Assessment of trace metals contamination level, bioavailability and toxicity in sediments from Dakar coast and Saint Louis estuary in Senegal, West Africa

Diop, Cheikh; Dewaele, Dorothée; Cazier, Fabrice; Diouf, A.; Ouddane, Baghdad

doi:10.1016/j.chemosphere.2014.12.041

Cited by 112 publications

(55 citation statements)

References 37 publications

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“…For most elements (except for As), the concentrations were highest at Soumb edioune (particularly during the wet season) and lowest at Joal. In a recent study of element contamination levels and toxicity of sediments from coastal areas of Senegal (Diop et al, 2015), significant pollution by Cd, Cr, Cu and Pb derived from anthropogenic sources was reported. From an ecotoxicological point of view, the concentration of these elements was above the effects range low threshold limit of the sediment quality guidelines for adverse biological effects (Diop et al, 2015).…”

Section: Seasonal and Spatial Concentration Patternsmentioning

confidence: 98%

“…Such phenomena may explain the higher concentration of Cd found in sardinella which feed directly on plankton. Metal bioaccumulation factors (BAFs) and bioconcentration factors (BCFs) were calculated respectively from the previously published data on element concentration in seawater (Diop et al, 2014) and in sediments (Diop et al, 2015). For both species, the highest BAF values were obtained for Cd and Cu and the highest BCF values were obtained for Cd, Cu and Zn.…”

Section: Soumb Ediounementioning

confidence: 99%

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Spatial and seasonal variations of trace elements concentrations in liver and muscle of round Sardinelle (Sardinella aurita) and Senegalese sole (Solea senegalensis) along the Senegalese coast

et al. 2016

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Section: Seasonal and Spatial Concentration Patternsmentioning

confidence: 98%

Section: Soumb Ediounementioning

confidence: 99%

Spatial and seasonal variations of trace elements concentrations in liver and muscle of round Sardinelle (Sardinella aurita) and Senegalese sole (Solea senegalensis) along the Senegalese coast

et al. 2016

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“…The main impact on the bioaccumulated metals in the different tissues was determined to be tissue specifically affected by both aqueous and sedimentary metal contents. The correlation-based study gives an indication about the potential relationships between metals: common source, related dependence and similar behaviors (Diop et al, 2015). The aqueous metals showed positive correlation with Cu and negative correlation with Pb, Fe & Mn in almost all studied tissues which suggested that these metals had mutual sources, related dependence, uniform distribution and same performance in the aquatic environment.…”

Section: Correlation Between Metalsmentioning

confidence: 99%

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Abdel-Khalek¹,

Elhadad²,

Mamdouh³

et al. 2016

Turk. J. Fish. Aquat. Sci.

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This work aimed to assess the impact of Sabal drains (northern part of El-Minufiyah governorate, Egypt) on the metals load of river Nile. Four sites were selected to monitor the partitioning of metals in the aquatic components: reference site (site1); 20Km before Sabal drainage (site2); Sabal site (site3) and 20Km after Sabal drainage (site4). The maximum means of aqueous metals were observed at site3 in the following order (mg/l): Fe (0.76) >Mn (0.325) >Zn(0.07) >Pb (0.064) >Cu (0.041) >Cd (0.0035), while the trend is slightly different in sediments (mg/kg): Fe (527.9) >Mn (102.7) >Zn (17.65) >Cu (11.4) >Pb (1.26)>Cd (0.07). Tissue-specific patterns of metal accumulation in Oreochromis niloticus were observed. As indicated by the calculated metal pollution index and bioaccumulation factor, the tissues of liver, kidneys and gills were observed to be strong bioaccumulators compared to muscular tissues. Regarding the correlation study in site3, the bioaccumulated metals in most tissues showed homogenous-correlation with aqueous metals (r>0.5) and diverse-correlations with respect to sedimentary metals. The calculated hazard index (HI) indicated that each metal had low HI but, the cumulative impacts of all metals represented a real threat to fish consumers especially at site3. Metals elevation was highly correlated with Sabal discharges and regulations for water and fish consumption have to be applied.

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“…The recovery rate of copper speciation analysis was in the range of 87e130%, which was consistent with previous study (Wang et al, 2014a,b). According to previous studies (Diop et al, 2015;Zhang et al, 2016a), the first three speciations were regarded as bioavailable. The heavy metal concentrations including Cu, Zn, As, Cr, Pb, Cd, Mn and Ni were determined using inductively coupled plasma-mass spectrometry (ICP-MS) or optical emission spectrometry (ICP-OES) according to the concentrations of different heavy metals.…”

Section: Heavy Metal Analysismentioning

confidence: 99%

Sludge bio-drying: Effective to reduce both antibiotic resistance genes and mobile genetic elements

et al. 2016

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a b s t r a c tSewage sludge is considered as one of major contributors to the increased environmental burden of ARGs. Sludge bio-drying was increasingly adopted due to its faster sludge reduction compared with composting. The fate of ARGs during full-scale sludge bio-drying was investigated to determine whether it could effectively reduce ARGs, and the contributions of bacterial community, horizontal gene transfer (HGT) through mobile genetic elements (MGEs) and co-selection from heavy metals to ARGs profiles were discussed in detail. Two piles with different aeration strategies (Pile I, the improved and Pile II, the control) were operated to elucidate effects of aeration strategy on ARGs profiles. Results showed that sludge bio-drying could effectively reduce both most of targeted ARGs (0.4e3.1 logs) and MGEs (0.8e3.3 logs) by the improved aeration strategy, which also enhanced both the sludge bio-drying performance and ARGs reduction. The enrichment of ARGs including ermF, tetX and sulII could be well explained by the evolution of bioavailable heavy metals, not HGT through MGEs, and their potential host bacteria mainly existed in Bacteroidetes. Although changes of bacterial community contributed the most to ARGs profiles, HGT through MGEs should be paid more attention especially in the thermophilic stage of sludge bio-drying.

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Assessment of trace metals contamination level, bioavailability and toxicity in sediments from Dakar coast and Saint Louis estuary in Senegal, West Africa

Cited by 112 publications

References 37 publications

Spatial and seasonal variations of trace elements concentrations in liver and muscle of round Sardinelle (Sardinella aurita) and Senegalese sole (Solea senegalensis) along the Senegalese coast

Spatial and seasonal variations of trace elements concentrations in liver and muscle of round Sardinelle (Sardinella aurita) and Senegalese sole (Solea senegalensis) along the Senegalese coast

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Sludge bio-drying: Effective to reduce both antibiotic resistance genes and mobile genetic elements

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