Volume 26, Number 9, November 1998Qualite de l'air
|Page(s)||370 - 372|
Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamineN. Hirayama1, N. Ichitani1, N. Kuzuya1, K. Kubono2, H. Kokusen3 and T. Honjo1
1 Department of Chemistry, Faculty of Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
2 Division of Natural Science, Osaka Kyoiku University, Asahigaoka, Kashiwara 582-8582, Japan
3 Department of Chemistry, Faculty of Education, Tokyo Gakugei University, Nukui-Kita-machi, Koganei 184-8501, Japan
Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N, N'-bis(2-pyridylmethyl)-1,2-ethanediamine (H2bbpen), a colorless hydrophobic divalent hexadentate ligand, and potential use of the ligand for the spectrophotometric determination of iron(III) in aqueous solution was investigated. In the pH range 2.0 - 3.0, Fe(III) forms stable 1:1 complex with H2bbpen, and Fe(III) can be determined selectively as the purple Fe(bbpen)+ complex (λmax = 560 nm, ε = 4.3 × 103 dm3 mol-1 cm-1, log β1 = 32.6 ± 0.1). In this system, linear calibration range of Fe(III) was 5 × 10-6 - 2 × 10-4 mol dm-3 (0.3 - 12 μg cm-3) and detection limit was 3 × 10-6 mol dm-3 (0.2 μg cm-3). Furthermore, most of foreign metal cations did not influence largely the determination of Fe(III).
Key words: N,N'-bis(2-hydroxyphenylmethyl)-N, N'-bis(2-pyridylmethyl)-1,2-ethanediamine / iron(III) / complexation / spectrophotometric determination.
© EDP Sciences, Wiley-VCH 1998