Voltammetric determination of thallium(I) at a mechanically renewed Bi-graphite electrode
Voltammetric determination of thallium(I) at a mechanically renewed Bi-graphite electrode
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DOI：
10.1134/s1061934807020104
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发表时间：
2007-02-01
影响因子：
1.1
通讯作者：
Tarasova, V. A.
中科院分区：
文献类型：
--
作者：
Tarasova, V. A.
采用高纯度级碳粉和环氧树脂的复合材料原位制备铋膜电极。指示电极的表面在每次测定前通过切割薄表面层来更新。原位获得的双膜电极在灵敏度、再现性和分离Tl、Cd和Pb信号的能力方面与hg膜电极几乎没有什么不同。铊浓度在0.01 ~ 1mg /L范围内呈线性关系（RSD为4% ~ 2%）。大量过量的Pb（II）、Sn（II）和Cd（II）不会干扰铊的测定。建立了测定碳酸锂中低至5 × 10(-6)%铊的方法。
A composite of high-purity grade carbon powder and an epoxy resin is used to in situ obtain a bismuth-film electrode. The surface of the indicator electrode is renewed by cutting a thin surface layer before each determination. The in situ obtained Bi-film electrode is virtually no different from an Hg-film electrode in sensitivity, reproducibility, and the ability to separate signals from Tl, Cd, and Pb. The calibration graph is linear in the range of thallium concentrations from 0.01 to 1 mg/L (RSD varies from 4 to 2%). A significant excess of Pb(II), Sn(II), and Cd(II) does not interfere with the determination of thallium. A procedure for determining down to 5 x 10(-6)% thallium in lithium carbonate is developed.