Source Characterization and Historical Trend of Sedimentary PAHs from Refome Lake, South–South Nigeria

Oyo-Ita, Inyang O.; Oyo-Ita, Orok E.; Ikip, Ekpo Offem; Sam, Edidiong S.; Ugim, Ugim S.

doi:10.1007/s10498-017-9327-5

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…Refome Lake was chosen for the study on the following basis: 1) unique relief that allows minimal run-off, 2) investigation of inputs from atmospheric precipitation is easy and 3) authoustonous production can be assessed readily. A few organic geochemical studies that delineated the historical trends in the distribution of natural and anthropogenic biomarkers and PAHs have been reported previously by us for the lake (Oyo-ita et al, 2016;Oyo-ita et al, 2017). The present report is part of an overall project entitled "Organic Tracers of Toxicity in the Environment of Niger Delta (OTTEND)" aimed at assessing the potential risk and toxicity posed by certain pollutants in the drainage basin of Niger Delta.…”

Section: Introductionmentioning

confidence: 83%

“…Detailed information about the study area is as described in (Oyo-ita et al, 2017;CRBDA, 1982;Ekwueme et al, 1995). Briefly, Refome Lake is a remote semi-enclosed small lake inthe southeast Niger Delta drainage basin, located at 80 E and 5.80 N inCross River State, Nigeria with a surface area of ~2 km 2 and a maximum depth of ~10 m at the center.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Toxicity Potential of Sedimentary PAHS from Refome Lake, South-East Nigeria over the Last Century

Oyo-Ita¹,

Oyo-Ita²,

Ikip³

et al. 2020

GEP

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In this study, toxic equivalent factors and sediment quality guidelines were employed for the assessment of toxicity potential of PAHs in 2 sediment cores collected from the center (RC) and shoreline (RS) of Reforme lake, SE Nigeria over the last ~1 century. Boundary cross plots of isomeric ratios such as Ant/Ant + Phe (>0.1) vs. Fl/Fl + Pyr (>0.4) and BaA/BaA + Chry (>0.35) vs. Icdp/Icdp + Bper (>0.2) indicated biomass combustion/domestic coal utilization as the main sources of PAHs input. The result revealed toxicity unit indices (TU1, 1.22-1.57) for the two cores were above the thresholds of no effect. The highest TU1 value found in the near-bottom layer (RS5, 20-25 cm) of the RS corresponding to geological time-frame ~1930-1947 coincided with the period of inhabitation by the European settlers along the lake's catchments when coal or coal products utilization for domestic and recreational purposes was at its peak. On the other hand, TU2 values were <1 at all depth intervals, revealing unlikely PAH effects to resident organisms. Total toxicity equivalency factors (TEqFs) for the surface sediment of RS and RC were 9.29 ng/g TEqFs and 9.16 ng/g TEqFs, respectively, and indicated that more attention should be paid to BaPyr accumulation in the lake's sediment.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Assessment of Toxicity Potential of Sedimentary PAHS from Refome Lake, South-East Nigeria over the Last Century

Oyo-Ita¹,

Oyo-Ita²,

Ikip³

et al. 2020

GEP

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“…Extensive studies of temporal trends in aromatic hydrocarbons deposition in sediment cores have been documented worldwide (eg. Guo et al 2010;Zhang et al 2013;Oyo-Ita et al 2017) and most reveal a good correlation between these trends and their vertical distributions. However, knowledge of such a correspondence in the case of aliphatic hydrocarbons is scarce, particularly for the tropical sub-saharan African sedimentary environment.…”

Section: Introductionmentioning

confidence: 84%

“…As time has progressed, the deposition of hydrocarbons led to changes in the quality and quantity of OM influx at different sediment depths. Previous studies indicate that the contamination characteristics of certain organic contaminants in sediments are clearly diverse in different years due to industrial development and changes in the energy condition of the environment (Guo et al 2010;Oyo-Ita et al 2017). Therefore, it is important to examine the historical trends in aliphatic hydrocarbons deposition in sediment cores.…”

Section: Introductionmentioning

confidence: 99%

“…The present study is the first investigation of historical trends in aliphatic hydrocarbons deposition in dated sediments from the Imo River aimed at identifying the effect of human activity/climate change on the study area over the last few decades. Previous organic geochemical studies of the river sediment focused mainly on the surface sediment samples including the distributions and sources of petroleum hydrocarbons (Oyo-Ita et al 2016), polycyclic aromatic hydrocarbons (PAHs) in sediments and soils from oil exploration areas (Sojino et al 2010), distribution of fossil fuel biomarkers (Ekpo et al 2012) and fatty acids and alkanols distribution and sources (Oyo-Ita and Oyo-Ita 2013) as well as toxicological assessment of PAHs (Oyo-Ita et al 2017). The present report was intended to chronicle the natural and humans-induced events that occurred after the period of oil discovery in commercial quantity in Nigeria in 1956 to ca.…”

Section: Introductionmentioning

confidence: 99%

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Aliphatic Hydrocarbons in Recent Dated Sediment Cores of Imo River, SE Nigeria: Environmental/Historical Implications

Oyo-Ita¹,

Umoh²,

Ugim³

et al. 2020

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Four recent sediment cores (0-30 cm long) from Afam (AF), Mangrove (MG), Estuary (ES) and illegal Petroleum refinery (PT) sites of the Imo River, Southeastern Nigeria were analyzed to characterize the sources and distribution of organic matter (OM), as well as examine their historical trends of deposition and assess human-induced changes in the last ca. 5 decades using biomarker approach. Radionuclides 210Pb and 137Cs were used to assign approximate dates to each section of the cores. Evaluation of proxy parameters such as carbon preference index (CPI, 2.01 - 2.19), carbon number maximum (Cmax, 29, 31) and atomic C/N (16.51-31.32) for the most recent top layers (0-5 cm) revealed greater wash-in of land-derived organic matter (OM), attributable to the recent rise in water height. The bottom layer (PT1, 25-30 cm,) of the PT core deposited ca. 1964-1972 exhibited a CPI of 0.97 and pristane/phytane (Pr/Ph, 3.75), suggesting that oil bunkering/illegal refinery activity had begun in the region ca. 8 years after the first commercial discovery of oil in Nigeria in 1956. The occurrence in high abundance of heptadecane in the middle layer (ES4, 10-15 cm) of the ES almost corresponded with the period of eutrophication that blocked the waterway in the late 1980s. Measurement of a marked unresolved complex mixture at the near-top layer (AF5, 5-10 cm) of the AF indicated that the heaviest contamination by petroleum hydrocarbons occurred at ca. 1997-2005. This time frame coincided with the period of intensive bunkering and oil pipeline vandalism by Niger Delta militant groups.

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Industrial and wildfire aerosol pollution over world heritage Lake Baikal

Popovicheva

Molozhnikova

Насонов

et al. 2021

Journal of Environmental Sciences

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Source Characterization and Historical Trend of Sedimentary PAHs from Refome Lake, South–South Nigeria

Cited by 7 publications

References 32 publications

Assessment of Toxicity Potential of Sedimentary PAHS from Refome Lake, South-East Nigeria over the Last Century

Assessment of Toxicity Potential of Sedimentary PAHS from Refome Lake, South-East Nigeria over the Last Century

Aliphatic Hydrocarbons in Recent Dated Sediment Cores of Imo River, SE Nigeria: Environmental/Historical Implications

Industrial and wildfire aerosol pollution over world heritage Lake Baikal

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