Hello everyone, currently I am working with square wave voltammetry for detection with screen printed electrodes that are conformed by a carbon working electrode, a carbon counter electrode and Ag as reference (or pseudoreference according to bibliography). Whithout chlorides I am able to detect my analyte very well without problem, but when I introduce Chlorides in the mix, my peak is moved to another potencial (I assum that is due to the fact of a higher conductivity in the mix) and it becomes wider, so much, that is not possible to detect it. My question is: Does this occur because Chlorides are affecting the migration of my molecule to the working electrode? or maybe Does this occur because Chlorides are affecting to my working electrode? In whatever of both cases, how can I fix this situation?
I have been trying to find an answer to this issue in bibliography, but I failed several times in this... I would be very grateful if someone is able to help me!
Dear Michal Hanko ,
thank you so much for your answer, I am going to try your recomendation. However, what you are saying, resolves potential change issue, but no the change in the peak when I add electrolyte to my mix, I guess? I don´t understand why my SWV peak turns wider if I add electrolyte to the matrix... If you are able to explain me why this occur, I will very greatefull with you! Anyway, thank you so much for the help again!
Dear Isabel Maria,
In fact, your solution becomes charged with ions when you add the chlorides, and so the ionic strength of the solution becomes significant, which is why the migration of molecules towards the working electrode is impeded
Dear Naima Ghemmit-Doulache ,
thank you so much for your answer! I understand my SWV peak now... Do you know if there is some way to fix this issue?
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