▎ 摘　　要

To achieve the accurate determination of trichloroacetic acid (TCA) in water chlorination, the sensitive electrochemical biosensor, Nafion/myoglobin-sodium alginate-graphene composite modified carbon ionic liquid electrode (Nafion/Mb-SA-GR/CILE), was fabricated by the electrodeposition method. Spectroscopic results implied that Mb could keep its biological activity in the SA-GR composite film. Direct electrochemistry of Nafion/Mb-SA-GR/CILE indicated that direct electron transfer of Mb was realized on the modified electrode, which was attributed to the synergistic effects of SA-GR composite film with excellent electrocatalytic capability and good biocompatibility. Furthermore, the modified electrode displayed good electrocatalytic ability towards TCA with the linear range from 7.5 to 69.0 mmol/L and a low detection limit of 0.163 mmol/L (3 sigma). Meanwhile, the modified electrode possessed good stability, reproducibility and excellent accuracy for the detection of tap-water, exhibiting great potentials for electroanalysis and electrocatalysis applications.