Shipboard analytical intercomparison of dissolved iron in surface waters along a north-south transect of the Atlantic Ocean
- Bowie, A. R.
- Achterberg, Eric P.
- Blain, S.
- Boye, M.
- Croot, Peter
- De Baar, H. J. W.
- Laan, P.
- Sarthou, G.
- Worsfold, P. J.
DOIAbstract
A shipboard analytical intercomparison of dissolved (<0.2 μm) 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. ...
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