Determination of low levels of cadmium ions by the under potential deposition on a self-assembled monolayer on gold electrode.

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The electrochem. detn. of low levels of Cd using a self-assembled monolayer (SAM) modified Au electrode is reported. Detn. was based on the stripping of Cd, which was deposited by under potential deposition (UPD). Short alkanethiol SAMs bearing different end groups, i.e., sulfonate, carboxylate and ammonium, were examd. Lowest level of detection (∼50 ng/L-1) was achieved with a 3-mercaptopropionic acid (MPA) monolayer using subtractive anodic square wave voltammetry (SASV). Addnl. surface methods, namely, reductive desorption and XPS, were applied to det. the interfacial structure of the electrodeposited Cd on the modified electrodes. The deposited Cd forms a monoat. layer, which bridges between the gold surface and the alkanethiol monolayer assocg. with both the gold and the sulfur atoms. [on SciFinder(R)]


CAPLUS AN 2010:1595370(Journal)