Direct Electroanalysis of p ‐Nitrophenol (PNP) in Estuarine and Surface Waters by a High Sensitive Type C/ p ‐NiTSPc Coating Carbon Fiber Microelectrode (CFME)

We report for the first time on the elaboration of a remarkable sensitivity type C/ p ‐NiTSPc carbon fiber microelectrode (CFME) for p ‐nitrophenol (PNP) pollutant. We observed the best performances using square wave voltammetry (SWV) technique in the place of differential pulse voltammetry (DPV). Also the combination of p ‐NiTSPc optimized cycles of electrodeposition and accumulation time, helped us to increase remarkably the sensor slope (320 times) and the limit of detection ( LOD ) (1000 times), with a final LOD of 0.1 µg/L, the current regulatory limit for drinkable waters. Furthermore the recoveries of the standards added are close to 100 % indicating that the method has some suitability. The proposed voltammetric procedure might be applied for organophosphorus pesticides and their by‐products with a remarkable sensing in natural polluted waters.