Normal alkanes in sediments from the Persian Gulf: spatial pattern and implications for autochthonous, allochthonous, and petroleum-originated contaminants

Aghadadashi, Vahid; Mehdinia, Ali; Molaei, Saeideh

doi:10.1007/s10661-021-09122-x

Cited by 12 publications

(5 citation statements)

References 36 publications

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“…Nevertheless, sometimes a distinct fingerprint is observed in the semi-volatile range, where the even homologs are predominant. This pattern seems typical of sediments (Zrafi-Nouira et al 2008, Sikes et al 2009, Aloulou et al 2010, Jafarabadi et al 2018, Aghadadashi et al 2021, Arshinova et al 2021); nevertheless, it has been observed also in effluents from petroleum-contaminated zones and has been interpreted as a tracer of microorganisms including bacteria, fungi and spores (Stortini et al 2009;Kuhn et al 2010;Leider et al 2013). Hence, the molecular signature over the whole nC 14 -nC 40 range is more complex than as researchers currently believe and is not yet completely understood.…”

Section: N-alkanesmentioning

confidence: 96%

“…Examples of in-field monitoring aimed at discriminating the sources of organic fraction of airborne particulates, sediments, and waters are Aghadadashi et al ( 2021 ), Aloulou et al ( 2010 ), Alves et al ( 2001 ), Balducci et al ( 2014 ), Bi et al ( 2008 ), Gal et al ( 2022 ), Kang et al ( 2018 ), and Khedidji et al ( 2017 ).…”

Section: The State-of-the-art Of Research About Molecular Signatures ...mentioning

confidence: 99%

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Molecular signatures of organic particulates as tracers of emission sources

Cecinato

Bacaloni

Romagnoli

et al. 2022

Environ Sci Pollut Res

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Chemical signature of airborne particulates and deposition dusts is subject of study since decades. Usually, three complementary composition markers are investigated, namely, (i) specific organic compounds; (ii) concentration ratios between congeners, and (iii) percent distributions of homologs. Due to its intrinsic limits (e.g., variability depending on decomposition and gas/particle equilibrium), the identification of pollution sources based on molecular signatures results overall restricted to qualitative purposes. Nevertheless, chemical fingerprints allow drawing preliminary information, suitable for successfully approaching multivariate analysis and valuing the relative importance of sources. Here, the state-of-the-art is presented about the molecular fingerprints of non-polar aliphatic, polyaromatic (PAHs, nitro-PAHs), and polar (fatty acids, organic halides, polysaccharides) compounds in emissions. Special concern was addressed to alkenes and alkanes with carbon numbers ranging from 12 to 23 and ≥ 24, which displayed distinct relative abundances in petrol-derived spills and exhausts, emissions from microorganisms, high vegetation, and sediments. Long-chain alkanes associated with tobacco smoke were characterized by a peculiar iso/anteiso/normal homolog fingerprint and by n-hentriacontane percentages higher than elsewhere. Several concentration ratios of PAHs were identified as diagnostic of the type of emission, and the sources of uncertainty were elucidated. Despite extensive investigations conducted so far, the origin of uncommon molecular fingerprints, e.g., alkane/alkene relationships in deposition dusts and airborne particles, remains quite unclear. Polar organics resulted scarcely investigated for pollution apportioning purposes, though they looked as indicative of the nature of sources. Finally, the role of humans and living organisms as actual emitters of chemicals seems to need concern in the future.

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Section: N-alkanesmentioning

confidence: 96%

Section: The State-of-the-art Of Research About Molecular Signatures ...mentioning

confidence: 99%

Molecular signatures of organic particulates as tracers of emission sources

Cecinato

Bacaloni

Romagnoli

et al. 2022

Environ Sci Pollut Res

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“…n-Alkanes are the most susceptible to microbiological transformations of all hydrocarbons due to their simple structure and relatively weak bond between carbon atoms [7]. However, in the case of contamination, n-alkanes are never present in the environment individually but rather as a complex mixture of different hydrocarbon groups, with different physicochemical characteristics, and therefore variable environmental impact [19,20]. The dominance of n-alkanes with odd numbers of carbon atoms as well as the dominance of individual sterane and terpene homologs provide a specification of the anthropogenic source of pollution [21].…”

Section: Introductionmentioning

confidence: 99%

“…The dominance of n-alkanes with odd numbers of carbon atoms as well as the dominance of individual sterane and terpene homologs provide a specification of the anthropogenic source of pollution [21]. Based on the dominance of short-chain (C15, C17, and C19) and longchain (C27, C29, and C31) n-alkanes, it can be concluded whether it is an algal or sedimentary origin of hydrocarbons [17,20,22,23]. The biomarker group also includes steranes and terpenes, semi-volatile compounds that are formed during the biological decomposition of algae, bacteria, and vascular plants.…”

Section: Introductionmentioning

confidence: 99%

Gas chromatography‐mass spectrometry in assessment of road run‐off sediment quality parameters

Koljančić

Samelak

Balaban

et al. 2022

Separation Science Plus

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Surface sediment samples were collected in the Banja Luka city area, near heavy traffic roads and the Vrbas river basin, in order to determine the origin of the organic substance. For this purpose, soluble organic substances were extracted by the Soxhlet method, and extracts were fractionated by the method of column chromatography into a group of saturated hydrocarbons, aromatic hydrocarbons, and polar compounds. The total amount of soluble organic substance was in the range of 1185-3050 μg/kg. Fractions were analyzed by gas chromatography-mass spectrometry method using a non-polar HP-5 ms stationary phase with a He 99.999% flow rate of 1 ml/min. Based on the chromatograms characteristic for n-alkanes m/z 71, steranes m/z 217, and terpenes m/z 191, the specific n-alkanes range was determined (n-C14-n-C39). n-Alkanes domination of odd/even C-number and carbon preference index values ranged from 1.12-2.48. The calculated parameters showed that the organic substance in the samples is of sedimentary origin with a significant anthropogenic input. In addition, based on the analysis of aromatic fractions and the detected unresolved complex mixture, the microbiological degradation of organic substance was determined.

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“…On the contrary, the main peak carbon of high maturity oil is small, commonly C 5 or C 6 . The chromatographic curve is relatively smooth, with the CPI and OEP close to 1 [17][18][19][20][21][22]. Furthermore, the baseline bump of the chromatographic curve represents the existence of unresolved complex mixtures (UCM), which are formed by the strong biodegradation of oil in geological history [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Origin and Characteristics of the Crude Oils and Condensates in the Callovian-Oxfordian Carbonate Reservoirs of the Amu Darya Right Bank Block, Turkmenistan

et al. 2022

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The Amu Darya Right Bank Block is located northeast of the Amu Darya basin, a large petroliferous sedimentary basin, with abundant natural gas resources in carbonate rocks under the ultra-thick gypsum-salt layer. Oil fields producing crude oils have recently been found around large gas fields. Unraveling the origins of the crude oils is crucial for effective petroleum exploration and exploitation. The origin of gas condensates and crude oils was unraveled through the use of comprehensively analytical and interpretative geochemical approaches. Based on oil-source correlation, the reservoir forming process has been restored. The bulk geochemical parameters of the local source rocks of the ADRBB indicated that the local sources have hydrocarbon generation and accumulation potential. The middle-lower Jurassic coal-bearing mudstone is gas prone, while the mudstone of the Callovian-Oxfordian gap layer is oil prone, and the organic matter type of Callovian-Oxfordian carbonate rocks is the mixed type between the two previous source rocks. The interpretation schemes for compositions of n-alkanes, pristane and phytane, C27–C28–C29 sterane distributions, C19+C20–C21–C23 tricyclic terpane distributions, extended tricyclic terpane ratio, and δ13C indicated that crude oil is likely from marine organic matter, while condensates mainly originate from terrestrial organic matter. However, from the perspective of the 18α-trisnorneohopane/17α-trisnorhopane and isomerization ratio of C29 sterane, condensates are too mature to have originated in the local source rocks of the ADRBB, whose maturity is well comparable with that of crude oils. The geochemical, geologic, and tectonic evolutions collectively indicate that the crude oils were most likely generated and migrated from the relatively shallow, lowly mature gap layer and Callovian-Oxfordian carbonate rocks of the ADRBB, while the condensates mostly originated from the relatively deep and highly mature middle-lower coal-bearing mudstone and Callovian-Oxfordian carbonate rocks in the Murgab depression in the southeast of the basin. Basement faults are the key factors affecting the types of oil and gas reservoirs. During the periods of oil and gas migration, traps with basement faults mainly captured natural gas and condensates and traps without basement faults were enriched with crude oils generated from local source rocks.

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Normal alkanes in sediments from the Persian Gulf: spatial pattern and implications for autochthonous, allochthonous, and petroleum-originated contaminants

Cited by 12 publications

References 36 publications

Molecular signatures of organic particulates as tracers of emission sources

Molecular signatures of organic particulates as tracers of emission sources

Gas chromatography‐mass spectrometry in assessment of road run‐off sediment quality parameters

Origin and Characteristics of the Crude Oils and Condensates in the Callovian-Oxfordian Carbonate Reservoirs of the Amu Darya Right Bank Block, Turkmenistan

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