Conventional and fast gas chromatography analysis of biodiesel blends using an ionic liquid stationary phase.
The present research is focused on the GC-FID determination of fatty acid methyl esters (FAMEs) in diesel blends, by means of an ionic liquid stationary phase, characterized by a dicationic 1,9-di(3-vinyl-imidazolium)nonane bis(trifluoromethyl)sulfonylimidate structure (SLB-IL100). The high polarity of the ionic liquid stationary phase allowed the separation of the FAMEs, from the less-retained hydrocarbons, thus avoiding the requirement of a hydrocarbon LC pre-separation. The results derived from the analyses of a soybean FAMEs B20 sample, carried out on an SLB-IL100 conventional column (30 m x 0.25 mm i.d. x 0.20 mm d(f)), were compared with those attained on a polyethylene glycol column, of equivalent dimensions. Conventional and fast GC methods, for the analysis of FAMEs in diesel blends, were developed on an SLB-IL100 30 m x 0.25 mm i.d. x 0.20 microm d(f) and on an SLB-IL100 12 m x 0.10 mm i.d. x 0.08 microm d(f) column, respectively. The optimized IL methods were subjected to validation: retention time and peak area intra-day precision (n=5) were good, with CV % values lower than 0.08% and 4.9%, respectively. With regards to the quantitation of FAMEs in biodiesel blends, a five points calibration curve was constructed, using C(17:0) as internal standard.
Ragonese
Carla
C
Dipartimento Farmaco-chimico, Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy.
Tranchida
Peter Quinto
PQ
Sciarrone
Danilo
D
Mondello
Luigi
L
D056804:Biofuels / Q000032:analysis*; D002138:Calibration; D002244:Carbon / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods*; D004952:Esters / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D052578:Ionic Liquids / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013024:Soybean Oil / Q000737:chemistry; D013696:Temperature
D056804:Biofuels; D004952:Esters; D005227:Fatty Acids; D052578:Ionic Liquids; D012997:Solvents; D002244:Carbon; D013024:Soybean Oil