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

• Published in: Talanta (Oxford) Vol. 52; no. 6; pp. 983 - 989
• Main Authors: Cha, Ki-Won, Park, Chan-Il, Park, Sang-Hyun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 05.09.2000; Oxford Elsevier
• Subjects: Adsorptive cathodic stripping voltammetry; Aluminon; Analytical chemistry; Chemistry; Electrochemical methods; Exact sciences and technology; Sodium acetate buffer; Uranium; Adsorptive cathodic stripping voltammetry; Sodium acetate buffer; Aluminon; Uranium; Trace analysis; Sand; Dropping electrode; Zinc II; Metal complex; Selectivity; Cathodic stripping voltammetry; Urea; Reproducibility; Detection limit; Simultaneous measurement; Uranium VI
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/S0039-9140(00)00472-0

Uranium(VI) complexed with aluminon (3-[bis(3-carboxy-4-hydroxy-phenyl)methylene]-6-oxo-1,4-cyclohexadiene-1-carboxylic acid triammonium salt) was determined by adsorptive cathodic stripping voltammetry (ACSV) using a hanging mercury drop electrode. Trace uranium(VI) and zinc(II) can be simultaneously determined in a single scan in the presence of aluminon and urea. Optimal conditions were found to be: accumulation time; 180–200 s, accumulation potential; 50 mV versus Ag/AgCl, scan rate; 40 mV s −1, supporting electrolyte; 0.1 M sodium acetate buffer at pH 6.5–7.0, and concentration of aluminon; 1×10 −6 M. The linear range of uranium(VI) and zinc(II) were observed over the concentration range 2–33 and 30–120 ng ml −1, respectively. The detection limit ( S/ N=3) are 0.2 ng ml −1 (uranium) and 30 ng ml −1 (zinc). A good reproducibility shows RSDs of 2.5–4.0% ( n=10). The procedure offers high selectivity, with the presence of urea masking some metal ions.