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. 2022 Dec 9;195(1):185.
doi: 10.1007/s10661-022-10635-2.

Assessment of the global toxicity of marine sediments from the Dakar peninsula (Senegal, West Africa)

Amidou Sonko  1   2   3   4 , Dalyal Copin  5 , Patrice Brehmer  6 , Cheikh Diop  7 , Guillaume Constantin De Magny  8   9 , Mamadou Fall  7 , Yoba Kande  10   6   11 , Patricia Moulin  12 , Naby Souleymane Faye  10   6 , Saliou Faye  10 , Isabelle Linossier  5 , Gaël Le Pennec  5
Affiliations

Assessment of the global toxicity of marine sediments from the Dakar peninsula (Senegal, West Africa)

Amidou Sonko et al. Environ Monit Assess. .

Abstract

Marine pollution in West Africa is major threat particularly around coastal megacities. We assess the chemical and ecotoxicological quality of the marine sediments in various submerged sampling sites of Dakar. Analysis revealed that sediments were slightly basic in which fine and coarse sands predominated. High percentages of total organic carbon were found sometime above 6%. Higher levels of heavy metal were reported than in previous studies. Chromium and nickel were above the Probable Effect Concentration. Low trophic level appeared not affected by the overall toxicity, while medium trophic level was more affected. Indeed, the vast majority (91%) of sites studied revealed a net percentage of Magallana gigas embryolarval developmental abnormality over 20%. The assessment of the global toxicity of marine sediments from the Dakar sites Studied (n = 11) seemed, almost, as a whole, to be in a poor ecotoxicological state calling to take measures to improve the sanitary condition of this marine feature.

Keywords: Artemia salina; Heavy metal elements; Magallana gigas; Marine sediments; Phaeodactylum tricornutum; TOC.

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