There are two interference peaks in 1X PBS by DPV methods in three-electrode system which locate in 0.274V and 0.517v.
PBS was purchased from J&K Scientific Ltd which was blowed by nitrogen for 3 minutes before test in order to remove oxygen . And my working electrode was gold electrode made by sputtering. Ag/AgCl electrode was used as reference electrode.
Is there anyone could help me explain this phenomenon?