期刊
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
卷 94, 期 7, 页码 1963-1969出版社
CHEMICAL SOC JAPAN
DOI: 10.1246/bcsj.20210118
关键词
Pitch analysis; Trace elements determination; Graphite furnace atomic absorption spectrometry
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [308857/2013-5]
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS) [16/2551-0000182-0]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) [001]
- INCTBio (CNPq) [573672/2008-3]
A new method for the determination of Co, Cr, Cu, Mn and Ni in pitch using DS-GF AAS technology was proposed, showing multiple advantages. The sample handling process of pitch was simplified and no chemical modifier was required for the analysis.
Considering the widespread use of pitch as a carbon source for manufacturing of carbon related materials, a method for the determination of Co, Cr, Cu, Mn and Ni in pitch by direct sampling graphite furnace atomic absorption spectrometry (DS-GF AAS) was proposed. The pyrolysis and atomization curves for reference solution and solid sample were evaluated. The influence of sample mass, the use of chemical modifier and the linear calibration range for each analyte were also evaluated. As advantages, the calibration with aqueous reference solutions was feasible for all the analytes and it was possible to use a relatively large sample mass, up to 3mg directly introduced into the graphite tube. The results obtained by DS-GF AAS were compared with those from analytes determination by inductively coupled plasma mass spectrometry after pitch digestion by microwave-induced combustion and no statistical differences (Student's t-test) were observed. The proposed method showed some advantages such as the minimum sample handling (only milling), the use of aqueous reference solutions for calibration and contrary to most work using GF AAS, Pd has been evaluated with no chemical modifier required, making the proposed method a suitable alternative for the quality control of pitch.
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