Distribution and sources of n-alkanes and polycyclic aromatic hydrocarbons in shellfish of the Egyptian Red Sea coast

Nemr, Ahmed El; Moneer, Abeer A.; Ragab, Safaa; El-Sikaily, Amany

doi:10.1016/j.ejar.2016.05.003

Cited by 56 publications

(30 citation statements)

References 33 publications

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“…) (Harji et al ). The average chain length (ACL) ranges from 29.5 to 31.2 (average 30.8) for all three lagoons, suggesting no major environmental changes in the ecosystem during the analyzed period (El Nemr et al ).…”

Section: Resultsmentioning

confidence: 99%

“…c). These high CPI values for all three lagoons indicate that the n ‐alkanes are predominantly derived from terrestrial vascular plant waxes (Harji et al ; El Nemr et al ). The slightly lower CPI value (3.5) at 17 cm in the Lagoa Salgada core suggests that higher plant inputs are admixed with contributions from other (microbial) sources.…”

Section: Discussionmentioning

confidence: 97%

“…). No distinct down‐core variations in ACL—a proxy for vegetation type—were evident for the three lagoon cores, suggesting no major ecosystem change during the analyzed period (El Nemr et al ). The TAR and LC/SC provide an assessment of the terrigenous vs. aquatic organic matter inputs.…”

Section: Discussionmentioning

confidence: 99%

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Oceanographic and sedimentological influences on carbonate geochemistry and mineralogy in hypersaline coastal lagoons, Rio de Janeiro state, Brazil

Nascimento

Eglinton

Haghipour

et al. 2019

Limnology & Oceanography

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The Região dos Lagos situated along the coast east of Rio de Janeiro, Brazil, is dominated by a semiarid microclimate attributed to the occurrence of oceanographic upwelling at nearby Cabo Frio. The upwelling is strongly associated with the dominance of NE winds during austral spring/summer and the directional change of the shoreline orientation. Some coastal hypersaline lagoons from this region have been studied intensively over the last 25 yr because they represent relatively rare sites of modern primary dolomite precipitation. Comparison of environmental signals in three lagoons indicates that during the last ~ 3.0 kyr, changes in oceanographic parameters may have influenced biogeochemical processes associated with the production of carbonate‐bearing sediments. The timing of a decrease in sea level may have influenced a period of more intense upwelling, which coincides with precipitation of stoichiometric dolomite at ~ 2.3 kyr BP in the lagoons located along the coast directly west of Cabo Frio. The dolomite found in the lower sections of cores from Lagoa Vermelha and Brejo do Espinho contains more positive δ18O values, indicating greater evaporation with a period of increased semiarid conditions corresponding to greater terrestrial input. The lower δ13C values indicate re‐equilibration with the input of new carbonate ions derived from the decomposition of organic matter during dolomite formation. In contrast, the sediment core from Lagoa Salgada, located northeast of Cabo Frio, contains no dolomite, and very positive δ13C values recorded in carbonate sediments are attributed to microbially mediated methanogenesis, whereas δ18O values remain relatively constant throughout the core at around zero.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

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Oceanographic and sedimentological influences on carbonate geochemistry and mineralogy in hypersaline coastal lagoons, Rio de Janeiro state, Brazil

Nascimento

Eglinton

Haghipour

et al. 2019

Limnology & Oceanography

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“…However, the ratio of LMW/HMW is close to 1 at stations II, IV, VI and VII, suggesting petroleum and plankton sources of n-alkanes. The Terrigenous/Aquatic Ratio (TAR) is >1 for terrestrial input and <1 for aquatic input (El Nemr et al, 2016). The ratio is higher than 1 at stations I, III, V, VIII and IX indicating terrestrial inputs over aquatic inputs.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, some hydrocarbons are derived from biogenic origins (Farid et al, 2016). The oil contaminants causes serious pollution in water ecosystems and direct damage to living organisms and human health (El Nemr et al, 2016). The fate of petroleum hydrocarbons in the aquatic environment is subject to complex and interrelated physical and chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Aliphatic Hydrocarbons in Sediments of Shatt Al-Arab River, Southern Iraq, North East Arabian Gulf

Farid¹

2017

American Journal of Environmental Sciences

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Shatt Al-Arab River is one of the important rivers for water supply, industry and irrigation in Basrah City, south of Iraq. It's also supply drinking water to users in the region. Despite the significance of this river, there is a lack of previous studies dealing with petroleum pollution especially for geochemical studies of organic matter in the river sediments using molecular tracer methods. Therefore, the identification and quantification of petroleum hydrocarbons in this river at the elemental and molecular levels will be of the utmost interest. Sediments were analyzed in nine Shatt Al-Arab River stations. Texture was silty clay or silty sand. TOC and TN ranged from 0.39-0.90 and 0.02-0.16%. OM varied from 17.43-34.36 µg g −1 dw, representing 0.27-0.87% of TOC. AHs ranged from 3.19-10.27 µg g −1 dw and constituted 16.07-29.88% of OM. Total n-alkanes concentrations ranged from 0.08-42.58 µg g −1 dw with carbon numbers from C11-C34 were identified. N-alkanes content was relatively moderate compared to sites contaminated with oil worldwide. Dominance of even carbon number n-alkanes (C11-C20) with CPI and LMW/HMW values close to unity, indicated to oilrelated n-alkanes. This was verified by the values of U/R (1.27-2.45), pri/phy (0.82-1.00), C17/pri (0.70-1.94) and C18/phy (0.95-1.56) ratios and the presence of UCM. Biogenic contributions were detected within the n-alkanes distribution of C17-C31 and CPI and LMW/HMW values of <1 that mainly related to terrestrial plants, phytoplankton, algae and bacteria sources, confirmed by TAR (0.79-2.15) and C31/C19 ratio (0.28-1.62) values. However, the contribution from biogenic hydrocarbons is overshadowed by petroleum origin n-alkanes. This was obvious by the presence of UCM. PCA showed concordant results with n-alkanes ratios indicating mixed n-alkanes sources in sediments. Hopanes and steranes in sediments displayed similar signatures that were characteristic of mature organic matter contribution from oil contaminations.

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Phenol Degradation from Industrial Wastewater by Engineered Microbes

Rathna¹,

Nakkeeran²

2017

Energy, Environment, and Sustainability

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Distribution and sources of n-alkanes and polycyclic aromatic hydrocarbons in shellfish of the Egyptian Red Sea coast

Cited by 56 publications

References 33 publications

Oceanographic and sedimentological influences on carbonate geochemistry and mineralogy in hypersaline coastal lagoons, Rio de Janeiro state, Brazil

Oceanographic and sedimentological influences on carbonate geochemistry and mineralogy in hypersaline coastal lagoons, Rio de Janeiro state, Brazil

Assessment of Aliphatic Hydrocarbons in Sediments of Shatt Al-Arab River, Southern Iraq, North East Arabian Gulf

Phenol Degradation from Industrial Wastewater by Engineered Microbes

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