Highly efficient electrocatalytic vapor generation of methylmercury based on the gold particles deposited glassy carbon electrode: A typical application for sensitive mercury speciation analysis in fish samples.

Author(s) Shi, M.T.; Yang, X.A.; Qin, L.M.; Zhang, W.B.
Journal Anal Chim Acta
Date Published 2018 Sep 26

A gold particle deposited glassy carbon electrode (Au/GCE) was first used in electrochemical vapor generation (ECVG) technology and demonstrated to have excellent catalytic property for the electrochemical conversion process of aqueous mercury, especially for methylmercury (CHHg), to gaseous mercury. Systematical research has shown that the highly consistent or distinct difference between the atomic fluorescence spectroscopy signals of CHHg and Hg can be achieved by controlling the electrolytic parameters of ECVG. Hereby, a new green and accurate method for mercury speciation analysis based on the distinguishing electrochemical reaction behavior of Hg and CHHg on the modified electrode was firstly established. Furthermore, electrochemical impedance spectra and the square wave voltammetry displayed that the ECVG reaction of CHHg may belong to the electrocatalytic mechanism. Under the selected conditions, the limits of detection of Hg and CHHg are 5.3 ng L and 4.4 ng L for liquid samples and 0.53 pg mg and 0.44 pg mg for solid samples, respectively. The precision of the 5 measurements is less than 6% within the concentration of Hg and CHHg ranging from 0.2 to 15.0 μg L. The accuracy and practicability of the proposed method was verified by analyzing the mercury content in the certified reference material and several fish as well as water samples.

DOI 10.1016/j.aca.2018.04.057
ISSN 1873-4324
Citation Anal Chim Acta. 2018;1025:5868.

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