阴极吸附溶出伏安法测定与2,6-吡啶二甲酸络合的铀（VI）

Cathodic adsorptive stripping voltammetric determination of uranium (VI) complexed with 2, 6-pyridinedicarboxylic acid.

作者信息

Gholivand M B, Nassab H Rashidi, Fazeli H

机构信息

Department of Chemistry, Faculty of Science, Razi University, Kermanshah, Iran.

出版信息

Talanta. 2005 Jan 15;65(1):62-6. doi: 10.1016/j.talanta.2004.05.019.

DOI:10.1016/j.talanta.2004.05.019

PMID:18969764

Abstract

Uranium (VI) (U(VI)) forms a complex with dipicolinic acid (2, 6-pyridinedicarboxylic acid).This complex can be used for a highly sensitive and selective determination of uranium by adsorptive cathodic stripping voltammetry (ACSV) using a hanging mercury drop electrode (HMDE) as working electrode. Influence of effective parameters such as pH, concentration of ligand, accumulation potential and accumulation time on the sensitivity and selectivity were studied. The detection limit (3sigma of the blank value) obtained under the optimal experimental conditions is 0.27 x 10(-9)M after 150s of the accumulation time. The peak current is proportional to the concentration of U(VI) in the range of 1 x 10(-9) to 1.2 x 10(-7)M. The relative standard deviation of 2.5% at the 3.5 x 10(-8)M level was obtained. The interference of some metal ions and anions were studied. The application of this method was tested in the determination of uranium in synthetic and natural water samples.

摘要

铀（VI）（U(VI)）与二吡啶甲酸（2,6 - 吡啶二甲酸）形成一种络合物。该络合物可用于采用悬汞滴电极（HMDE）作为工作电极的吸附阴极溶出伏安法（ACSV）对铀进行高灵敏度和高选择性测定。研究了诸如pH值、配体浓度、富集电位和富集时间等有效参数对灵敏度和选择性的影响。在最佳实验条件下，富集150秒后获得的检测限（空白值的3倍标准偏差）为0.27×10⁻⁹M。峰电流在1×10⁻⁹至1.2×10⁻⁷M范围内与U(VI)的浓度成正比。在3.5×10⁻⁸M水平下获得的相对标准偏差为2.5%。研究了一些金属离子和阴离子的干扰情况。该方法在合成水样和天然水样中铀的测定方面进行了应用测试。