Optimisation of parameters for detection of manganese ion using electrochemical method

摘要

An electrochemical method was detected a heavy metal ion of manganese(Mn~(2+))based on bare gold electrode(AuE).The bare AuE was optimized including various type of electrolytes,redox indicators,pit,scan rate and accumulation time using cyclic voltammetry(CV).From the CV results,the optimal conditions of Mn~(2+)were found oi Tris-HCl(0.1 M,pi I 2)buffer for electrolytes supported by 5 mM Prussian blue as a redox indicator with scan rate of 100 mVs~(-1)and accumulation time of 2 s,respectively.Differential pulse voltammetry(DPV)method was detected with different concentrations of Mn~(2+)on the ranged from 0.05 to 1.0 ppm with limit of detection(LOD)of 0.075 mg L~(-1)(S/N=3).A linear regression was found of 0.9659(r~2).The above results indicated that the bare AuE was unable to detect of Mn~(2+)below safety level.So,the proposed method suggests to detect below safety level of Mn~(2+)based on the further modification of AuE with high sensitivity,selectivity and accuracy.