Voltammetric behavior and trace determination of cadmium at a calixarene modified screen-printed carbon electrode
Honeychurch, K. C., Hart, J. P., Cowell, D. C. and Arrigan, D. W. (2002) Voltammetric behavior and trace determination of cadmium at a calixarene modified screen-printed carbon electrode. Electroanalysis, 14 (3). pp. 177-185. ISSN 1040-0397
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Publisher's URL: http://dx.doi.org/10.1002/1521-4109(200202)14:3<17...
Screen-printed carbon electrodes (SPCEs) have been evaluated for the anodic stripping voltammetric determination of cadmium using open circuit accumulation facilitated by two different calixarenes: a novel thiolated calixarene, calixarene (I), (5,11,17,23,tetra-tert-butyl-25,26,27,28-tetrakis(2-mercaptoethoxy)-calixarene), and a commercially available calixarene (II) (25,26,27,28-tetrahydroxyl-calix arene). This approach has the advantage that the medium exchange technique can be applied to reduce the possibility of potential electroactive interferents. In the present method, following medium exchange to a clean electrolyte, differential pulse voltammetry was employed in the measurement. This combination resulted in a detection limit of 2.8 ngmL(-1) and a linear calibration range up to 350 ngmL ' Cd2+. There was no interference from Cr3+, Hg2+ and Zn2+, but a decrease in signal was obversed when Pb2+ and Cu2+ were present. The screen-printed sensor modified with calixarene (I) was successfully employed for the determination of Cd2+ in a spiked river water sample.