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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4499

Title: Analytical evaluation of a tungsten coil atomizer for cadmium, lead, chromium, manganese, nickel and cobalt determination by electrothermal atomic absorption spectrometry
Authors: Bruhn, C.G.
Ambiado, F.E.
Cid, H.J.
Woerner, R.
Tapia, J.
Garcia, R.
Keywords: Atomic absorption spectrometry; Unenclosed tungsten coil atomizer; Metals; Waters
Issue Date: 1995
Publisher: Elsevier Science B.V.
Citation: Analytica Chimica Acta 306 (2-3): 183-192
Abstract: The analytical performance of an unenclosed tungsten coil atomizer operating in Ar-H2 (90:10) was assessed by electrothermal atomic absorption spectrometry (ETAAS) for the determination of pg to ng levels of Cd, Co, Cr, Mn, Ni and Pb in liquid samples. A three-steps low power unit provided the heating programme for the tungsten coil with dry, pyrolysis and vaporization-atomization as sequential steps, and shortlived absorption signals (100–250 ms) were produced with an analysis time of 100 s. Parameters studied were the current applied to the coil; temperatures and duration of the three heating steps; purge gas flow rate; coil alignment in the radiation beam; and sample volume. Under optimized conditions, linear working ranges extended between 0–2.0 μg l−1 for Cd and 0–100 μg l−1 for Ni and Pb, and characteristic masses were between 0.3 pg (Cd) and 14 pg (Pb). Within-day reproducibility (relative standard deviation) of measurements varied between 2.2% (Cr) and 7.5% (Pb), and between-day was < 8% (Pb) in the analyte's linear working ranges
Description: Tapia, J. Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747 Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/4499
ISSN: 0003-2670
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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