THE APPLICATION OF CHELATING AGENT INCORPORATED POLYMER-MODIFIED ELECTRODES IN THE DETECTION OF TRACE-METALS

The use of chelating agent-modified Nafion(R)-coated mercury-film elec trodes (CNCMFEs) in square wave anodic stripping voltammetry (SWASV) f or the determination of trace metals is described. The CNCMFE containi ng appropriate amounts of dimethylglyoxime (DMG) was applied for the d etermination of Ni(II), Cd(II), and Cu(II). A similar system that cont ains 2,2'-bipyridyl (Bpy) was used for the determination of Pb(II). Th e effect of various model organic substances on the CNCMFEs in SWASV i s thoroughly explored. The CNCMFEs are considerably more resistant to organic interferences than the Nafion(R)-coated MFE. The implications of these interferences for the reliability and feasibility of strippin g measurements using the CNCMFEs in real samples are discussed. Result s presented for real samples demonstrate the analytical utility of the CNCMFEs in SWASV.