▎ 摘　　要

Dichlorophen (Dcp), a harmful environmental pollutant, is broadly utilized in veterinary medications, chemical fertilizers, pesticides, cosmetics, and personal care products. The current work reports a low-cost, simple, and convenient technique to achieve an electrochemical sensor relying on the electropolymerization of poly-L-arginine (PLA) on carboxyl-functionalized graphene oxide (COOH-GO)-modified GCE for the detection of Dcp. The stepwise assembly procedure and electrochemical characteristics of the fabricated sensor were studied by FTIR, FESEM, EIS, and CV. The resulting PLA/COOH-GO-modified electrode showed a well-defined irreversible peak to Dcp with a broad linear range over 0.01-1.5 and 1.5-60 mu M with a low detection limit of 3 nM. Finally, the fabricated sensor was successfully utilized for the quantitation of Dcp in spiked river water with satisfying results. This sensor also displayed desirable anti-interference performance and long-term stability.