Development of an Electrochemical Sensing System for 6-Chloro-N,N-Diethyl-1,3,5-Triazine-2,4-Diamine (CAT) Utilizing an Amalgamated Gold Electrode and Artificial Sensor Receptor

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CAT is a triazine moiety that has been used as one of the most popular herbicides, and is reported to be an endocrine disrupting chemical. To detect aqueous CAT specifically at low concentrations regulated regally, an electrochemical sensing system for CAT was developed by coupling a molecularly imprinted polymer for CAT (CAT-MIP) packed column and an electrochemical analyzer. We have already reported the preparation of CAT-MIP as an artificial sensor receptor. In order to establish the electrochemical sensing system of CAT, we fabricated an amalgamated gold electrode which was alloyed with mercury. The amalgamated gold electrode could detect the largest reductive current of CAT at pH 3.0 in 0.1 M KCl, up to 30 µM. The detection procedure of this sensing system is composed of a solid phase extraction with the CAT-MIP column and electrochemical determination of CAT in the eluent from the column. With the sensing system, CAT was detected specifically in aqueous samples by washing non-specific adsorption to the CAT-MIP column with dichloromethane. Fifteen nM of CAT, as legally regulated in Japan, was detected with the system.
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