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. l-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 l-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.
Titolo: | Copper-cobalt hexacyanoferrate modified glassy carbon electrode for an indirect electrochemical determination of mercury |
Autore/i: | SHARMA, VIVEK VISHAL; TONELLI, DOMENICA; GUADAGNINI, LORELLA; GAZZANO, MASSIMO |
Autore/i Unibo: | |
Anno: | 2017 |
Rivista: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.snb.2016.07.005 |
Abstract: | 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. l-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 l-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. |
Data stato definitivo: | 2017-06-15T12:26:39Z |
Appare nelle tipologie: | 1.01 Articolo in rivista |