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

被引:44
作者
Cha, KW [1 ]
Park, CI [1 ]
Park, SH [1 ]
机构
[1] Inha Univ, Dept Chem, Inchon 402751, South Korea
关键词
adsorptive cathodic stripping voltammetry; uranium; aluminon; sodium acetate buffer;
D O I
10.1016/S0039-9140(00)00472-0
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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 x 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. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:983 / 989
页数:7
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