Contaminant detection device and method

An electrode assembly for measuring the concentration of contaminants within a fluid sample, the electrode assembly comprising:

• a first contact electrically coupled to a reference electrode;
• a second contact electrically coupled to a cysteine-functionalized graphene oxide with polypyrrole modified working electrode;
• and
• a third contact electrically coupled to a counter electrode.

A method for measuring contaminant concentration within a fluid sample using a contaminant detection device including an electrode assembly and a control unit, the method comprising:

• contacting, by the fluid sample, the electrode assembly, the electrode assembly including a reference electrode, a measurement electrode having a cysteine functionalized graphene oxide with polypyrrole nanocomposite, and a counter electrode;
• applying a first electrical signal to the measurement electrode from the control unit;
• applying a second electrical signal to the measurement electrode from the control unit;
• measuring an output signal across the reference electrode and the measurement electrode with the control unit while applying the second electrical signal;
• and
• determining a contaminant concentration based on the output signal.