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Investigation of iron(III) reduction and trace metal interferences in the determination of dissolved iron in seawater using flow injection with luminol chemiluminescence detection

Ussher, Simon J., Milne, Angela, Landing, William M., Attiq-ur-Rehman, Kakar, Séguret, Marie J.M., Holland, Toby, Achterberg, Eric P., Nabi, Abdul and Worsfold, Paul J. (2009) Investigation of iron(III) reduction and trace metal interferences in the determination of dissolved iron in seawater using flow injection with luminol chemiluminescence detection Analytica Chimica Acta, 652, (1-2), pp. 259-265. (doi:10.1016/j.aca.2009.06.011).

Record type: Article

Abstract

A detailed investigation into the performance of two flow injection-chemiluminescence (FI-CL) manifolds (with and without a preconcentration column) for the determination of sub-nanomolar dissolved iron (Fe(II) + Fe(III)), following the reduction of Fe(III) by sulphite, in seawater is described. Kinetic experiments were conducted to examine the efficiency of reduction of inorganic Fe(III) with sulphite under different conditions and a rigorous study of the potential interference caused by other transition metals present in seawater was conducted. Using 100M concentrations of sulphite a reduction time of 4 h was sufficient to quantitatively reduce Fe(III) in seawater. Under optimal conditions, cobalt(II) and vanadium(IV)/(III) were the major positive interferences and strategies for their removal are reported. Specifically, cobalt(II) was masked by the addition of dimethylglyoxime to the luminol solution and vanadium(IV)was removed by passing the sample through an 8-hydroxyquinoline column in a low pH carrier stream. Manganese (II) also interfered by suppression of the CL response but this was not significant at typical open ocean concentrations.

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Published date: 2009

Identifiers

Local EPrints ID: 69597
URI: http://eprints.soton.ac.uk/id/eprint/69597
ISSN: 0003-2670
PURE UUID: 1629c315-d5b9-4b52-a821-4db7076393c6

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Date deposited: 16 Nov 2009
Last modified: 19 Jul 2017 00:11

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Contributors

Author: Simon J. Ussher
Author: Angela Milne
Author: William M. Landing
Author: Kakar Attiq-ur-Rehman
Author: Marie J.M. Séguret
Author: Toby Holland
Author: Abdul Nabi
Author: Paul J. Worsfold

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