Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin

Alassane Youssao Abdou Karim; Etiennette Dassi; Finagnon Gabin Laly; Gildas Fiacre Agossou; Djafarou Abdoulaye; Sylvain Zoffoun; Martin Aina; Daouda Mama

doi:doi:10.11648/j.ajpc.20221104.16

Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin

Alassane Youssao Abdou Karim, Etiennette Dassi, Finagnon Gabin Laly, Gildas Fiacre Agossou, Djafarou Abdoulaye, Sylvain Zoffoun, Martin Aina, Daouda Mama

Published in American Journal of Physical Chemistry (Volume 11, Issue 4)

Received: 13 November 2022 Accepted: 28 November 2022 Published: 8 December 2022

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Abstract

Water is an essential resource for maintaining aquatic life and the quality of aquatic products. However, sediments are the most important place of accumulation of metal residues and their remobilization in the food chain. The objective of this work is to study the water physicochemical quality and the mercury contamination levels of the sediments in the Channel of Cotonou and Lac Nokoué. Temperature, pH, conductivity, salinity and dissolved oxygen have been measured on-situ in surface and deep water. The surface sediments have been sampled and analyzed in the laboratory using the cold vapor technique (CV-AAS) by the Direct Mercury Analyzer (DMA 80) for mercury analysis. The characterization of the sediments through the granulometric fractions shows that the channel is sandy due to marine inputs while Lake Nokoué is essentially of the silt-sandy type. Mercury concentrations in Lake Nokoué sediments (up to 130.72 µg/kg) greatly exceed geochemical natural loads (20-30 µg/kg) and reveal mercury contamination; this is the case along the channel where the distribution of these residues is very uneven due to the dilution observed at the mouth by marine inputs from the Atlantic Ocean. According to the results obtained, the sediments of the two ecosystems are of class 6, extremely polluted sediments (Igeo > 5) showing a significant risk of migration of these residues in the food chain, especially for benthic organisms.

Published in	American Journal of Physical Chemistry (Volume 11, Issue 4)
DOI	10.11648/j.ajpc.20221104.16
Page(s)	128-138
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

Mercury, Contamination, Sediments, Channel, Nokoué Lake, Ecosystem

References

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Alassane Youssao Abdou Karim, Etiennette Dassi, Finagnon Gabin Laly, Gildas Fiacre Agossou, Djafarou Abdoulaye, et al. (2022). Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin. American Journal of Physical Chemistry, 11(4), 128-138. https://doi.org/10.11648/j.ajpc.20221104.16

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ACS Style

Alassane Youssao Abdou Karim; Etiennette Dassi; Finagnon Gabin Laly; Gildas Fiacre Agossou; Djafarou Abdoulaye, et al. Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin. Am. J. Phys. Chem. 2022, 11(4), 128-138. doi: 10.11648/j.ajpc.20221104.16

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AMA Style

Alassane Youssao Abdou Karim, Etiennette Dassi, Finagnon Gabin Laly, Gildas Fiacre Agossou, Djafarou Abdoulaye, et al. Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin. Am J Phys Chem. 2022;11(4):128-138. doi: 10.11648/j.ajpc.20221104.16

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@article{10.11648/j.ajpc.20221104.16,
  author = {Alassane Youssao Abdou Karim and Etiennette Dassi and Finagnon Gabin Laly and Gildas Fiacre Agossou and Djafarou Abdoulaye and Sylvain Zoffoun and Martin Aina and Daouda Mama},
  title = {Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin},
  journal = {American Journal of Physical Chemistry},
  volume = {11},
  number = {4},
  pages = {128-138},
  doi = {10.11648/j.ajpc.20221104.16},
  url = {https://doi.org/10.11648/j.ajpc.20221104.16},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpc.20221104.16},
  abstract = {Water is an essential resource for maintaining aquatic life and the quality of aquatic products. However, sediments are the most important place of accumulation of metal residues and their remobilization in the food chain. The objective of this work is to study the water physicochemical quality and the mercury contamination levels of the sediments in the Channel of Cotonou and Lac Nokoué. Temperature, pH, conductivity, salinity and dissolved oxygen have been measured on-situ in surface and deep water. The surface sediments have been sampled and analyzed in the laboratory using the cold vapor technique (CV-AAS) by the Direct Mercury Analyzer (DMA 80) for mercury analysis. The characterization of the sediments through the granulometric fractions shows that the channel is sandy due to marine inputs while Lake Nokoué is essentially of the silt-sandy type. Mercury concentrations in Lake Nokoué sediments (up to 130.72 µg/kg) greatly exceed geochemical natural loads (20-30 µg/kg) and reveal mercury contamination; this is the case along the channel where the distribution of these residues is very uneven due to the dilution observed at the mouth by marine inputs from the Atlantic Ocean. According to the results obtained, the sediments of the two ecosystems are of class 6, extremely polluted sediments (Igeo > 5) showing a significant risk of migration of these residues in the food chain, especially for benthic organisms.},
 year = {2022}
}

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TY  - JOUR
T1  - Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin
AU  - Alassane Youssao Abdou Karim
AU  - Etiennette Dassi
AU  - Finagnon Gabin Laly
AU  - Gildas Fiacre Agossou
AU  - Djafarou Abdoulaye
AU  - Sylvain Zoffoun
AU  - Martin Aina
AU  - Daouda Mama
Y1  - 2022/12/08
PY  - 2022
N1  - https://doi.org/10.11648/j.ajpc.20221104.16
DO  - 10.11648/j.ajpc.20221104.16
T2  - American Journal of Physical Chemistry
JF  - American Journal of Physical Chemistry
JO  - American Journal of Physical Chemistry
SP  - 128
EP  - 138
PB  - Science Publishing Group
SN  - 2327-2449
UR  - https://doi.org/10.11648/j.ajpc.20221104.16
AB  - Water is an essential resource for maintaining aquatic life and the quality of aquatic products. However, sediments are the most important place of accumulation of metal residues and their remobilization in the food chain. The objective of this work is to study the water physicochemical quality and the mercury contamination levels of the sediments in the Channel of Cotonou and Lac Nokoué. Temperature, pH, conductivity, salinity and dissolved oxygen have been measured on-situ in surface and deep water. The surface sediments have been sampled and analyzed in the laboratory using the cold vapor technique (CV-AAS) by the Direct Mercury Analyzer (DMA 80) for mercury analysis. The characterization of the sediments through the granulometric fractions shows that the channel is sandy due to marine inputs while Lake Nokoué is essentially of the silt-sandy type. Mercury concentrations in Lake Nokoué sediments (up to 130.72 µg/kg) greatly exceed geochemical natural loads (20-30 µg/kg) and reveal mercury contamination; this is the case along the channel where the distribution of these residues is very uneven due to the dilution observed at the mouth by marine inputs from the Atlantic Ocean. According to the results obtained, the sediments of the two ecosystems are of class 6, extremely polluted sediments (Igeo > 5) showing a significant risk of migration of these residues in the food chain, especially for benthic organisms.
VL  - 11
IS  - 4
ER  -

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Author Information

Alassane Youssao Abdou Karim

Applied Chemistry Study and Research Laboratory, Ecotoxicology and Quality Study Research Unit, Cotonou, Benin
Etiennette Dassi

Applied Chemistry Study and Research Laboratory, Ecotoxicology and Quality Study Research Unit, Cotonou, Benin
Finagnon Gabin Laly

Applied Statistic and Biometry Study Research Laboratory, Faculty of Agricultural Sciences (FSA), University of Abomey-Calavi, Abomey-Calavi, Benin
Gildas Fiacre Agossou

Applied Chemistry Study and Research Laboratory, Ecotoxicology and Quality Study Research Unit, Cotonou, Benin
Djafarou Abdoulaye

Applied Chemistry Study and Research Laboratory, Ecotoxicology and Quality Study Research Unit, Cotonou, Benin
Sylvain Zoffoun

Applied Chemistry Study and Research Laboratory, Ecotoxicology and Quality Study Research Unit, Cotonou, Benin
Martin Aina

Environmental Study and Monitoring Laboratory (LESE), Directorate General for Environment and Climate (DGEC), Ministry of the Living Environment and the Sustainable Development, Cotonou, Benin
Daouda Mama

Applied Hydrology Laboratory (LHA), National Water Institute (INE), University of Abomey-Calavi, Abomey-Calavi, Benin

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APA Style

Alassane Youssao Abdou Karim, Etiennette Dassi, Finagnon Gabin Laly, Gildas Fiacre Agossou, Djafarou Abdoulaye, et al. (2022). Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin. American Journal of Physical Chemistry, 11(4), 128-138. https://doi.org/10.11648/j.ajpc.20221104.16

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ACS Style

Alassane Youssao Abdou Karim; Etiennette Dassi; Finagnon Gabin Laly; Gildas Fiacre Agossou; Djafarou Abdoulaye, et al. Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin. Am. J. Phys. Chem. 2022, 11(4), 128-138. doi: 10.11648/j.ajpc.20221104.16

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AMA Style

Alassane Youssao Abdou Karim, Etiennette Dassi, Finagnon Gabin Laly, Gildas Fiacre Agossou, Djafarou Abdoulaye, et al. Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin. Am J Phys Chem. 2022;11(4):128-138. doi: 10.11648/j.ajpc.20221104.16

Copy | Download

@article{10.11648/j.ajpc.20221104.16,
  author = {Alassane Youssao Abdou Karim and Etiennette Dassi and Finagnon Gabin Laly and Gildas Fiacre Agossou and Djafarou Abdoulaye and Sylvain Zoffoun and Martin Aina and Daouda Mama},
  title = {Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin},
  journal = {American Journal of Physical Chemistry},
  volume = {11},
  number = {4},
  pages = {128-138},
  doi = {10.11648/j.ajpc.20221104.16},
  url = {https://doi.org/10.11648/j.ajpc.20221104.16},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpc.20221104.16},
  abstract = {Water is an essential resource for maintaining aquatic life and the quality of aquatic products. However, sediments are the most important place of accumulation of metal residues and their remobilization in the food chain. The objective of this work is to study the water physicochemical quality and the mercury contamination levels of the sediments in the Channel of Cotonou and Lac Nokoué. Temperature, pH, conductivity, salinity and dissolved oxygen have been measured on-situ in surface and deep water. The surface sediments have been sampled and analyzed in the laboratory using the cold vapor technique (CV-AAS) by the Direct Mercury Analyzer (DMA 80) for mercury analysis. The characterization of the sediments through the granulometric fractions shows that the channel is sandy due to marine inputs while Lake Nokoué is essentially of the silt-sandy type. Mercury concentrations in Lake Nokoué sediments (up to 130.72 µg/kg) greatly exceed geochemical natural loads (20-30 µg/kg) and reveal mercury contamination; this is the case along the channel where the distribution of these residues is very uneven due to the dilution observed at the mouth by marine inputs from the Atlantic Ocean. According to the results obtained, the sediments of the two ecosystems are of class 6, extremely polluted sediments (Igeo > 5) showing a significant risk of migration of these residues in the food chain, especially for benthic organisms.},
 year = {2022}
}

Copy | Download

TY  - JOUR
T1  - Sources and Distribution of Mercury (Hg) Residues in Sediments and Physico-Chemical Characterization of Waters in the Cotonou Channel and Lake Nokoué, Benin
AU  - Alassane Youssao Abdou Karim
AU  - Etiennette Dassi
AU  - Finagnon Gabin Laly
AU  - Gildas Fiacre Agossou
AU  - Djafarou Abdoulaye
AU  - Sylvain Zoffoun
AU  - Martin Aina
AU  - Daouda Mama
Y1  - 2022/12/08
PY  - 2022
N1  - https://doi.org/10.11648/j.ajpc.20221104.16
DO  - 10.11648/j.ajpc.20221104.16
T2  - American Journal of Physical Chemistry
JF  - American Journal of Physical Chemistry
JO  - American Journal of Physical Chemistry
SP  - 128
EP  - 138
PB  - Science Publishing Group
SN  - 2327-2449
UR  - https://doi.org/10.11648/j.ajpc.20221104.16
AB  - Water is an essential resource for maintaining aquatic life and the quality of aquatic products. However, sediments are the most important place of accumulation of metal residues and their remobilization in the food chain. The objective of this work is to study the water physicochemical quality and the mercury contamination levels of the sediments in the Channel of Cotonou and Lac Nokoué. Temperature, pH, conductivity, salinity and dissolved oxygen have been measured on-situ in surface and deep water. The surface sediments have been sampled and analyzed in the laboratory using the cold vapor technique (CV-AAS) by the Direct Mercury Analyzer (DMA 80) for mercury analysis. The characterization of the sediments through the granulometric fractions shows that the channel is sandy due to marine inputs while Lake Nokoué is essentially of the silt-sandy type. Mercury concentrations in Lake Nokoué sediments (up to 130.72 µg/kg) greatly exceed geochemical natural loads (20-30 µg/kg) and reveal mercury contamination; this is the case along the channel where the distribution of these residues is very uneven due to the dilution observed at the mouth by marine inputs from the Atlantic Ocean. According to the results obtained, the sediments of the two ecosystems are of class 6, extremely polluted sediments (Igeo > 5) showing a significant risk of migration of these residues in the food chain, especially for benthic organisms.
VL  - 11
IS  - 4
ER  -

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