A Ni(II)tetrakis(4-sulfonatophenyl) porphyrin (NiTPPS)|carbon nanotube composite electrode that shows strong catalytic and antifouling capability was developed to detect a series of phenolic endocrine compounds including bisphenol A, nonylphenol and ethynylestradiol. This electrode was fabricated by electropolymerizing NiTPPS complexes on a carbon nanotube-modified glassy carbon electrode. Optimized experimental parameters including a hydrodynamic potential of 0.7V for flow injection analysis (FIA) and a NiTPPS surface coverage of 2.2nmolcm-2 (standard deviation 0.2nmolcm-2; n=6) were obtained for detection of the endocrine disrupting compounds. The sensor responded well to all the tested compounds with limits of detection ranging from 15nmolL-1 to 260nmolL-1 (based on three times S/N ratio) under FIA conditions. Both carbon nanotubes and NiTPPS account for the excellent performance of the composite modified electrode.
- Carbon nanotubes
- Electrochemical detection
- Electrochemical impedance spectroscopy
- Endocrine disrupting compounds
- Flow injection analysis
- Ni(II)tetrakis(4-sulfonatophenyl) porphyrin