We use our voltammetry system primarily to investigate natural and artificial metal-ligand equilibria. A common approach is competitive ligand equilibration-adsorptive cathodic stripping voltammetry (CLE-ACSV). For this method, a natural water sample is titrated with increasing amounts of a trace metal (for example, Cu or Fe) until the contained ligands are saturated. Exchangeable and excess metal ions are captured by an added, known ligand (for example, salicylaldoxime, SA) which forms a complex detectable by voltammetry. Based on the resulting titration curve, (bulk) conditional stability constants and complexing capacities of natural water samples can be derived.
List of people involved:
H. Waska, A. Koschinsky, and T. Dittmar (2016) Fe- and Cu-complex formation with artificial ligands investigated by ultra-high resolution Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS): Implications for metal-organic complex studies. Front. Mar. Sci. 3, 119.
H. Waska, A. Koschinsky, M. J. R. Chancho, and T. Dittmar (2015) Investigating the potential of solid-phase extraction and Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) for the isolation and identification of dissolved metal-organic complexes from natural waters. Mar. Chem. 173: 78-92.
Dr. Hannelore Waska
0441 - 798 3348