Pollution métallique et organique des eaux et des sédiments d’un cours d’eau marocain par les rejets liquides urbains

Khamar, Mohamed; Bouya, Driss; Ronneau, Claude

doi:10.2166/wqrj.2000.009

Cited by 23 publications

(8 citation statements)

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“…High U concentration in the Rhone basin (PDS and GC sites) are due to the presence of U-enriched granites and U-mineralised zones (Dominik et al, 1992), while the elevated U level at site 3PO probably derives from the massive use of fertilisers in the Lambro basin (see IRSA, 1997). Very high levels of Cr are encountered in the Dunajec and Sebou systems which are impacted by tannery wastes (Szalinska and Kurbiel, 2000;Khamar et al, 2000) and, to a much lesser extent, at sites 3PO and NA which are affected by polymetallic contamination. Total filterable Mn seems to be controlled by redox conditions since highest values are observed at locations known to receive substantial inputs of organic matter and characterised by a low percentage oxygen saturation (4D, 3PO, 2MA, 3MA, 4MA, and, possibly, ST).…”

Section: Resultsmentioning

confidence: 99%

“…Contamination by municipal sewage is minimal at 1PO, intermediate at 2PO and maximum at 3PO. Finally, the Oued Sebou-Fès system is highly polluted with tannery (Cr contamination) and organic wastes (olive oil production, urban sewage) (Khamar et al, 2000). Site 1MA is located upstream of polluting inputs and represents a reference condition for the basin.…”

Section: Sampling Sitesmentioning

confidence: 99%

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The role of coarse colloids as a carrier phase for trace metals in riverine systems

Vignati

Dominik

2003

Aquat. Sci.

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In order to better understand the role of colloids in aquatic systems, better fractionation methods of environmental samples into particulate, colloidal, and truly dissolved phase are needed. An adequate fractionation procedure involves 1) prefiltration to remove large (i.e., settling) particles and 2) ultrafiltration to separate colloids from the truly dissolved compounds. Prefiltration is most commonly accomplished using filters with 0.45 or 0.22 μm pore size, which results in the inclusion of coarse colloids (size by definition up to about 1 μm) into the particulate phase. To evaluate the possible drawbacks of such operational procedures, the trace metal fraction associated with coarse colloids (size range 0.45-1.2 μm) was quantified in a number of rivers having different biogeochemical characteristics and degree of anthropogenic impact. Al, Pb, and Ti showed a strong association with coarse colloids (often over 50% of the total filterable metal at 1.2 μm) in all rivers. Other elements (Co, Cr, Cu, Fe, Mn, Ni, U, V, and Zn) had a more variable behaviour, possibly linked to differences in conductivity, oxygen saturation, and nature of colloids (mineral, organic, or mixed) among rivers. No overall statistically significant relationships could be found between the percentage metal fractions associated with coarse colloids and master environmental variables. However, when systems where classified according to the nature of colloids, Al and Pb showed statistically significant relationships with suspended particulate matter. Significant relationships were also observed between the metal pairs Mn/Co, Mn/Cu, Mn/V, Fe/Co, and Fe/Ni. The association of trace metals with coarse colloids has important implications as to their transport, fate and bioavailability in natural systems. These findings suggest that, at least in some cases, the use of the classical size limit of 0.45 μm as a boundary between the particulate and dissolved phases should be partially reconsidered and redefined

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Section: Resultsmentioning

confidence: 99%

Section: Sampling Sitesmentioning

confidence: 99%

The role of coarse colloids as a carrier phase for trace metals in riverine systems

Vignati

Dominik

2003

Aquat. Sci.

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“…La variation saisonnière reste discrète et traduit une légère tendance à la dégradation des eaux de la Haute Moulouya pendant les basses eaux de la période estivale. Riche en milieux aquatiques, le Maroc est parmi les pays d'Afrique les plus menacés par le fléau de la pollution de ses eaux (Khamar et al, 2000 ;Mutin, 2000 ;Azzaoui et al, 2002 ;Taybi et al, 2016).…”

Section: Résuméunclassified

Utilisation Des Indices De Qualité Et De Pollution Organique Dans L’évaluation De La Qualité PhysicoChimique Des Eaux Superficielles Des Oueds Moulouya et Ansegmir (Haute Moulouya, NE Du Maroc)

Bekri

Hmaidi

Jaddi

et al. 2020

ESJ

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Surface water is subject to strong anthropogenic pressures caused by the development and extension of agricultural activities and also by industrial and domestic activities. Pollution is a serious problem for the environment due to discharges dumped into rivers and excessive use of agricultural fertilizers and discharges from urban and industrial sources. The objective of this study is to assess the quality and state of organic pollution in surface water in Upper Moulouya based on the water quality index (WQI) and the organic pollution index (IPO) during three sampling campaigns carried out between March and August of 2014. Ten stations were studied along the Moulouya and Ansegmir wadis up to the Hassan II dam. The results are visualized through the use of GIS through the production of thematic maps. They revealed that the majority of stations indicate excellent water quality and show no organic pollution with the exception of Boumia (M5) and Zaida (M6) stations which respectively have poor quality water and low pollution. at Boumia and non-drinking water

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“…These values are lower than those recorded in sewage irrigated bean (Cu 1.775 g / kg, Zn 1.4 g / kg [12] and in the tomato stem 17.7 g / kg of copper.17 However, the concentration Of Zn is less than that of lettuce (194 mg / kg). [19] However, the high concentrations of these two metals (Cu and Zn) in addition to iron are due to the metabolic requirements of the plant. These elements are part of the composition of certain enzymes or serve as cofactors for the development of the plant [28].…”

Section: Cmss-2017mentioning

confidence: 99%

Bioaccumulation of heavy metals by the flora and benthic macrofauna of the Bouregreg estuary wetland

2018

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Estuarine systems account for a high proportion of wetlands in Morocco due to the development of the river system. These estuarine and coastal Moroccan environments are as rich in fauna and flora as their European equivalents and present much originality. However, these coastal areas are generally highly urbanized and industrialized, and therefore subject to domestic and industrial discharges. The Bouregreg Estuary represents a good example of this situation, in view of this pollution (organic, chemical and biological) and the absence of fresh water supply upstream of the estuary after the dam was built, is increasingly unable of restoring the equilibrium of this ecosystem. This tide can instead ensure the polluting discharge downstream or upstream. Metallic contamination affects the different compartments of the estuarine ecosystem (sediment, water) and benthic species (fauna and flora). The objective of this study is to assess the accumulation and bioaccumulation of five heavy metals (Cu, Fe, Zn, Cr and Pb) at the sediment level of two dominant plant species (Artiplex portulacoides and Sarcocornia fructicosa) and three species of benthic macrofauna (Scrobicularia plana, Venerupis decussata and Hediste diversicolor) from the wetland of this estuary. This work will enable us to clearly understand the nutritional relationships between plant, animal, water and sediment species. The results of the analysis revealed that bioaccumulation varies from one species to another and from one metal to another. Thus, the levels of Lead and Chromium at Sarcocornia fructicosa are higher than those found at Artiplex portulacoides. Nevertheless, the latter accumulates better the other metals: Cu, Zn and Fe. While, the macrofauna shows a fairly large variation depending on the life style and sensitivity of species. Thus, Hediste diversicolor showed high levels of the various metals analyzed compared to Scrobicularia plana and Venerupis decussata.

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Pollution métallique et organique des eaux et des sédiments d’un cours d’eau marocain par les rejets liquides urbains

Cited by 23 publications

References 0 publications

The role of coarse colloids as a carrier phase for trace metals in riverine systems

The role of coarse colloids as a carrier phase for trace metals in riverine systems

Utilisation Des Indices De Qualité Et De Pollution Organique Dans L’évaluation De La Qualité PhysicoChimique Des Eaux Superficielles Des Oueds Moulouya et Ansegmir (Haute Moulouya, NE Du Maroc)

Bioaccumulation of heavy metals by the flora and benthic macrofauna of the Bouregreg estuary wetland

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