Determination of Trace Amount of Mercury Using Poly(p-Aminobenzene Sulfonic Acid)/Graphene Modified Glassy Carbon Electrode

Abstract

A poly(p-aminobenzene sulfonic acid)/graphene composite modified glassy carbon electrode(GCE) was fabricated and the electrochemical behaviors of mercury on the modified electrode were investigated.The results show that the electrochemical response of Hg2+ at the modified electrode is significantly improved compared with the bare GCE.After 5 min accumulation at-1.2 V in a 0.1 mol/L pH=4.0 PBS,the peak currents vary linearly with the concentration of Hg2+ over the range from 1.0×10-6 to 5.0×10-4 mol/L with the detection limit of 5.0×10-7 mol/L.The correlation coefficiency is 0.995.Using this modified electrode,trace amounts of Hg2+ in water samples are determined with recoveries of 92.2%~105.2%.