期刊
ANALYTICA CHIMICA ACTA
卷 707, 期 1, 页码 1-6出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2011.09.026
关键词
Ion-selective electrode; Solid-state membrane; Low detection limit; Direct measurement of lead (II)
资金
- Graduate School of Chemical Sensors and Microanalytical Systems (CHEMSEM)
- Polish Ministry of Science and Higher Education [N507 234340]
Lowering of the detection limit of solid-state lead-selective electrodes was achieved by using the tuned galvanostatic polarization method. A Nernstian response was obtained down to nanomolar concentrations (low detection limit 10(-9) mol dm(-3) Pb2+). Good repeatability of the calibration curves was achieved by using a well established measuring procedure. Relatively high cathodic current densities were applied to the solid-state membrane in order to shorten the measurement time. Successful determination of lead in a synthetic sample (pPb(2+) = 7.97 +/- 0.08) was achieved by introducing an analytical protocol and favourably compared to inductively coupled plasma mass spectrometry (pPb = 7.93). By applying this method, a significant improvement in the detection limit of solid-state lead-selective electrodes was attained. (C) 2011 Elsevier BM. All rights reserved.
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