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|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.|
|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.|
|Appears in Collections:||Artículos en publicaciones ISI - Universidad de Talca|
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