期刊
TALANTA
卷 67, 期 1, 页码 28-33出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2005.02.009
关键词
adsorptive voltammetry; modified carbon paste electrode; silver; alizarin violet
A sensitive and selective procedure for the determination of trace silver(l) at alizarin violet modified carbon paste electrode has been developed. Silver(l) was accumulated on the electrode surface via complex formation with modifier in 0.1 mol/L acetate buffer (pH 5.2). After electrochemical reduction of silver(I) had been carried out, the reoxidation wave of silver(0) appeared at 0.05 V (versus SCE) on scanning the potential in the positive direction in 0.1 mol/L H2SO4 + 2.0 x 10(-4) mol/L KBr. For a preconcentration time of 3 min, the detection limit is 1.0 x 10(-10) mol/L and the linear range is from 3.0 x 10(-10) to 1.2 x 10(-7) mol/L. Many coexisting metal ions have little or no effect on the determination of silver(l). The proposed method was applied to the determination of silver in waste water and zinc alloy samples with satisfactory results. (C) 2005 Elsevier B.V. All rights, reserved.
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