Square-Wave Stripping Voltammetry of Uranium(VI) at the Glassy Carbon Electrode. Application to Some Industrial Samples

Abstract

A new method for trace uranium, based on the adsorptive accumulation of the chelate compound formed between U(Vl) and [4-(2-hydroxyethyl)-l-piprazine ethane sulfonic acid] on glassy carbon electrode is described. The optimum conditions for the complex formation were: 0.02 M HClO 4 , pH 4.0, accumulation potential 0.1 V (vs. AgyAgCl), frequency 15 Hz and SW amplitude 25 mV. Under these conditions, it was easy to determine the metal ion in a concentration range as low as 1610 À9 M. The effect of possible interfering metal ions, e.g., Cu(II), Fe(III), Al(III), Mg(II), etc. has been tested. Application of the method for the determination of the metal ion in some industrial samples has been successfully done.

Modified carbon-containing electrodes in stripping voltammetry of metals

“…To make the GCE surface reproducible, it is prepared and cleaned by a great variety of methods such as mechanical polishing [108], treatment with reagents [76], electrochemical treatment by polarization at high anode potentials [36,186], and exposure to microwaves or ultrasound [29,40,131]. Mechanical polishing of the surface with abrasive diamond or Al 2 O 3 powders or special polish cloths is in most common use.…”

“…Organic substances (OS) [107][108][109][110][111][112][113][114][115][116][117][118][119][120][121], macrocyclic compounds [122][123][124][125][126], polymers [127-131, 157-159, 165-166, 169-175], bioactive compounds [186], and nanotubes [187][188][189][190] can also serve as GCE modifiers. Different combinations of the modifiers-a metal and OS [70-80, 97-105, 106], a polymer and a metal [86, 132-147, 160- [107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123][124][125][126] or the first modifying layer of mer...…”