Modification of gold electrode by self-assembled 2-mercapto benzothiazole for the determination of Hg~(2+)

摘要

An electrochemical method was developed for the determination of mercury using polycrys-talline gold electrode modified by self-assembled monolayers (SAMs) of 2-mercaptoben-zothiazole (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 Hg~(2+). The limit of detection for the determination of Hg~(2+) using the MBTH SAMs modified gold electrode was obtained as 0.421 μg L~(-1). The pre-concentration of Hg~(2+) at open circuit potential is beneficial for the onsite monitoring of mercury concentration in water samples.