I uses arc discharge method to produce nanosilver in pure water and in citrate solution. I don't have an auto-titrator.
We was tested this method – it works very well but only if there is no complexing - chelating agents in solution. For example citrates used very often during AgNP synthesis as stabilizers shift (change) electrode potential.
Practically this measurements was difficult with big error – of course it is our experience. Probably somebody with experience in electrochemical methods maybe solve this problems.
I found in paper "Discovery of ionic silver in silver nanoparticles suspension fabricated by arc discharge method" Tien et al. (J Alloys and Compounds 463 (2008) 408-411) method using centrifuge and AAS spectrometer. I am going to try this one but I afraid that can be problem with fraction of small particles (around 5-10 nm)
You should do in advance a calculation of necessary centrifugation time based on Stokes law and centrifugal acceleration available.
Today, finally, I tried to measure the number of ions using colloid centrifugation and then use AAS. The results are quite promising so I think the method works.
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