The University of Southampton
University of Southampton Institutional Repository

Effect of model ligands on iron redox speciation in natural waters using flow injection with luminol chemiluminescence detection

Record type: Article

The effects of dissolved organic compounds on the determination of nanomolar concentrations of Fe(II) have been compared using two luminol-based flow injection chemiluminescence (FI-CL) methods. One used the direct injection of sample into the luminol reagent stream, and the other incorporated on-line solid-phase extraction of the analyte on an 8-hydroxyquinoline microcolumn. The CL signals from analyses of dissolved iron species (Fe(II) and Fe(III)) with model ligands and organic compounds were examined in high-purity water and seawater. The organic compounds included natural reducing agents (e.g., ascorbic acid), nitrogen -donor/-acceptor compounds (e.g., 1,4-dipyridine, protoporphyrin IX), aromatic compounds (e.g., 1,4-dihydroxybenzene), synthetic iron chelators (e.g., EDTA), and natural iron binding compounds (e.g., desferrioxamine B, ferrichrome A). Fe(II) determinations for both luminol FI-CL methods were affected by submicromolar concentrations of redox-active compounds, strong iron binding ligands (i.e., log KFeL > 6), and compounds with electron-donating functional groups in both high-purity water and seawater. This was due to reactions between organic molecules and iron species before and during analysis, rather than chemiluminescence caused by the individual organic compounds. In addition, the effects of strong ligands and size speciation on Fe(II) recoveries from seawater following acidification (pH 2) and reduction (100 M sodium sulfite) were investigated.

Full text not available from this repository.

Citation

Ussher, S.J., Yaqoob, M., Achterberg, E.P., Nabi, A. and Worsfold, P.J. (2005) Effect of model ligands on iron redox speciation in natural waters using flow injection with luminol chemiluminescence detection Analytical Chemistry, 77, (7), pp. 1971-1978. (doi:10.1021/ac048850a).

More information

Published date: April 2005

Identifiers

Local EPrints ID: 38095
URI: http://eprints.soton.ac.uk/id/eprint/38095
ISSN: 0003-2700
PURE UUID: 96785a9b-01f4-430b-9120-bd5a47f323d6

Catalogue record

Date deposited: 01 Jun 2006
Last modified: 17 Jul 2017 15:40

Export record

Altmetrics

Contributors

Author: S.J. Ussher
Author: M. Yaqoob
Author: E.P. Achterberg
Author: A. Nabi
Author: P.J. Worsfold

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×