Anodic stripping voltammetric determination of traces of mercury with a chemically modified electrode

Oxypalladation Initiating the Oxid­ative Heck Reaction with Alkenyl ­Alcohols: Synthesis of Isocoumarin–Alkanones

“…As shown in Table 1, both LOD and LOQ were at the level of μg L −1 for all considered sensors. In comparison with previous results achieved at other crown ether‐modified electrodes, the LODs provided by CB‐18‐crown‐6‐GEC and CB‐15‐crown‐5‐GEC sensors were similar than the LOD obtained using a ferrocenoylpolythia crown ether—Nafion‐modified glassy carbon electrode 13, and much lower than the LOD achieved using a carbon‐paste electrodes modified with 18‐crown‐6 12. It must be point out that in this work an enrichment time of 300 s was selected looking for a compromise between the peak currents and the time of the analysis, nevertheless lower concentrations ranges and better detection limits could easily be achieved using the proposed method by increasing the enrichment time.…”

“…The three‐sensor array was firstly analytical studied for the determination of Hg(II) providing a well‐shaped stripping peak over the considered concentration range. The achieved LODs and LOQs were at levels of µg L −1 , which are similar or even much lower to those obtained for the determination of Hg(II) with other crown ether‐modified electrodes 12–13.…”

“…Although some studies devoted to the application of crown ether‐modified electrodes for the individual determination of lead 9–11, mercury 12, 13, silver 14, thallium 15, palladium 16 and copper 17 can be found in the literature, related works entailing the simultaneous determination of different heavy metal ions are scarce 6.…”

Crown ether-modified electrodes for the simultaneous stripping voltammetric determination of Cd(II), Pb(II) and Cu(II)

“…Particularly, crown ethers are well-known to form complexes with alkaline ions, alkaline earth metals, lanthanides and transition metal ions. Surprisingly, studies devoted to complexation with transition metal ions are scarce and only few works using crown ether-modified electrodes are published for the determination of lead [5][6][7], mercury [8,9], silver [10], thallium [11], palladium [12] and copper [13].…”

Comparing Different Approaches for Assembling Selective Electrodes for Heavy Metals

“…In many cases a matrix in the form of a polymer is required for hosting this function. Other examples include ferrocenoylpolythia crown ether-Na®on [11], Na®on-Schiff base [12], 1,10-phenanthroline-Na®on [13], 2,2 H -bipyridine-Na®on [14] and Na®on [15] modi®ed electrodes for the selective determination of mercury [11,12] and iron [13±15]. Na®on, a non-crosslinked per¯uoroalkylsulfonate cation exchange resin has been used for electrode coating in a large variety of electrochemical studies, mostly in conjunction with immobilization of positively charged redox couples [7].…”