INQUISUR   21779
INSTITUTO DE QUIMICA DEL SUR
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Automatized flow-batch method for sonochemiluminescent determination of free glycerol in biodiesel samples using on-line extraction
Autor/es:
PAULO HENRIQUE GONÇALVES DIAS DINIZ; MARCELO PISTONESI; MARIO UGULINO DE ARAÚJO; FERNÁNDEZ BAND BEATRIZ
Lugar:
Thessaloniki
Reunión:
Congreso; XII International Conference on Flow Analysis; 2012
Institución organizadora:
Aristotle University
Resumen:
The determination of free glycerol in biodiesel is important, because it is one of the indicators of biodieselquality, since its presence can cloggy the fuel filters, damage the combustion system, contribute for tankcorrosion and fuel oxidation. Additionally, it can generate highly toxic gases during the fuel combustion,causing environmental pollution. *1+In the recent years, flow-based analytical approaches have been developed for determining free glycerolin biodesel, and employed laborious steps of liquid?liquid extraction and following sample preparation byusing expensive and toxic reagents. *1?4+In order to overcome these drawbacks, an automatic method, based on flow-batch (FB), for determiningglycerol in biodiesel was developed. The FB systems draw upon the useful features of flow, batch and multicommutationapproaches. The standards, sample extraction and detection were fully automated andachieved into a homemade chamber, which was coupled with a piezoelectric device and optical fibers todetection by a photomultiplier.The proposed method is based on liquid?liquid extraction of glycerol with water *4+, and followingsonication of standard and sample solutions in order to produce water cavitation. Thus,sonochemiluminescence quenching procedure was obtained *5+. The analytical signals were recorded byusing a photomultiplier. A linear response was observed from 1.0x10-2 to 1.0x10-6 mg L−1 glycerol, variationcoefficient 1.5% e sampling rate 20 h−1. The procedure was successfully applied to the analysis of biodieselsamples, and the results agreed with the reference method (ASTM D6584-07) at 95% confidence level.Moreover, the proposed approach presents the advantages of using no reagents, requires no prior handlingof the samples, and it generates little waste.References*1+ S.G. Silva, F.R.P. Rocha, Talanta 83 (2010) 559?564.*2+ S.G. Silva, A.M. Rubio, M. Guardia, F.R.P. Rocha, Anal. Bioanal. Chem. 401 (2011) 365?371.*3+ A.H. Maruta, T.R.L.C. Paixão, Fuel 91 (2012) 187?191.*4+ M.B. Lima, M. Insausti, C.E. Domini, M.F. Pistonesi, M.C.U. Araújo, B.S.F. Band, Talanta 89 (2012) 21? 26.*5+ D. Sunartio, F. Grieser, M. Ashokkumar, Ultrason. Sonochem. 16 (2009) 23?27.