Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7147913 | Sensors and Actuators B: Chemical | 2014 | 7 Pages |
Abstract
Metal ions are the smallest imaginable templates in molecular imprinting. Herein, we report a conductance sensor measuring the real part of impedance at 200 Hz coated with a molecularly imprinted polymer (MIP) for the selective binding Cu2+ from aqueous solutions. For that purpose N-vinyl-2-pyrrolidone - a polymerizable ligand - is pre-assembled with Cu2+ and co-polymerized with ethylene glycol dimethacrylate. The material yields rapid dynamic response toward the presence of analyte within 1 min and a lower limit of detection of 0.02 mmol Lâ1. When using copper chloride for imprinting, highest sensitivity can be reached: sensor effects are almost one order of magnitude higher, than for copper acetate. Furthermore, the sensor exhibits almost four-fold selectivity toward other interfering bivalent ions, such as Ni2+, Zn2+ and Co2+ and nearly seven-fold selectivity toward Na+. The sensors were successfully tested for monitoring copper in spiked real water samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Sadia Zafar Bajwa, Ralf Dumler, Peter A. Lieberzeit,