In situ determination of iron(II) in the anoxic zone of the central Baltic Sea using ferene as spectrophotometric reagent

Meyer, David, Prien, Ralf D., Dellwig, Olaf, Connelly, Douglas P. and Schulz-Bull, Detlef E. (2012) In situ determination of iron(II) in the anoxic zone of the central Baltic Sea using ferene as spectrophotometric reagent. Marine Chemistry, 130-131, 21-27. (doi:10.1016/j.marchem.2011.12.002).

Abstract

Continuous flow analysis for soluble Fe(II) species in seawater was performed with a colorimetric method using ferene as a spectrophotometric reagent. The method is based on the measurement of absorbance of the [Fe^II(fer)₃]⁴ --complex at 594 nm. No preconcentration-steps are required. Samples prepared in the laboratory in line with external calibration experiments have been successfully analyzed in the nanomolar range (R² = 0.959). A detection limit of 20 nM was obtained. Furthermore, investigations were performed in situ with a wet chemical analyzer in the water column of the central Baltic Sea. Finally the results were consistent with measurements made by an independent laboratory based method (ICP-OES).

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