摘要
探讨了硅胶-氰丙基(SiO2/C3-CN,(1 g/0.5 g,6 mL))复合固相萃取柱分离与净化原油中饱和烃和芳烃组分的方法。结果表明:SiO2/C3-CN复合固相萃取柱较单一硅胶(SiO2)小柱的分离效果好,仅使用4.5 mL正己烷和4.5 mL正己烷-二氯甲烷(1∶1)洗脱即可实现饱和烃和芳烃组分的完全分离与满意回收(回收率分别为98%和99%);而单一硅胶小柱存在低环数芳烃化合物(如萘及其甲基系列、苊等)与饱和烃组分的共洗脱现象。通过对原油实物样品的测定,饱和烃和芳烃组分在硅胶-氰丙基复合柱上经正己烷、正己烷-二氯甲烷(体积比1∶1)的洗脱行为与标准混合液完全一致,该方法实用可靠、流程简单、试剂消耗少、精密度良好(RSD为4.2%～8.5%),适用于石油样品中饱和烃和芳烃组分的定量分析。
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 ∶ 1） 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 ∶ 1） 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.
出处
《分析测试学报》
CAS
CSCD
北大核心
2013年第7期796-802,共7页
Journal of Instrumental Analysis
基金
中国地质调查局地质调查项目(1212011120271)
关键词
固相萃取
硅胶-氰丙基复合柱
饱和烃
芳烃
solid phase extraction（SPE）
silica-cyanoproply combined cartridges
saturated hydrocarbons
aromatic hydrocarbons
