The interaction of adrenaline with phosphoric acid is investigated by cyclic voltametric (CV)approach. The impact of H2SO4 and HCl solution on adrenaline is not obvious. In NaAC-HACsolution, B.R. solution, and phosphate buffer solution, the oxidation peak current (ipa1) and peakpotential (Epa1) change with the pH values. In the H3PO4 system with pH>4, the oxidation peak 1 ofadrenaline at graphite electrode will transform to two peaks. The impacting factors for the changeinclude the concentration of adrenaline, the electrode material, and the pH value and the compositionof solution.
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