10-phenanthroline and detected at 518 nm. Fe(III) ion was detected as the complex with salicylic acid, whereas Fe(II) ion was detected as the complex with 1,10-phenanthroline. The detection limits with 0.25 microL injection volume at S/N = 3 were 0.21 and 0.10 mg L(-1) for Fe(III) and Fe(II), respectively. Increasing the injection volume of sample, e.g., 5.1 microL, improved the sensitivity; the detection limits at S/N = 3 were 12 and 9.2 microg L(-1) for Fe(III) and Fe(II), respectively. The present system was applied to the determination of iron in a local well water sample.

Publication Types:
Evaluation Studies

PMID: 18997380 [PubMed - indexed for MEDLINE]