Determination of Saturated and Aromatic Hydrocarbons in Petroleum with SiO2/C3-CN Composite Solid Phase Extraction Cartridges

KeyWord:solid phase extraction£¨SPE£©  silica-cyanoproply combined cartridges  saturated hydrocarbons  aromatic hydrocarbons

Abstract:

      Simultaneous separation and purification of saturated and aromatic hydrocarbons in crude oil by using solid-phase extraction£¨ SPE £© cartridges of silica-cyanopropyl£¨ SiO2/C3-CN£© is presented in this paper.The results indicate that£¬compared with the separation effect of silica cartridges£¬the silica-cyanopropyl catridge¡¯s effect is better£¬and saturated and aromatics hydrocarbons could be separated completely with 4.5 mL C6H14 and CH2Cl2/C6H14£¨1¡Ã1£© as elution.The recoveries of saturated and aromatics hydrocarbons are 98% and 99%£¬respectively.However, the co-eluting phenomenon exists between aromatic£¨such as naphthalene and its methyl homologues£¬acenaphthylene£¬etc.£© and saturated hydrocarbons through the silica cartridges.The determination results of crude oil sample indicate that the elution behaviors of the saturated and aromatic hydrocarbon fractions with C6H14£¬CH2Cl2-C6H14£¨1¡Ã1£© are completely consisitent with the standard mixtures through the silica cyanopropyl cartridges.With the advantages of practicality£¬reliablity£¬easy to operate£¬low reagent consumption and good precision£¨ with RSDs of 4.2%-8.5% £©£¬the method is suitable for the quantification of crude oil samples with complicated matrices.