In coastal waters, trace metals continues to be among global threats due to several harmful effects on living organisms. The present study was conducted along the Abobo-Doumé Fish Market (ADFM) to assess metal contamination due to the lack of data despite the influences of several socio-economic activities. Waters (both surface and bottom layers) and surface sediments samples were collected using respectively a Niskin bottle and a Van Venn Steel, at five stations in April 2006.Trace metals concentrations were determined using the ICP-MS Instrument after proper treatment of each sample. Then, the obtained concentrations were used to calculate several pollution indexes such as Contamination Index (CI), Contamination factor (CF), Pollution Load Index (PLI), Enrichment factor (EF) and Muller’s Index of Geo-accumulation (Igeo) to evaluate the contamination of the selected trace metals in waters and sediments. For water samples, apart from Iron that was not detected in any sample, trace metals were found in respective ranges (in µg/L) of ND-0.2 (As), 0.2-2.0 (Cd), 2.0-20.0 (Hg), ND-1.0 (Mn) and 1.0-390.0 (Pb). According the World Health Organization guidelines values, waters were safe for As, Cd, Fe, and Mn. For Hg, apart from waters closed to the ADFM that exhibited a value of 20.0 µg/L, higher than the reference value of 6.0 µg/L, waters were safe elsewhere. Waters were found contaminated with Pb, particularly in bottom layers, with levels nine to thirty times higher than the reference value of 10.0 µg/L. For sediments, the respective ranges (in mg/kg dry weight) were observed: 2.10-4-1668.48 (As), 2.10-4-7.50 (Cd), 1.95-4554.90 (Fe), 10-4-2.070 (Mn) and 0.001-253.50 (Pb). Highest concentrations of As, Cd and Pb were observed in sediments from several sampling stations, indicating a contamination status of these sediments as confirmed by the calculated pollution indexes. In conclusion, waters along the Abobo-Doumé Fish Market were contaminated in Pb, while sediments exhibited highest concentrations in As, Cd and Pb. This area of the Ebrié Lagoon need attention to the exceeded concentrations of toxic elements (As, Cd and Pb) observed. The present study has provided useful data for future environmental assessment along the Abobo-Doumé Fish Market.
In aquatic ecosystems, trace metals (TMs) are widely studied due to their harmful effects on living organisms and humans. The aim of the present study was to use different pollution indices to characterize the sediments contamination with six TMs (As, Cd, Fe, Hg, Mn and Pb). Sediments samples were collected in April 2006 with a Van Veen grab at five stations located in the Ebrie Lagoon (Côte d’Ivoire). TMs concentrations were determined using an ICP-MS Instrument for the calculation of the contamination index (CI), contamination factor (CF), pollution load index (PLI), enrichment factor (EF) and Muller’s index of geoaccumulation (Igeo). The CI revealed the sediments contamination in As, Cd and Pb, while CF highlighted their contamination in Hg, As, Fe and Cd. Regarding the PLI, the sediments were uncontaminated with TMs. The EF showed the sediments enrichment with Hg, Pb and As, while the Igeo revealed their pollution with As, Fe, Pb and Cd. In conclusion, the PLI is a useful tool for different locations characterization, while the others (CI, CF, EF, and Igeo) allow individual characterization regarding each TM. Due to high contents in As, Cd and Pb, the studied area need a particular attention.
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