The authors discuss the voltammetric methods that are used to assess metal–…

• Introduction
• Experimental
• Results and discussion
• Conclusion
• References
• Figures

Biology Articles » Hydrobiology » Marine Biology » Metal–organic complexation in the marine environment » Conclusion

Conclusion

- Metal–organic complexation in the marine environment

The ASV and CSV-CLE methods for the determination of organic-metal complexation give similar results for K_{cond ML}and ligand concentration. These data relate to the ligand in excess to the metal in solution. ASV titrations have a larger K_{cond ML} window than CSV-CLE, which can be varied by changing the competing ligand concentration. The excess ligand may or may not be the same as the actual ligand in the metal–ligand complex in the sample. The pseudovoltammogram method gives K_therm and ligand concentration data on the actual complex(es) in solution within the window limited by the reduction of sodium ion. The data from the titration methods and the pseudovoltammogram data are not necessarily similar as shown for Zn. For Fe(III), the choice of competitive ligand for the CSV-CLE methods does not appear to affect the log K_{cond Fe(III)L} data. The kinetic approach also agrees with the CSV-CLE methods. These similarities are due to measuring the same ligand types; i.e. excess ligand to the metal in the sample.