STRIPPING VOLTAMMETRY OF URANIUM BASED ON ADSORPTIVE ACCUMULATION OF ITS 4-(2-PYRIDYLAZO) RESORCINOL COMPLEX AT THE STATIC MERCURY DROP ELECTRODE

被引:20
作者
FARIAS, PAM
OHARA, AK
机构
[1] Department of Chemistry, Pontificia Universiáade Católica do Rio de Janeiro, Rio de Janeiro
关键词
URANIUM; ADSORPTIVE STRIPPING VOLTAMMETRY; TRACE ANALYSIS;
D O I
10.1002/elan.1140030917
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A highly sensitive electrochemical stripping procedure for uranium is reported. Accumulation is achieved by controlled adsorption of the uranium/4-(2-pyridylazo) resorcinol complex on the static mercury drop electrode. The effect of various operational parameters on the stripping response is discussed. The detection limit is 0.2 nM with 10 min preconcentration. The response is linear over a 9.3 x 10(-9)-3.0 x 10(-6) M concentration range, and the relative standard deviation (at the 24-mu-g.l-1 level) is 3%. Most cations and anions do not interfere in the determination of uranium; some interferences are eliminated by the addition of CDTA and EDTA. The applicability of the method to fresh water and seawater is demonstrated (the results obtained for uranium in reference seawater samples, NASS-2, were 2.95-mu-g.l-1 with standard deviations of 0.20-mu-g.l-1 (n = 5).
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页码:985 / 992
页数:8
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