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標題: Precise blood lead analysis using a combined internal standard and standard addition approach with disposable screen-printed electrodes
作者: Yang, C.C.
Kumar, A.S.
Zen, J.M.
關鍵字: blood lead analysis;screen-printed electrode;internal standard;thallium;glassy-carbon electrodes;voltammetric determination;transfer kinetics;trace lead;thallium;cancer
Project: Analytical Biochemistry
期刊/報告no:: Analytical Biochemistry, Volume 338, Issue 2, Page(s) 278-283.
We report here a highly accurate and efficient method for blood lead analysis (BLA) through the use of a disposable electrode. A new type of mercury-plated preanodized screen-printed carbon electrode, together with a thallium(III) internal standard, simplifies calibration and gives easily quantifiable signals for accurate BLA. A preanodization procedure improves the preconcentration ability of the working electrode through the effect of lead (Pb) cornplexing with an electrogenerated surface functional group, mainly > C=O. Under optimized conditions, the ratio of the anodic stripping peak Currents of Ph and TI (i.e.. i(Pb)/i(TI)) is linear against [Pb] in the window of 1-300 ppb with a correlation coefficient and detection limit (signal-to-noise ratio = 3) of 0.999 and 0.23 ppb, respectively. This approach was used to analyze blood samples (17 = 55) from workers at a local battery factory. The results are consistent with those obtained from graphite furnace atomic absorption spectroscopy and confirm the applicability of the proposed method. (c) 2004 Elsevier Inc. All rights reserved.
ISSN: 0003-2697
DOI: 10.1016/j.ab.2004.12.015
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