Potassium permanganate based potentiometric titration of electrolyte of VRB

The analysis of the state and the concentration of vanadium ions provided an important evidence for determining the state of charged vanadium ions,the capacity of battery and the charge-discharge efficiency.The potentiometric titration method was established to determine the vanadium electrolyte through KMnO4-(NH4)2Fe(SO4)2 system.The proposed method was used to analyze the single and mixed valence state of V(Ⅱ),V(Ⅲ),V(Ⅳ),V(Ⅴ) and total concentration of vanadium ions in electrolyte.The results showed that RSD(N=5) based on the proposed method was no more than 3.67%.