Detection of heavy metal ions in drinking water using a high-resolution differential surface plasmon resonance sensor.
We have built a high-resolution differential surface plasmon resonance (SPR) sensor for heavy metal ion detection. The sensor surface is divided into a reference and sensing areas, and the difference in the SPR angles from the two areas is detected with a quadrant cell photodetector as a differential signal. In the presence of metal ions, the differential signal changes due to specific binding of the metal ions onto the sensing area coated with properly selected peptides, which provides an accurate real-time measurement and quantification of the metal ions. Selective detection of Cu2+ and Ni2+ in the ppt-ppb range was achieved by coating the sensing surface with peptides NH2-Gly-Gly-His-COOH and NH2-(His)6-COOH. Cu2+ in drinking water was tested using this sensor.
Forzani
Erica S
ES
Department of Electrical Engineering & The Center for Solid State Electronics Research, Arizona State University, Tempe, Arizona 85287, USA.
Zhang
Haiqian
H
Chen
Wilfred
W
Tao
Nongjian
N
D004784:Environmental Monitoring / Q000379:methods*; D007477:Ions / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance; D014873:Water Pollutants / Q000032:analysis*
D007477:Ions; D019216:Metals, Heavy; D014873:Water Pollutants