A Comparison between Four Analytical Methods for the Measurement of Fe(II) at Nanomolar Concentrations in Coastal Seawater.
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Hopwood, Mark J.
Birchill, Antony J.
Achterberg, Eric P.
Klar, Jessica K.
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Dissolved Fe(II) in seawater is deemed an important micronutrient for microbial organisms, but its analysis is challenging due to its transient nature. We conducted a series of Fe(II) method comparison experiments, where spikes of 5 to 31 nMFe(II) were added to manipulated seawaters with varying dissolved oxygen (37 to156μM) concentrations. The observed Fe(II) concentrations from four analytical methods were compared: spectrophotometry with ferrozine, stripping voltammetry, and flowinjection analysis using luminol (with, and without, a pre-concentration column). Direct comparisons between the different methods were undertaken from the derived apparent Fe(II) oxidation rate constant (k1). Whilst the two luminol based methods produced the most similar concentrations throughout the experiments, k1 was still subject to a 20–30%discrepancy between them. Contributing factors may have included uncertainty in the calibration curves, and different responses to interferences from Co(II) and humi.....
JournalFrontiers in Marine Science
Sustainable Development Goals (SDG)14.A
Best Practice TypeManual (incl. handbook, guide, cookbook etc)
CitationHopwood, M.J.; Birchill, A.J.; Gledhill, M.; Achterberg, E.P.; Klar, J.K. and Milne, A. (2017) A Comparison between Four Analytical Methods for the Measurement of Fe(II) at Nanomolar Concentrations in Coastal Seawater. Frontiers in Marine Science, 4:192, 14pp. DOI: 10.3389/fmars.2017.00192
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