Application of HR-CS FAAS to reveal, evaluate and overcome certain spectral events in lead determination in petroleum products
Zofia Kowalewska , H. Laskowska , M. Gieroń
AbstractSince the commercial introduction in 1923 tetraalkylleads (TELs) have been widely applied as antiknock agents and have caused significant contamination of environment all over the world, including Greenland snow and high alpine sites. At present the addition of TEL to automotive gasoline is forbidden in many countries, however, it is still applied in production of aviation gasoline. Petrol of type 110LL (blue) and petrol of type 91/115 (green) can contain up to 560 and 850 mg L-1 of Pb, respectively. On the other hand, in some catalytic processes the admissible lead content in raw material is at the level of g L-1. The main aim of this work was investigation of spectral effects in lead determination using high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS). Among others, the absorption by OH molecule has been considered. The molecule, present in the air-acetylene flame, generates fine-structured bands corresponding to the electronic transition between the X2Π and the A2Σ+ states . Until now, the effect of OH absorption on the Pb determination has been reported only once and for aqueous solutions analysis . Two lines of Pb have been studied (217.000 nm and 283.306 nm), as well as various options of baseline fitting and background correction (iterative background correction, reference pixels application, least squares background correction). The samples of different hydrocarbon composition were analyzed. For higher Pb concentration level the obtained results can be related to the results of alternative methods (wavelength dispersive X-ray fluorescence and/or titration with iodine mono-chloride). The results of the investigation will be applied to establish conditions for accurate Pb determination using both HR-CS FAAS and conventional line source FAAS. The feasibility and usefulness of internal standard application in Pb determination using HR-CS FAAS will be evaluated.
|Publication size in sheets||0.3|
|Book||MIHUCZ Viktor G. (eds.): EUROPEAN SYMPOSIUM ON ATOMIC SPECTROMETRY ESAS 2016. BOOK OF ABSTRACTS, 2016, Hungarian Chemical Society, ISBN 978-963-9970-65-6, 209 p.|
|Keywords in Polish||-|
|Keywords in English||lead determination, high-resolution continuum source atomic absorption spectrometry, structured background, spectral interference, gasoline|
|Abstract in Polish||-|
|Score|| = 15.0, 09-01-2018, BookChapterMatConf|
= 15.0, 09-01-2018, BookChapterMatConf
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