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Mercury determination in petroleum products by electrothermal atomic absorption spectrometry after in situ preconcentration using multiple injections

dos Santos, Walter N. L. ; Dias, F?bio de S. ; Reboucas, Marcio V. ; Pereira, Madson de G. ; Lemos, Valfredo A. ; Teixeira, Leonardo S. G.

Journal of analytical atomic spectrometry, 2006-01, Vol.21 (11), p.1327-1330 [Periódico revisado por pares]

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  • Título:
    Mercury determination in petroleum products by electrothermal atomic absorption spectrometry after in situ preconcentration using multiple injections
  • Autor: dos Santos, Walter N. L. ; Dias, F?bio de S. ; Reboucas, Marcio V. ; Pereira, Madson de G. ; Lemos, Valfredo A. ; Teixeira, Leonardo S. G.
  • Assuntos: Atomic absorption analysis ; Brazil ; Graphite ; Mathematical analysis ; Mercury ; Naphtha ; Standard deviation ; Tubes
  • É parte de: Journal of analytical atomic spectrometry, 2006-01, Vol.21 (11), p.1327-1330
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: A simple method for mercury determination in petroleum fractions ( naphtha) using electrothermal atomic absorption spectrometry (ETAAS) associated with multiple injection technique for direct preconcentration in the graphite tube has been developed. Oil-in-water micro-emulsions (three-component solutions) were prepared using a mixture of sample, propan-1-ol and HNO. No additional sample pretreatment was required. In the procedure, three successive 30 [small mu]L micro-emulsion aliquots are delivered to the graphite tube. The pyrolysis and atomization temperatures were set to 400 [degree]C and 1400 [degree]C, respectively. The calibration curves showed a linear response up to analyte concentrations of 150 [small mu]g L with a correlation coefficient of 0.993. The precision calculated from fifteen consecutive measurements and defined as the coefficient of variation of solutions containing 5.0 and 30 [small mu]g L of Hg were 6.4% and 4.7%, respectively. The limit of detection (LOD), defined as the Hg concentration that gives a response equivalent to three times the standard deviation () of the blank ( = 10), was found to be 0.78 [small mu]g L. The proposed procedure was used for mercury determination in naphtha feeds processed in Braskem S.A. (Salvador, Bahia, Brazil).
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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