Vermiculite clay mineral as an effective carbon paste electrode modifier for the preconcentration and voltammetric determination of Hg(II) and Ag(I) ions

被引:3
作者
Svegl, IG
Kolar, M
Ogorevc, B
Pihlar, B
机构
[1] Natl Inst Chem, Analyt Chem Lab, Ljubljana 1001, Slovenia
[2] Univ Ljubljana, Fac Chem & Chem Technol, Ljubljana, Slovenia
来源
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1998年 / 361卷 / 04期
关键词
D O I
暂无
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A vermiculite modified carbon paste electrode (VMCPE) was employed for the in situ preconcentration of traces of Hg(II) and Ag(I) via an ion-exchange route. Heavy metal ions were accumulated in Britton-Robinson (BR) buffer pH 7 for Hg(II) and pH 6 for Ag(I), and afterwards reduced at -0.7 V vs. Ag/AgCl in the separate measurement solution (BR buffer pH 5 + 0.05 mom NaNO3) prior to the anodic stripping square wave voltammetric (ASSWV) detection. For Hg(II) ions, at 15 min accumulation, a linear range from 1.0 x 10(-7) to 8.0 x 10(-6) mol/L was obtained, with a 5.7 x 10(-8) mol/L limit of detection. The VMCPE response was linear for Ag(I) ions in the concentration range from 2.0 x 10(-7) to 8.0 x 10(-6) mol/L, at 10 min accumulation with a corresponding limit of detection of 6.3 x 10(-8) mol/L. The relative standard deviation of the analytical procedure including accumulation from a 5 x 10(-7) mol/L solution of Hg (15 min) or Ag(I) (10 min), electrolysis, ASSWV detection, regeneration and activation of the VMCPE, was 4% (n = 6). The optimisation of the parameters for the application of the VMCPE in combination with ASSWV detection is presented and discussed.
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页码:358 / 362
页数:5
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