Journal
FUEL
Volume 163, Issue -, Pages 175-179Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2015.09.050
Keywords
Pitch analysis; Metals; Microwave-induced combustion; Dry ashing; Inductively coupled plasma optical emission spectrometry; X-ray fluorescence
Categories
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacdo de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacdo de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
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Pitch is a complex matrix and hard to be digested. In this way, some sample preparation methods (wet digestion and combustion) were investigated for subsequent determination of Ba, Ca, Cd, Fe, Mg, Pb, Sr, V and Zn using plasma-based techniques as well as direct analysis by X-ray fluorescence (XRF). Among the investigated sample preparation methods, dry ashing and microwave-induced combustion (MIC) shown similar results for some analytes, but significant losses for Cd, Pb and Zn were observed when dry ashing was used. Thus, MIC was chosen once a diluted solution (3 mol L-1 HNO3) was suitable for analytes absorption, up to 400 mg of pitch could be digested and no analyte losses were observed. Accuracy of MIC was evaluated by analysis of a standard reference material of Green Petroleum Coke (NIST 2718). In addition, a comparison with results obtained by XRF and MIC was performed and no statistical difference was observed. Thus, the proposed MIC method can be considered as suitable for the digestion and further elements determination in pitch. (C) 2015 Elsevier Ltd. All rights reserved.
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