Variation and distribution of naphthenic acids in Dalian Bay sediment

Zan, Shuaijun; Wang, Jing; Wang, Fengbo; Han, Ying; Du, Miaomiao; Fan, Jing-Li

doi:10.1016/j.marpolbul.2019.01.061

Cited by 14 publications

(12 citation statements)

References 25 publications

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“…Authors also found NAs with carbon numbers ranging from 5 to 26 and Z values of 0 to −10 in marine sediments, with acyclic (Z � 0) and monocyclic carboxylic acids (Z � −2) with 12 to 19 carbons being the predominant NAs classes, corresponding to >70% of the total. Dicyclic-(Z � −4), tricyclic-(Z � −6), and tetracyclic (Z � −8) carboxylic acids were also reported by GC-MS analysis [115]. A different study found more than 100 NAs from OSPW, verifying extensive peak overlap with hydrocarbons [118], an unresolved complex mixture (UCM) also reported elsewhere [102,117,119].…”

Section: Nas Techniques and Characterizationmentioning

confidence: 80%

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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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Section: Nas Techniques and Characterizationmentioning

confidence: 80%

“…GC-MS methods have been used to characterize NAs due to the hyphenated technique improved peak capacity [67,75,102,[113][114][115][116][117]. In a single run, a study managed to identify 156 NAs by GC-MS [67].…”

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

View full text Add to dashboard Cite

show abstract

“…10,12−14 Besides, in the environmental studies of petroleum pollution, CAs are a toxic pollutant to water and soil. 15,16 In comparison to hydrocarbon, because of the relatively high polarity, CAs can migrate more easily in water or soil and some CAs possess higher biotoxicity. 7,17 However, in the field of petroleum organic geochemistry, CAs are valuable molecular markers to study the origin, 18,19 evolution, 20,21 migration, 2,22,23 and biodegradation 24−26 of oil.…”

Section: Introductionmentioning

confidence: 99%

“…), and aromatic acids ( Z ≤ −6). − Figure displays the representative structures of CAs. The content of CAs in crude oil ranges from an undetectable level to 4%. − In general, CAs have a negative effect on oil quality. , They cause poisoning of the catalyst in oil refining and corrosion of oil processing equipment and the pipeline. ,− Besides, in the environmental studies of petroleum pollution, CAs are a toxic pollutant to water and soil. , In comparison to hydrocarbon, because of the relatively high polarity, CAs can migrate more easily in water or soil and some CAs possess higher biotoxicity. , However, in the field of petroleum organic geochemistry, CAs are valuable molecular markers to study the origin, , evolution, , migration, ,, and biodegradation − of oil.…”

Section: Introductionmentioning

confidence: 99%

Carboxylic Acids in Petroleum: Separation, Analysis, and Geochemical Significance

et al. 2021

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Carboxylic acids (CAs), common oxygen-containing compounds in petroleum samples, have been paid high attention in several areas, including petroleum geochemistry, petroleum processing, and petroleum pollution research. This paper focuses on the overview of separation and analysis of CAs in petroleum and its geochemical significance. The first section describes those studies that have aimed to separate and enrich CAs from the extremely complex petroleum samples prior to instrumental analysis. In the second section, the methods for identifying and quantifying CAs are discussed, in which massspectrometry-based methods are highlighted because of their superior performances in qualitative and quantitative analyses of individual CAs. The third section presents the studies on the geochemical expression of CAs in crude oils and hydrocarbon source rocks. This includes the investigations of CAs as molecular markers in research of the origin, migration, and biodegradation of oil.

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“…According to the current domestic demand, the use of high-acid crude oil is increasing. The current production of high-acid crude oil accounts for approximately 5% of the total global crude oil production each year and is increasing at an annual rate of 0.3% on average [2]. Naphthenic acids (NAs) are the primary acid component in high-acid crude oil, and its weight ratio in crude oil is 1-2% [3,4].…”

Section: Introductionmentioning

confidence: 99%

Toxicity of Naphthenic Acids on the Chlorophyll Fluorescence Parameters and Antioxidant Enzyme Activity of Heterosigma akashiwo

et al. 2021

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Petroleum hydrocarbons can serve as a carbon source for marine phytoplankton; so, marine high-acid crude oil pollution events are likely to result in algal outbreaks or harmful algal blooms (HABs) in surface waters. Naphthenic acids (NAs) are the primary acidic component of crude oil, and red tide is of great concern due to its high diffusivity and strong destructive properties. It is important to study the mechanism of the toxic effect of NAs on the typical red tide algae, Heterosigma akashiwo, for the balance and stability of marine algae. The mechanism of NAs’ damage effect was investigated in terms of the antioxidant enzyme activity, cell number, the chlorophyll positive fluorescence parameters, and the cell morphology of microalgae. Experiments confirmed the hormesis of low-concentration (0.5, 2, and 4 mg/L) NAs on Heterosigma akashiwo, and the indicators of high-concentration (8 and 16 mg/L) NA exposures showed inhibition. In this study, the toxic effect of NAs on the target organism showed a clear concentration–dose relationship. The 16 mg/L NAs stress caused severe damage to the morphology and structure of the target biological cells in a short time (96 h), and the population growth decreased. The target organisms showed a staged oxidative stress response to NAs. The behavior in the low-concentration treatment groups showed toxicant excitatory effects on the photosynthetic efficiency and antioxidant enzyme activity of the target organisms. This study provides theoretical and practical data for the development of an important toxicological model of the toxicant’s excitement effects and antioxidant defense mechanisms. In addition, it provides prospective research data for the prediction and avoidance of ecological risk from NA pollution in marine environments.

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Variation and distribution of naphthenic acids in Dalian Bay sediment

Cited by 14 publications

References 25 publications

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

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

Carboxylic Acids in Petroleum: Separation, Analysis, and Geochemical Significance

Toxicity of Naphthenic Acids on the Chlorophyll Fluorescence Parameters and Antioxidant Enzyme Activity of Heterosigma akashiwo

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