STUDY OF ADSORPTIVE VOLTAMMETRY FOR ADRENALINE ON CARBON PASTE ELECTRODE

Adrenaline is determined by adsorptive voltammetry using a carbon paste electrode in a base solution of 0.5 mol·L^-1 H₂SO₄. The peak potential of anode is 0.58 V (vs.SCE). There is a good linear relationship between the peak current and the concentration of adrenaline in the range of 5.0×10^-9～1.0×10^-4 mol·L^-1. The detection limit of the method is 2.5×10^-9 mol·L^-1. The recovery is 93.75%～103.33%, and the relative standard deviation is 3.1% (n=12). The adrenaline hydrochloride injection has been determined with good results by this method. The possible reaction mechanism is discussed. The electrode reaction of adrenaline is irreversible process with two electrons and two protons on the carbon paste electrode.