Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 238, Issue -, Pages 9-15Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.07.005
Keywords
Mercury; Hexacyanoferrates; Glassy carbon; L-cysteine; Interfering species
Funding
- University of Bologna
- European Commission (Erasmus Mundus Action 2 India 4EU II)
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An electrochemical sensor based on a glassy carbon electrode modified with a hybrid film of copper cobalt hexacyanoferrate was prepared for the indirect electrochemical determination of Hg2+. It exploits the formation of a redox inactive complex with thiols. t-cysteine and 1,4-butanedithiol were used, with the former giving more sensitive results. Interference studies were carried out which led to Cu2+ being the major interferent. Exploiting the fact that the response of t-cysteine to Hg2+ is much more rapid compared to Cu2+, the interference from Cu2+ was avoided or minimized by quick measurement of the amperometric current after the addition of the analyte. The modified electrode showed promising results in detecting Hg2+ in spiked mineral water samples. (C) 2016 Elsevier B.V. All rights reserved.
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