Marine Chemistry, 20 February 2012, Vol.130-131, pp.21-27
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 (fer) ] -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 (R = 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). ►Ferene was used for the in situ determination of Fe(II). ►Calibration experiments have been carried out in the nanomolar range (R = 0.959). ►A detection limit of 20 nM was obtained. ►Investigations were performed in situ with a wet chemical analyzer. ►Results were consistent with measurements made by ICP-OES.
Seawater ; Redoxcline ; Ferene ; In Situ Measurements ; Iron(II) Sensor ; Speciation ; Oceanography ; Chemistry
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