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

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

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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

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

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

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

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

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

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

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

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

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