Analysis of tert-butyldimethylsilyl derivatives in heavy gas oil from brazilian naphthenic acids by gas chromatography coupled to mass spectrometry with electron impact ionization

Campos, Maria Cecı́lia Vaz de; Oliveira, Eniz Conceição; Filho, Pedro José Sanches; Piatnicki, Clarisse Maria Sartori; Caramão, Elina Bastos

doi:10.1016/j.chroma.2005.07.040

Cited by 29 publications

(14 citation statements)

References 31 publications

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“…There are several reports in the literature of applications of EI to characterize NAs in environmental samples (Green et al, 1985;Dzidic et al, 1988;St. John et al, 1998;Hao et al, 2005;de Campos et al, 2006;Merlin, Guigard, & Fedorak, 2007). The applications tend to be based on sample introduction by gas chromatography and using esters of the carboxylic acids.…”

Section: B Electron Ionizationmentioning

confidence: 99%

Mass spectrometric characterization of naphthenic acids in environmental samples: A review

Headley

Peru

Barrow

2008

Mass Spectrometry Reviews

151

124

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There is a growing need to develop mass spectrometric methods for the characterization of oil sands naphthenic acids (structural formulae described by C(n)H(2n+z)O(2) where n is the number of carbon atoms and "z" is referred to as the "hydrogen deficiency" and is equal to zero, or is a negative, even integer) present in environmental samples. This interest stems from the need to better understand their contribution to the total acid number of oil sands acids; along with assessing their toxicity in aquatic environments. Negative-ion electrospray ionization has emerged as the analytical technique of choice. For infusion samples, matrix effects are particularly evident for quantification in the presence of salts and co-elutants. However, such effects can be minimized for methods that employ chromatographic separation prior to mass spectrometry (MS) detection. There have been several advances for accurate identification of classes of naphthenic acid components that employ a range of MS hyphenated techniques. General trends measured for degradation of the NAs in the environment appear to be similar to those obtained with either low- or high-resolution MS. Future MS research will likely focus on (i) development of more reliable quantitative methods that use chromatography and internal standards, (ii) the utility of representative model naphthenic acids as surrogates for the complex NA mixtures, and (iii) development of congener-specific analysis of the principal toxic components.

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Section: B Electron Ionizationmentioning

confidence: 99%

Mass spectrometric characterization of naphthenic acids in environmental samples: A review

Headley

Peru

Barrow

2008

Mass Spectrometry Reviews

151

124

View full text Add to dashboard Cite

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“…This technique has been used for petroleum samples, e.g. for separation of aliphatic and aromatic hydrocarbons [117], and also for analysis of naphthenic acids [99,100]. In this work a SPE technique for rapid, preparative subfractionation of crude oil acid extracts is developed (Paper I).…”

Section: Solid Phase Extractionmentioning

confidence: 99%

Changes in Crude Oil Composition during Laboratory Biodegradation: Acids and Oil–Water, Oil–Hydrate Interfacial Properties

Erstad¹,

Hvidsten²,

Askvik³

et al. 2009

Energy Fuels

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I would like to express my profound gratitude to my supervisors Tanja Barth, Sylvi Høiland and Per Fotland for your guidance, helpfulness, inspiration and encouragement throughout my PhD project. Your support, as well as your care for my well-being, have been invaluable to me. The Research Council of Norway and StatoilHydro ASA are thanked for funding the project. It has been very educational and interesting for me to be part of the HYPERION project, and I want to thank all the participants for the collaboration. I also want to express my thankfulness to Stefanie Pötz, Heinz Wilkes and Brian Horsfield for kindly welcoming me to a stay at GFZ. I wish to thank all my fellow students, colleagues and friends. A special thank goes to Espen N. Vaular and Monica Jordheim who have been my companions throughout all my years of studies, and to Anna E. Borgund who I have been working closely together with, and who has been an invaluable discussion partner and friend. You have all been making my years at University of Bergen such a memorable and unforgettable time. Many people at the Department of Chemistry have lent a helping hand to my project one way or another, something I am truly grateful for. I especially want to thank Terje Lygre for assistance with instruments. Siv Elin and Torunn; I could not ask for any better and more faithful friends than you. My family has been essential to me during these years. I especially want to thank my parents for all support and care. My dear Steve has been an endless source of encouragement; thank you for being my rock in tough times, for constantly having faith in me and for your love. Finally to my two children Kjetil and Christian; you are always there for me, and I am so proud of you. You both mean the world to me.

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“…Moreover, some species are detected at trace levels [88], requiring a preconcentration step prior to instrumental analysis. Numerous studies employed liquid-liquid (LLE) and solid-phase extraction (SPE) to extract NAs [88,89,102], but LLE was the most popular method. Sample preparation methods are vital for analyzing NAs by direct MS, enabling selective characterization and reducing ionic suppression effects [64,103].…”

Section: Nas Techniques and Characterizationmentioning

confidence: 99%

Naphthenic Acids: Formation, Role in Emulsion Stability, and Recent Advances in Mass Spectrometry-Based Analytical Methods

Facanali

Porto

Crucello

et al. 2021

Journal of Analytical Methods in Chemistry

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Naphthenic acids (NAs) are compounds naturally present in most petroleum sources comprised of complex mixtures with a highly variable composition depending on their origin. Their occurrence in crude oil can cause severe corrosion problems and catalysts deactivation, decreasing oil quality and consequently impacting its productivity and economic value. NAs structures also allow them to behave as surfactants, causing the formation and stabilization of emulsions. In face of the ongoing challenge of treatment of water-in-oil (W/O) or oil-in-water (O/W) emulsions in the oil and gas industry, it is important to understand how NAs act in emulsified systems and which acids are present in the interface. Considering that, this review describes the properties of NAs, their role in the formation and stability of oil emulsions, and the modern analytical methods used for the qualitative analysis of such acids.

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Analysis of tert-butyldimethylsilyl derivatives in heavy gas oil from brazilian naphthenic acids by gas chromatography coupled to mass spectrometry with electron impact ionization

Cited by 29 publications

References 31 publications

Mass spectrometric characterization of naphthenic acids in environmental samples: A review

Mass spectrometric characterization of naphthenic acids in environmental samples: A review

Changes in Crude Oil Composition during Laboratory Biodegradation: Acids and Oil–Water, Oil–Hydrate Interfacial Properties

Naphthenic Acids: Formation, Role in Emulsion Stability, and Recent Advances in Mass Spectrometry-Based Analytical Methods

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