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Issue 2, 2005
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Investigation of the mechanism of the electrothermal atomization of platinum in a graphite furnace from aqueous solutions and serum samples

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Abstract

The mechanism of platinum atomization in electrothermal graphite atomizers was investigated in aqueous solutions and in serum samples. The methods of Rojas-Olivares and Yan et al., representing a chemical approach to the investigation of atomization mechanisms, as well as the physical approach developed by L’vov, were used. The activation energies for 1–8 ng of Pt in aqueous solution, calculated with use of the first two methods, increased with the increase of Pt mass, ranging from Ea = 245 ± 13 kJ mol−1 to Ea = 387 ± 11 kJ mol−1. The change of ratio Tapp/E from 6 to 4 with increasing Pt masses suggests that the atomization mechanism of Pt is progressively changing from an adsorption to an evaporation process. In serum samples, for all the Pt masses examined, one mechanism is observed. The calculated activation energy had a mean value of Ea = 203 ± 8 kJ mol−1 and is ascribed to an atomization mechanism via thermal desorption of Pt atoms from the carbon residue produced by the pyrolysis of the organic matrix. Confirmation of the above conclusions is provided by the physical method of L’vov, as the ratio Tapp/E was approximately 8 in the presence of serum matrix. All the methods used gave consistent conclusions rendering them more reliable.

Graphical abstract: Investigation of the mechanism of the electrothermal atomization of platinum in a graphite furnace from aqueous solutions and serum samples

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Publication details

The article was received on 14 Jul 2004, accepted on 21 Dec 2004 and first published on 12 Jan 2005


Article type: Paper
DOI: 10.1039/B410776D
Citation: J. Anal. At. Spectrom., 2005,20, 111-117
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    Investigation of the mechanism of the electrothermal atomization of platinum in a graphite furnace from aqueous solutions and serum samples

    P. S. Eleni, N. S. Thomaidis and E. A. Piperaki, J. Anal. At. Spectrom., 2005, 20, 111
    DOI: 10.1039/B410776D

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