Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 178, Issue -, Pages 339-342Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.12.109
Keywords
Porous screen-printed carbon electrode; Bismuth film; Stripping voltammetry; Lead(II); Cadmium(II)
Funding
- Science and Technology Commission of Shanghai Municipality (STCSM) [10391901600]
- Ministry of Education of the People's Republic of China [WK1014051]
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Here we report a new disposable bismuth-coated porous screen-printed carbon electrode (Bi-P-SPCE) for trace heavy metal ions detection. The Bi-P-SPCE was fabricated by two processes: firstly, the porous screen-printed carbon electrode (P-SPCE) was prepared by combing a printing procedure of a graphite-based layer doped with CaCO3 powders with a subsequent dissolution of these powders; secondly, a Bi film layer was formed on the P-SPCE by in situ electrodepositing Bi(III) along with accumulating analytes. Due to the rough surface, large active area and low background noise of P-SPCE, the electrode exhibited significantly enhanced sensitivity, for lead(II) and cadmium(II) detection compared to screen-printed carbon electrode (SPCE) and glassy carbon electrode (GCE). With a preconcentration at -1.2 V (vs. Ag/AgCl) for 300 s, the detection limits obtained on the proposed Bi-P-SPCE are 0.03 mu g/L and 0.34 mu g/L (S/N = 3) for lead(II) and cadmium(II), respectively. This easy-to-prepare and low-cost electrode was also successfully applied to real water sample analysis. (c) 2013 Elsevier B.V. All rights reserved.
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