Molecular and isotopic analysis of oils by solid phase microextraction of gasoline range hydrocarbons

被引:31
作者
Harris, SA [1 ]
Whiticar, MJ [1 ]
Eek, MK [1 ]
机构
[1] Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC V8W 2Y2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
gasoline range hydrocarbons; SPME; headspace sampling; purge and trap; stable carbon isotopes; oil correlation; hydrocarbon fingerprinting; CF-IRMS;
D O I
10.1016/S0146-6380(99)00056-X
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
An improved method for molecular and stable isotope analysis of gasoline range hydrocarbons (C(5)-C(10)) in oils uses Solid Phase Microextraction. Analytes are sampled from the headspace above oil droplets and analyzed by gas chromatography and continuous-flow isotope-ratio mass spectrometry. Analytical considerations with this sampling technique include equilibration times, vapor pressure/temperature effects, and the presence of a complex matrix. Instrumentation factors such as column/split flows are also considered. The results are compared with an alternative purge and trap method. Molecular analyses prove reproducible between the two methods, however, stable carbon isotope ratios exhibit a non-systematic depletion and enrichment of 0.2-2.0 parts per thousand for 16 pre-selected compounds. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:721 / 737
页数:17
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