Simultaneous determination of trace uranium(VI) and zinc(II) by adsorptive cathodic stripping voltammetry with aluminon ligand
Simultaneous determination of trace uranium(VI) and zinc(II) by adsorptive cathodic stripping voltammetry with aluminon ligand
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DOI：
10.1016/s0039-9140(00)00472-0
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发表时间：
2000-09-05
期刊：
影响因子：
6.1
通讯作者：
Park, SH
中科院分区：
文献类型：
--
作者：
Cha, KW;Park, CI;Park, SH
使用悬挂汞滴电极通过吸附阴极溶出伏安法 (ACSV) 测定与铝（3-[双（3-羧基-4-羟基苯基）亚甲基]-6-氧代-1,4-环己二烯-1-羧酸三铵盐）络合的铀（VI）。在铝和尿素存在的情况下，可以在单次扫描中同时测定痕量铀 (VI) 和锌 (II)。发现最佳条件是：积累时间； 180-200 s，积累潜力； 50 mV 相对于 Ag/AgCl，扫描速率； 40 mV s(-1)，支持电解质； 0.1 M 乙酸钠缓冲液，pH 6.5-7.0，铝浓度； 1 x 10(-6) M。铀(VI)和锌(II)的线性范围分别在2-33和30-120 ng ml(-1)浓度范围内观察到。检测限（S/N = 3）为0.2 ng ml(-1)（铀）和30 ng ml(-1)（锌）。良好的重现性显示 RSD 为 2.5-4.0% (n = 10)。该过程提供了高选择性，尿素的存在掩盖了一些金属离子。 (C) 2000 Elsevier Science B.V. 保留所有权利。
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.