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ZHANG Zhu-yue, LIU Mei-mei, XIE Man-man, WANG Dao-cong, LING Yuan, SHANG Wen-yu, LIU Shu-bo, CEN Kuang, SUN Qing. Specific Carbon Isotopic Analysis of n-Alkanes in Soils by Gas Chromatography-Isotope Ratio Mass Spectrometry with 5A Molecular Sieve Adsorption and Mixed Solvent Elution[J]. Rock and Mineral Analysis, 2012, 31(1): 178-183.
Citation: ZHANG Zhu-yue, LIU Mei-mei, XIE Man-man, WANG Dao-cong, LING Yuan, SHANG Wen-yu, LIU Shu-bo, CEN Kuang, SUN Qing. Specific Carbon Isotopic Analysis of n-Alkanes in Soils by Gas Chromatography-Isotope Ratio Mass Spectrometry with 5A Molecular Sieve Adsorption and Mixed Solvent Elution[J]. Rock and Mineral Analysis, 2012, 31(1): 178-183.

Specific Carbon Isotopic Analysis of n-Alkanes in Soils by Gas Chromatography-Isotope Ratio Mass Spectrometry with 5A Molecular Sieve Adsorption and Mixed Solvent Elution

  • n-alkanes were concentrated after separating by a 5A molecular sieve and extracted by a mixture solvent of cyclohexane and n-pentane. In this study, the amount of 5A molecular sieve and the ratios of cyclohexane and n-pentane were optimized as 2.76 g and 991, respectively. It was discovered that short carbon chain n-alkanes were readily absorbed by a 5A molecular sieve, compared to the long carbon chain n-alkanes. The complexation efficiency is higher for long carbon chain n-alkanes than that of short carbon chain n-alkanes with enough 5A molecular material at higher temperature. In this study, n-alkanes contents were determined by Gas Chromatography (GC) and compound specific carbon isotope ratios of individual n-alkanes in soil were measured by Gas Chromatography-Isotope Ratio Mass Spectrometry (GC-IRMS).The recoveries of n-alkanes ranged from 44% to 72‰ with a precision of 4%-8%. The accuracies of compound specific carbon isotopes of n-alkanes ranged from 0.04‰ to 0.38‰ (1σ). The 5A molecular sieve procedure was used to analyse soil samples around a gas station. The results indicate that almost all of the unseparated and interference peaks were eliminated and the purification of n-alkanes met the requirements of stable carbon isotope analysis.
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