Thin functionalized films on cylindrical microelectrodes for electrochemical determination of Hg(II).

Citation:

Lea Fink and Mandler, Daniel. . 2010. “Thin Functionalized Films On Cylindrical Microelectrodes For Electrochemical Determination Of Hg(Ii).”. J. Electroanal. Chem.journal Of Electroanalytical Chemistry, 649, Pp. 153 - 158.

Abstract:

Cylindrical carbon fiber microelectrodes (CFMEs) were used for the detn. of Hg(II) in aquatic solns. using anodic stripping voltammetry (ASV). Optimizing the parameters, such as the potential and time of deposition, resulted in linear response of the fiber over a large range of Hg(II) concns. (5 × 10-8 - 1 × 10-5 M). Furthermore, three methods of modification of glassy carbon and CFMEs with thiol or other Hg(II)-complexing groups, have also been examd. Electrodes were modified by electrochem. reducing 4,4’-disulfanediyldibenzenediazonium, followed by redn. of the disulfide bond, by electrodepositing sol-gel based on 3-mercaptopropyltrimethoxysilane and by spin-coating or adsorbing cellulose acetate thin films in which 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane (Kryptofix 22DD) was incorporated. We found that all modified glassy carbon electrodes extd. Hg(II) under open-circuit potential, however, only the cylindrical microelectrode modified via the electrochem. redn. of the diazonium was capable of extg. mercuric ions. The interference of Pb(II), Cd(II), and Cu(II) with the detn. of Hg(II) with 4,4’-disulfanediyldibenzenediazonium modified CFME was also studied. [on SciFinder(R)]