Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 71-72, Issue -, Pages 80-85Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2012.03.008
Keywords
Direct solid sampling; ET AAS; Brown coal fly ash; Chemical modifiers; Analytical lines
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Funding
- Grant Agency of Comenius University [UK/135/2011]
- Slovak Research and Development Agency [VVCE-0070-07]
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This work describes a method for the direct determination of Bi, Cd, Cr, Ni, Pb, Sb, Sn and Zn in reference materials of brown coal fly ash, using solid sampling electrothermal atomic absorption spectrometry. The use of chemical modifiers was found to be necessary for obtaining reproducible and sufficiently sensitive signals for the analytes under study. The mixture of Pd and Mg(NO3)(2) was used for the determination of Bi, Cd, Pb, Sb, Sn and Zn, W (permanent modifier) in combination with Mg(NO3)(2) (as aqueous modifier) provided well-defined signal profiles for Cr and Ni determination in coal fly ash samples. A systematic study focused on the use of alternative (less sensitive) lines for obtaining sufficient sensitivity. The following analytical lines were used: Bi 306.8 nm, Cd 326.1 nm, Cr 520.6 nm, Ni 305.1 nm, Pb 2053 nm, Sb 206.8 nm, Sn 300.9 nm, Zn 307.6 nm. The limits of detection were 0.057 mu g g(-1) for Bi, 0.21 mu g g(-1) for Cd, 1.1 mu g g(-1) for Cr, 1.4 mu g g(-1) for Ni, 4.0 mu g g(-1) for Pb, 0.13 mu g g(-1) for Sb, 0.33 mu g g(-1) for Sn and 16 mu g g(-1) for Zn, respectively. (C) 2012 Elsevier B.V. All rights reserved.
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