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Modification of gold electrode by self-assembled 2-mercapto benzothiazole for the determination of Hg2+

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An electrochemical method was developed for the determination of mercury using polycrystalline gold electrode modified by self-assembled monolayers (SAMs) of 2-mercaptobenzothiazole (MBTH). Morphological and electrochemical characterisation of the self-assembled structure of MBTH was performed using atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS) measurements. The monolayer of MBTH has shown high affinity for Hg2+. The limit of detection for the determination of Hg2+ using the MBTH SAMs modified gold electrode was obtained as 0.421 μg L−1. The pre-concentration of Hg2+ at open circuit potential is beneficial for the onsite monitoring of mercury concentration in water samples.
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Keywords: 2- mercapto benzothiazole; gold electrode; mercury; self-assembled monolayes (SAMs); stripping voltammetry

Document Type: Research Article

Affiliations: Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India

Publication date: August 9, 2014

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