Biomarkers as indicators of sedimentary organic matter sources and early diagenetic transformation of pentacyclic triterpenoids in a tropical mangrove ecosystem

Kumar, Mukesh; Boski, Tomász; Lima-Filho, Francisco Pinheiro; Bezerra, Francisco H.R.; Vila, Francisco Javier González; Bhuiyan, Md. Khurshid Alam; González‐Pérez, José Antonío

doi:10.1016/j.ecss.2019.106403

Cited by 21 publications

(13 citation statements)

References 108 publications

(127 reference statements)

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“…The OM diagenesis in coastal sediments also modifies steroid precursor structures in several ways. The diagenetic dehydration of sterols leads to the formation of unsaturated steranes (sterenes and steradienes) (Mackenzie et al 1982;Brassell et al 1984;Kumar et al 2019). The unsaturated sterane series found here is well in line with previous studies from Santa Olalla lagoon (SW Iberian Peninsula, Spain) (Grimalt et al 1991).…”

Section: Steranessupporting

confidence: 91%

“…These alkanones have been detected in many sedimentary environments vegetated with seagrasses, salt marshes and mangrove forest, with molecular distribution typically showing a Cmax at the C 25 , C 27 or C 29 homologues (e.g. Hernandez et al 2001;Jaffé et al 2001;Gonzalez-Vila et al 2003;De la Rosa et al 2012;Kumar et al 2019). Long-chain n-alkane-2-ones (> C 25 ) with Cmax at C 27 , C 29 and C 31 homologues have been also found in terrestrial plants and specifically in the salt marsh Juncus spp.…”

Section: Acyclic Methyl Ketones (N-alkan-2-ones)mentioning

confidence: 99%

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Discerning natural and anthropogenic organic matter inputs to salt marsh sediments of Ria Formosa lagoon (South Portugal)

Kumar

Boski

González-Vila

et al. 2020

Environ Sci Pollut Res

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Sedimentary organic matter (OM) origin and molecular composition provide useful information to understand carbon cycling in coastal wetlands. Core sediments from threors' Contributionse transects along Ria Formosa lagoon intertidal zone were analysed using analytical pyrolysis (Py-GC/MS) to determine composition, distribution and origin of sedimentary OM. The distribution of alkyl compounds (alkanes, alkanoic acids and alkan-2-ones), polycyclic aromatic hydrocarbons (PAHs), lignin-derived methoxyphenols, linear alkylbenzenes (LABs), steranes and hopanes indicated OM inputs to the intertidal environment from natural-autochthonous and allochthonous-as well as anthropogenic. Several n-alkane geochemical indices used to assess the distribution of main OM sources (terrestrial and marine) in the sediments indicate that algal and aquatic macrophyte derived OM inputs dominated over terrigenous plant sources. The lignin-derived methoxyphenol assemblage, dominated by vinylguaiacol and vinylsyringol derivatives in all sediments, points to large OM contribution from higher plants. The spatial distributions of PAHs (polyaromatic hydrocarbons) showed that most pollution sources were mixed sources including both pyrogenic and petrogenic. Low carbon preference indexes (CPI > 1) for n-alkanes, the presence of UCM (unresolved complex mixture) and the distribution of hopanes (C 29 -C 36 ) and steranes (C 27 -C 29 ) suggested localized petroleum-derived hydrocarbon inputs to the core sediments. Series of LABs were found in most sediment samples also pointing to domestic sewage anthropogenic contributions to the sediment OM.

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Section: Steranessupporting

confidence: 91%

Section: Acyclic Methyl Ketones (N-alkan-2-ones)mentioning

confidence: 99%

Discerning natural and anthropogenic organic matter inputs to salt marsh sediments of Ria Formosa lagoon (South Portugal)

Kumar

Boski

González-Vila

et al. 2020

Environ Sci Pollut Res

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“…Further indexes have been examined in order to put in evidence the impact of vegetation (Kumar et al 2019 ). Among them, there are (i) the homolog (C max ) corresponding to the maximum concentration within the n-alkane distribution; (ii) the cumulative percentage attributable to natural waxes (NW%) (Alves et al 2001 , 2011 ; Rabhi et al 2018 ); and (iii) the average chain length of n-alkanes (ACL) (Leider et al 2013 ).…”

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

confidence: 99%

“…They display the predominance of even carbon homologs and are among the principal components of organic aerosols in rural regions (Simoneit and Mazurek 1982 ). Many sterols also (including campesterol, sitosterol, stigmasterol, and amyrins) have been associated to vegetation as components of epicuticular waxes (Guo et al 2019 ; Kumar et al 2019 ; Gal et al 2022 ). The most important exception is cholesterol, which has been recognized as a tracer of meat cooking (Cass 1998 ; Carreira et al 2009 ).…”

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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Fractionation and provenances of rare earth elements in coastal sediments in tropical China

2021

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Biomarkers as indicators of sedimentary organic matter sources and early diagenetic transformation of pentacyclic triterpenoids in a tropical mangrove ecosystem

Cited by 21 publications

References 108 publications

Discerning natural and anthropogenic organic matter inputs to salt marsh sediments of Ria Formosa lagoon (South Portugal)

Discerning natural and anthropogenic organic matter inputs to salt marsh sediments of Ria Formosa lagoon (South Portugal)

Molecular signatures of organic particulates as tracers of emission sources

Fractionation and provenances of rare earth elements in coastal sediments in tropical China

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