Hi @DkFran

At this concentrations, it should not be too much of a problem to measure Pb, even though GC electrodes are not very sensitive. Is -400mV a low enough potential to accumulate Pb onto the electrode ? Have you tried at -0.8V?
Also, I don't know if there is Cu in your solution but I remember having some disappearance of the Pb signal with addition of Cu.

If it doesn't work, maybe try a gold electrode which is a bit more sensitive to Pb. Or maybe modify your GC electrode by depositing some bismuth on the surface.

Good luck!

Which electrodes are you using, which parameters for your scan, what's the limit of detection you are trying to reach?

I am planning to eventually use the Cheapstat for field analysis of Zn, Pb, Cu and Cd but for now we develop the methods with a better potentiostat. I'll try to report here when I have some results.

I see.
I'll play with the potential of my reference electrode to shift my potential range then.
Thanks

Hi Will
So in the basic configuration, it is possible to use a potential from -1.65 to +1.65 ? I tough it was limited to -1 to +1V. Is it just a question of display on the screen that goes back to 0 after 990 mV ?

Thanks. .

Thanks Will. I'll keep that in mind.
Would you have any feedback on the improvement with such a filter ?

Hello
I was wondering what is the LP/NF switch on the board that needs a jumper ? Any idea anyone ?
Thanks