Determination of C0-C3 Alkylphenols in Crude Oils and Waters

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• 作者：Barry Bennett ; Bernard F. J. Bowler ; and Stephen R. Larter
• 刊名：Analytical Chemistry
• 出版年：1996
• 出版时间：October 15, 1996
• 年：1996
• 卷：68
• 期：20
• 页码：3697 - 3702
• 全文大小：210K
• 年卷期：v.68,no.20(October 15, 1996)
• ISSN：1520-6882

文摘

Three rapid methods for the isolation and determinationof alkylphenols from crude oils are described. Two ofthemethods are based on a novel approach involving thepreconcentration of crude oil phenols using non-end-capped C18 solid-phase extraction and a normal-phasesolvent program. To our knowledge, this is the firstreportof a C18 sorbent being used in "normal-phase mode" toisolate relatively polar compounds from a more nonpolarmatrix. Determination of alkylphenols is performed byreversed-phase high-performance liquid chromatography(RP-HPLC), combined with oxidative electrochemicaldetection (ED), or by gas chromatography/flame ionization detection (GC/FID) and gas chromatography/massspectrometry (GC/MS) after chemical derivatization. Adirect alkaline extraction RP-HPLC/ED approach is alsodescribed. The reversed-phase HPLC method affordsrapid sample turnovers with accurate quantitation ofphenol, cresols, and major dimethylphenols and is suitable for screening large numbers of samples. Alternatively, the GC/FID-GC/MS method allows the determination of phenol, cresols, dimethylphenols, ethylphenols,and trimethylphenols at levels suitable for routine use inpetroleum geochemistry. We illustrate the methodswithtwo petroleum geochemical examples: determination ofthe partition coefficients of alkylphenols in oil/brinesystems under high pressure and temperature conditions,and study of alkylphenol distributions in a migration casehistory from the North Sea.