Hi everyone,
I am trying to analyze heavy metals in water by differential pulse anodic stripping voltammetry (DPASV), using three electrodes: Carbon electrode, Ag/AgCl and platinum wire as working, reference and counter electrodes, respectively. Why there is interference between metals (Pb, Cd, Cu, Zn…)? And how can I avoid it? Can I have an answer please?
Please look at the following below links which may help you in your analysis:
https://www.osti.gov/servlets/purl/6504209/
https://link.springer.com/content/pdf/10.1007/s11270-020-04863-w.pdf
Thanks
In my opinion, the problem is not an interference. Probably the analyte concentrations are below the detection limit, and the measured signal is an impurity on the working electrode. Try first for each separate analyte to obtain signals proportional to the concentration.
You maybe forming intermetallic species on the surface of the electrode. The interaction between Zn and Cu is well known. Other peaks you see as well could be due to mono and multilayer formation and their subsequent stripping. I am assuming you are doing your stripping without a Bi or Hg film, i.e. depositing the target metal ions directly onto the carbon surface.
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