▎ 摘　　要

NOVELTY - An electrochemical luminescence intensity system has graphene oxide-tetra(4-phenyl)porphyrin coated on glassy carbon electrode, and electrochemical luminescence system of graphene oxide-tetra(4-phenyl)porphyrin/potassium persulfate. The electrochemical luminescence intensity of electrochemiluminescence system before and after adding iron ion is measured. The natural logarithm value of ratio of electrochemical luminescence intensity before and after adding iron ion is calculated using the specified relation. USE - Electrochemical luminescence intensity system is used for detection of iron ion (Fe3+) in water and serum (all claimed). ADVANTAGE - The electrochemical luminescence intensity system has excellent stability. The iron ion is detected by simple method, using the electrochemical luminescence intensity system. DETAILED DESCRIPTION - An electrochemical luminescence intensity system has graphene oxide-tetra(4-phenyl)porphyrin coated on glassy carbon electrode, and electrochemical luminescence system of graphene oxide-tetra(4-phenyl)porphyrin/potassium persulfate formed using potassium persulfate as co-reactant of graphene oxide-tetra(4-phenyl)porphyrin. The electrochemical luminescence intensity of electrochemiluminescence system before and after adding iron ion (Fe3+) is measured. The natural logarithm value (ln(Io/I)) of ratio of electrochemical luminescence intensity before and after adding iron ion (Fe3+) is calculated using the relation: ln(I0/I')=0.002x C'(Fe3+)-0.035(3 nmol.L-1), where Io is electrochemical luminescence intensity strength before addition of iron ion (Fe3+), I' is luminescence intensity strength after addition of iron ion (Fe3+), C'(Fe3+) is concentration of iron ion (Fe3+) and correlation coefficient (R2) is 0.998.