Trace Level Determination of Lead(II) in Water by Colorimetric-Solid Phase Extraction 2005-01-2889
Preliminary results on the development of quick, simple analytical method for the low level of lead(II) in water samples are described. The method concentrates lead(II) on a small solid-phase extraction disk, which is then quantified directly on the disk by diffuse reflectance spectroscopy (DRS). This method, termed colorimetric solid-phase extraction (C-SPE), requires only 1–2 min for complete workup and is suitable for use in a wide range of applications, including the microgravity environment on the International Space Station. The procedure first adds an excess of potassium iodide to a 10.0 mL sample at a pH of 3.0–3.5 to produce the anionic PbI42− colored complex, which is exhaustively extracted by the disk that was previously impregnated with cetylpyridinium chloride (CPC). The amount of complex extracted is then determined at 420 nm by a hand-held DRS instrument. A linear calibration plot was obtained for lead(II) concentrations from 0.02–2.50 ppm, with a detection limit of 0.010 ppm. Results from interference tests using Ni(II), Cd(II), Zn(II), Cu(II), and Hg(II) yielded deviations of ±10%.
Citation: Dias, N., Fritz, J., and Porter, M., "Trace Level Determination of Lead(II) in Water by Colorimetric-Solid Phase Extraction," SAE Technical Paper 2005-01-2889, 2005, https://doi.org/10.4271/2005-01-2889. Download Citation
Author(s):
Neil C. Dias, James S. Fritz, Marc D. Porter
Affiliated:
Institute for Combinatorial Discovery, Ames Laboratory - U.S. Department of Energy and Department of Chemistry, Iowa State University
Pages: 6
Event:
International Conference On Environmental Systems
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Spacecraft
Water
Microgravity
Spectroscopy
Potassium
Calibration
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