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Risk assessment of PAHs and N-PAH analogues in sediment cores from the Niger Delta

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Risk assessment of PAHs and N-PAH analogues in sediment cores from the Niger Delta. / Anyanwu, I.N.; Sikoki, F.D.; Semple, K.T.

In: Marine Pollution Bulletin, Vol. 161, 111684, 01.12.2020.

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Anyanwu, I.N. ; Sikoki, F.D. ; Semple, K.T. / Risk assessment of PAHs and N-PAH analogues in sediment cores from the Niger Delta. In: Marine Pollution Bulletin. 2020 ; Vol. 161.

Bibtex

@article{abb97a91b20c468eb9df7c1c8ec6a065,
title = "Risk assessment of PAHs and N-PAH analogues in sediment cores from the Niger Delta",
abstract = "Chemical-surveys of sediments are source of information about historical-pollution in aquatic-ecosystems, because ecological/human-health risks may arise from polycyclic-aromatic-hydrocarbons (PAHs) and nitrogen-PAHs presence in aquatic-environments, particularly sediments, where they partition. Despite this, sediment-PAHs/N-PAHs have not been reported in the Niger Delta. This study investigated vertical-profiles of PAHs/N-PAHs in 2 cm-intervals-segments from Bonny Estuary, Niger Delta. Analysis showed that ƩPAHs/ƩN-PAHs in segments ranged from 8699 to 22,528 μg/kg and 503 to 2020 μg/kg, respectively. Abundant-PAH/N-PAH are 2,6-dimethyl-naphthalene and benzo[a]acridine. PAHs/N-PAHs in the samples appeared to be from petrogenic and pyrogenic-sources. Petrogenic-PAHs/N-PAHs were predominated by 2-, 3-rings, alkylated-substituents, while, pyrogenic-PAHs/N-PAHs were dominated by 4-, 5-, 6-rings. Surface-sediments were dominated by petrogenic-PAHs/N-PAHs while, deeper-cores were heavily-contaminated with pyrogenic-PAHs/N-PAHs. ƩPAHs exceeded the ISQGs and PELs of CSQGs. Ʃ-quinoline/Ʃ-acridine exceeded the guidelines for protection of aquatic-life. Furthermore, there are concerns over toxic-ratios >70% in the estuary. Such surveys may be helpful in future sediment-management-decisions for contaminated-systems and long-term-monitoring of sediments to assess remediation/recovery. Capsule: Distinct sources of PAHs and N-PAHs exist in the Niger Delta ecosystem and, there are concerns over toxic ratios >70% in the oil rich region and the potential for adverse biological effects.  ",
keywords = "Estuary, N-PAHs, Niger Delta, PAHs, Petrogenic, Pyrogenic, Aquatic ecosystems, Decision support systems, Risk assessment, Sediments, Surveys, Aquatic environments, Biological effects, Long term monitoring, Polycyclic aromatic hydrocarbons (PAHS), Sediment core, Sediment management, Surface sediments, Vertical profile, Polycyclic aromatic hydrocarbons, estuary, nitrogen, PAH, pollutant source, risk assessment, sediment core, toxicity, Bonny Estuary, Nigeria, Rivers",
author = "I.N. Anyanwu and F.D. Sikoki and K.T. Semple",
year = "2020",
month = dec,
day = "1",
doi = "10.1016/j.marpolbul.2020.111684",
language = "English",
volume = "161",
journal = "Marine Pollution Bulletin",
issn = "0025-326X",
publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - Risk assessment of PAHs and N-PAH analogues in sediment cores from the Niger Delta

AU - Anyanwu, I.N.

AU - Sikoki, F.D.

AU - Semple, K.T.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - Chemical-surveys of sediments are source of information about historical-pollution in aquatic-ecosystems, because ecological/human-health risks may arise from polycyclic-aromatic-hydrocarbons (PAHs) and nitrogen-PAHs presence in aquatic-environments, particularly sediments, where they partition. Despite this, sediment-PAHs/N-PAHs have not been reported in the Niger Delta. This study investigated vertical-profiles of PAHs/N-PAHs in 2 cm-intervals-segments from Bonny Estuary, Niger Delta. Analysis showed that ƩPAHs/ƩN-PAHs in segments ranged from 8699 to 22,528 μg/kg and 503 to 2020 μg/kg, respectively. Abundant-PAH/N-PAH are 2,6-dimethyl-naphthalene and benzo[a]acridine. PAHs/N-PAHs in the samples appeared to be from petrogenic and pyrogenic-sources. Petrogenic-PAHs/N-PAHs were predominated by 2-, 3-rings, alkylated-substituents, while, pyrogenic-PAHs/N-PAHs were dominated by 4-, 5-, 6-rings. Surface-sediments were dominated by petrogenic-PAHs/N-PAHs while, deeper-cores were heavily-contaminated with pyrogenic-PAHs/N-PAHs. ƩPAHs exceeded the ISQGs and PELs of CSQGs. Ʃ-quinoline/Ʃ-acridine exceeded the guidelines for protection of aquatic-life. Furthermore, there are concerns over toxic-ratios >70% in the estuary. Such surveys may be helpful in future sediment-management-decisions for contaminated-systems and long-term-monitoring of sediments to assess remediation/recovery. Capsule: Distinct sources of PAHs and N-PAHs exist in the Niger Delta ecosystem and, there are concerns over toxic ratios >70% in the oil rich region and the potential for adverse biological effects.  

AB - Chemical-surveys of sediments are source of information about historical-pollution in aquatic-ecosystems, because ecological/human-health risks may arise from polycyclic-aromatic-hydrocarbons (PAHs) and nitrogen-PAHs presence in aquatic-environments, particularly sediments, where they partition. Despite this, sediment-PAHs/N-PAHs have not been reported in the Niger Delta. This study investigated vertical-profiles of PAHs/N-PAHs in 2 cm-intervals-segments from Bonny Estuary, Niger Delta. Analysis showed that ƩPAHs/ƩN-PAHs in segments ranged from 8699 to 22,528 μg/kg and 503 to 2020 μg/kg, respectively. Abundant-PAH/N-PAH are 2,6-dimethyl-naphthalene and benzo[a]acridine. PAHs/N-PAHs in the samples appeared to be from petrogenic and pyrogenic-sources. Petrogenic-PAHs/N-PAHs were predominated by 2-, 3-rings, alkylated-substituents, while, pyrogenic-PAHs/N-PAHs were dominated by 4-, 5-, 6-rings. Surface-sediments were dominated by petrogenic-PAHs/N-PAHs while, deeper-cores were heavily-contaminated with pyrogenic-PAHs/N-PAHs. ƩPAHs exceeded the ISQGs and PELs of CSQGs. Ʃ-quinoline/Ʃ-acridine exceeded the guidelines for protection of aquatic-life. Furthermore, there are concerns over toxic-ratios >70% in the estuary. Such surveys may be helpful in future sediment-management-decisions for contaminated-systems and long-term-monitoring of sediments to assess remediation/recovery. Capsule: Distinct sources of PAHs and N-PAHs exist in the Niger Delta ecosystem and, there are concerns over toxic ratios >70% in the oil rich region and the potential for adverse biological effects.  

KW - Estuary

KW - N-PAHs

KW - Niger Delta

KW - PAHs

KW - Petrogenic

KW - Pyrogenic

KW - Aquatic ecosystems

KW - Decision support systems

KW - Risk assessment

KW - Sediments

KW - Surveys

KW - Aquatic environments

KW - Biological effects

KW - Long term monitoring

KW - Polycyclic aromatic hydrocarbons (PAHS)

KW - Sediment core

KW - Sediment management

KW - Surface sediments

KW - Vertical profile

KW - Polycyclic aromatic hydrocarbons

KW - estuary

KW - nitrogen

KW - PAH

KW - pollutant source

KW - risk assessment

KW - sediment core

KW - toxicity

KW - Bonny Estuary

KW - Nigeria

KW - Rivers

U2 - 10.1016/j.marpolbul.2020.111684

DO - 10.1016/j.marpolbul.2020.111684

M3 - Journal article

VL - 161

JO - Marine Pollution Bulletin

JF - Marine Pollution Bulletin

SN - 0025-326X

M1 - 111684

ER -