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Shipboard analytical intercomparison of dissolved iron in surface waters along a north-south transect of the tropical Atlantic Ocean

Shipboard analytical intercomparison of dissolved iron in surface waters along a north-south transect of the tropical Atlantic Ocean
Shipboard analytical intercomparison of dissolved iron in surface waters along a north-south transect of the tropical Atlantic Ocean
A shipboard analytical intercomparison of dissolved (<0.2 m) iron in the surface waters of the Atlantic Ocean was undertaken during October 2000. A single underway surface (1–2 m) seawater sampling and filtration protocol was used, in order to minimise differences from possible sample contamination. Over 200 samples (1/h) were collected over 12 days and analysed immediately using four different analytical methods, based on three variants of flow injection with luminol chemiluminescence (FI–CL) and cathodic stripping voltammetry (CSV). Dissolved iron concentrations varied between 0.02 and 1.61 nM during the intercomparison. On average, CSV [Electroanalysis 12 (2000) 565] measured 0.08 nM higher iron concentrations than one FI–CL method [Anal. Chim. Acta 361 (1998) 189], which measured 0.13 nM higher iron values than the other two [Anal. Chem. 65 (1993) 1524; Anal. Chim. Acta 377 (1998) 113]. Statistical analyses (paired two-tailed t-test) showed that each analytical method gave significantly different dissolved iron concentrations at the 95% confidence interval. These data however, represent a significant improvement over earlier intercomparison exercises for iron. The data have been evaluated with respect to accuracy and overall inter-laboratory replicate precision, which was generally better than the 95% confidence intervals reported for the NASS Certified Reference Materials. Systematic differences between analytical methods were probably due to the extraction of different physico-chemical forms of iron during preconcentration, either on the micro-column resin (in the FI methods) or with competing ligand equilibration (in the CSV method). Small systematic concentration differences may also have resulted from protocols used for quantification of the analytical blank and instrument calibration.
Dissolved iron, Seawater, Analytical intercomparison, Atlantic Ocean
0304-4203
19-34
Bowie, A.R.
9e60fe12-98c0-4ea7-9c2f-126a997a9f7b
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Blain, S.
45cb2a77-ae57-4524-a737-350f43cedb7e
Boyé, M.
89911d43-8547-49cd-8d69-1d4080b85475
Croot, P.L.
25daf592-4186-462b-b0fd-24c70d3fd605
Laan, P.
bbf648a3-0a1e-4d95-8dc6-9e08ea200e18
Sarthou, G.
06d8eba4-f933-4093-a5f3-4e4c8bf602ef
De Baar, H.J.W.
c23aa060-a4a6-4fb6-a4ed-892b022d2410
Worsfold, P.J.
2edcddc5-ce8e-4f9f-8628-216a26921979
Bowie, A.R.
9e60fe12-98c0-4ea7-9c2f-126a997a9f7b
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Blain, S.
45cb2a77-ae57-4524-a737-350f43cedb7e
Boyé, M.
89911d43-8547-49cd-8d69-1d4080b85475
Croot, P.L.
25daf592-4186-462b-b0fd-24c70d3fd605
Laan, P.
bbf648a3-0a1e-4d95-8dc6-9e08ea200e18
Sarthou, G.
06d8eba4-f933-4093-a5f3-4e4c8bf602ef
De Baar, H.J.W.
c23aa060-a4a6-4fb6-a4ed-892b022d2410
Worsfold, P.J.
2edcddc5-ce8e-4f9f-8628-216a26921979

Bowie, A.R., Achterberg, E.P., Blain, S., Boyé, M., Croot, P.L., Laan, P., Sarthou, G., De Baar, H.J.W. and Worsfold, P.J. (2003) Shipboard analytical intercomparison of dissolved iron in surface waters along a north-south transect of the tropical Atlantic Ocean. Marine Chemistry, 84 (1-2), 19-34. (doi:10.1016/S0304-4203(03)00091-4).

Record type: Article

Abstract

A shipboard analytical intercomparison of dissolved (<0.2 m) iron in the surface waters of the Atlantic Ocean was undertaken during October 2000. A single underway surface (1–2 m) seawater sampling and filtration protocol was used, in order to minimise differences from possible sample contamination. Over 200 samples (1/h) were collected over 12 days and analysed immediately using four different analytical methods, based on three variants of flow injection with luminol chemiluminescence (FI–CL) and cathodic stripping voltammetry (CSV). Dissolved iron concentrations varied between 0.02 and 1.61 nM during the intercomparison. On average, CSV [Electroanalysis 12 (2000) 565] measured 0.08 nM higher iron concentrations than one FI–CL method [Anal. Chim. Acta 361 (1998) 189], which measured 0.13 nM higher iron values than the other two [Anal. Chem. 65 (1993) 1524; Anal. Chim. Acta 377 (1998) 113]. Statistical analyses (paired two-tailed t-test) showed that each analytical method gave significantly different dissolved iron concentrations at the 95% confidence interval. These data however, represent a significant improvement over earlier intercomparison exercises for iron. The data have been evaluated with respect to accuracy and overall inter-laboratory replicate precision, which was generally better than the 95% confidence intervals reported for the NASS Certified Reference Materials. Systematic differences between analytical methods were probably due to the extraction of different physico-chemical forms of iron during preconcentration, either on the micro-column resin (in the FI methods) or with competing ligand equilibration (in the CSV method). Small systematic concentration differences may also have resulted from protocols used for quantification of the analytical blank and instrument calibration.

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More information

Published date: 2003
Keywords: Dissolved iron, Seawater, Analytical intercomparison, Atlantic Ocean

Identifiers

Local EPrints ID: 12534
URI: https://eprints.soton.ac.uk/id/eprint/12534
ISSN: 0304-4203
PURE UUID: 4cd9eb08-1797-4bd4-a6e0-a022263b7b65

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Date deposited: 26 Nov 2004
Last modified: 05 Oct 2018 12:04

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