Simultaneous determination of trace uranium(VI) and zinc(II) by adsorptive cathodic stripping voltammetry with aluminon ligand

Highly Selective Adsorptive Cathodic Stripping Voltammetric Determination of Uranium in the Presence of Pyromellitic Acid

“…The main propose of this work is to describe a sensitive and free of interference AdSV procedure for trace measurement of uranium using pyromellitic acid as complexing agent. This ligand forms a complex with uranium and can be used as an accumulating agent free from the interferences which were reported previously [16,20,21,23,27]. This method makes use of a well-defined differential pulse voltammetric reduction peak resulting from stripping of the accumulated uranium-PMA complex on the mercury drop in the medium.…”

“…Different complexing reagents are already known for the determination of uranium by adsorptive stripping voltammetry [16 -28]. The comparison of some of them , that recently were used, like cephradine [26], diethylentriaminepentaacetic acid (DTPA) [25], choloranilic acid [18], potassium hydrogen phthalate [27], N,N-ethylene bis (salicylidenimine) [28] and aluminon [20] was carried out and the result are summarized in Table 1. The main propose of this work is to describe a sensitive and free of interference AdSV procedure for trace measurement of uranium using pyromellitic acid as complexing agent.…”

Stripping Voltammetric Determination of Uranium in Water Samples Using Hg-Thin Film Modified Multiwall Carbon Nanotube Incorporated Carbon Paste Electrode

“…Chloranilic acid (CAA) has been used as the complexing agent by some workers and shown to have better activity in terms of the formation of surface-active complexes with uranium [6][7][8][9][10][11]. Many complexing agents, other than chloranilic acid has been used which includes, oxin [12], cupferron [13] propyl gallate [14], catechol [15], potassium hydrogen phthalate [16], aluminon [17], 8-hydroxy-quinoline [18], pyromellitic acid [19], arsenazo (III) [20] and humic acid [21]. In the entire above cases mercury drop as the working electrode was used.…”

Differential Pulse Polarographic Determination of Uranium(VI) in Complex Materials after Adsorption of Its Trifluoroethylxanthate Cetyltrimethylammonium Ion-Associated Complex on Naphthalene Adsorbent

“…Uranium may also be determined by adsorptive stripping voltammetry [22][23][24][25][26][27] and squarewave stripping voltammetry. 28,29 These methods may be fairly sensitive, but not sufficiently selective and reproducible.…”

“…The reproducibility depends upon a number of parameters, like the rigid control of the temperature, pH, reagent concentration, surface area of the working electrode, stirring time, and the rate of formation of film on the electrode. [20][21][22][23][24][25][26][27][28][29] Several studies on the direct polarographic determination of uranium after extraction of its metal complexes into organic solvents have been reported. [30][31][32][33] Unfortunately, electrochemical methods for the direct determination of reducible substances require that the solvent have a fairly high dielectric constant so that a well-defined polarogram can be obtained.…”