Organic carbon, and major and trace element dynamic and fate in a large river subjected to poorly-regulated urban and industrial pressures (Sebou River, Morocco)

Hayzoun, H.; Garnier, Cédric; Durrieu, Guy; Lenoble, Véronique; Poupon, Christophe Le; Angeletti, Bernard; Ouammou, Abdelkrim; Mounier, Stéphane

doi:10.1016/j.scitotenv.2014.09.014

Cited by 37 publications

(31 citation statements)

References 49 publications

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“…Tonkin et al 2002;Wällstedt et al 2010;Nystrand et al 2012) and non-acidic conditions (e.g. Tonkin et al 2002;SanchesEspana et al 2006;Balistrieri et al 2007;Hayzoun et al 2015). The present results further support the use of equilibrium models to predict the behaviours of Fe and Pb under a relatively wide range of geochemical conditions, including the high-pH conditions of our modelled river system.…”

Section: Metals Governed By Equilibrium Processessupporting

confidence: 86%

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

et al. 2016

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The speciation of metals in aqueous systems is central to understanding their mobility, bioavailability, toxicity and fate. Although several geochemical speciation models exist for metals, the equilibrium conditions assumed by many of them may not prevail in field-scale hydrological systems with flowing water. Furthermore, the dominant processes and/or process rates in non-acidic systems might differ from well-studied acidic systems. We here aim to increase knowledge on geochemical processes controlling speciation and transport of metals under nonacidic river conditions. Specifically, we evaluate the predictive capacity of a speciation model to novel measurements of multiple metals and their partitioning, under highpH conditions in mining zones within the Lake Baikal basin. The mining zones are potential hotspots for increasing metal loads to downstream river systems. Metals released from such upstream regions may be transported all the way to Lake Baikal, where increasing metal contamination of sediments and biota has been reported. Our results show clear agreement between speciation predictions and field measurements of Fe, V, Pb and Zn, suggesting that the partitioning of these metals mainly was governed by equilibrium geochemistry under the studied conditions. Systematic over-predictions of dissolved Cr, Cu and Mo by the model were observed, which might be corrected by improving the adsorption database for hydroxyapatite because that mineral likely controls the solubility of these metals. Additionally, metal complexation by dissolved organic matter is a key parameter that needs continued monitoring in the Lake Baikal basin because dependable predictions could not be made without considering its variability. Finally, our investigation indicates that further model development is needed for accurate As speciation predictions under non-acidic conditions, which is crucial for improved health risk assessments on this contaminant.

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Section: Metals Governed By Equilibrium Processessupporting

confidence: 86%

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

et al. 2016

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“…Bader et al, 2015;El Baghdadi et al, 2015;Hayzoun et al, 2015;Nadem et al, 2015;Mourhir et al, 2014;Barakat et al, 2013;El Morhit et al, 2013;Barakat et al, 2012;Iavazzo et al, 2012;Oufline et al, 2012;Derwich et al, 2011;Naoura & Benaabidate, 2011;Alla et al, 2006;Taoufik & Dafir, 2005;Koukal et al, 2004). In Oum Er Bia basin, the vulnerability of water resources pollution is due to strong agricultural and industrial activity including oil mills, phosphate extraction, livestock farming, and sugar beet processing.…”

Section: Introductionmentioning

confidence: 99%

Assessment of spatial and seasonal water quality variation of Oum Er Rbia River (Morocco) using multivariate statistical techniques

Barakat

Baghdadi

Rais

et al. 2016

International Soil and Water Conservation Research

302

141

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A B S T R A C TThe aim of this study is to assess the spatial and temporal water quality variation and to determine the main contamination sources in the Oum Er Rbia River and its main tributary, El Abid River. The water quality data were collected during 2000-2012 from fourteen sampling stations distributed along the river. The water quality indicators used were TEMP, pH, EC, turbidity, TSS, DO, NH 4 + , NH 3 -, TP, BOD 5 , COD and F. coli. The water quality data was analyzed using multivariate statistical methods including Pearson's correlation, PCA, and CA. The results showed that in some stations the water quality parameters were over Moroccan water standards. PCA applied to compare the compositional patterns among the analyzed water samples, identified and four factors accounting for almost 63% of the total variation in the data. This suggests that the variations in water compounds' concentration are mainly related to point source contamination (domestic and industrial wastewater), non-point source contamination (agriculture activities), as well as natural processes (weathering of soil and rock). CA showed relatively spatial and seasonal changes in surface water quality, which are usually indicators of contamination with rainfalls or other sources. Overall, this study showed that the water was potentially hazardous to health of the consumers and highlighted the need to treat industrial and municipal wastewater and to encourage sustainable agricultural practices to prevent adverse health effects. We therefore suggest wise management of anthropogenic activities in the catchment of Oum Er Bia River and their tributaries.

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“…Hexavalent Cr is considered of most concern due to its ecotoxicity and proven carcinogenicity in humans, while trivalent Cr is usually regarded as relatively harmless (WHO, 2009;2013). Hexavalent Cr also has high environmental mobility, while Cr(III) tends to bind to suspended particulate matter and colloids and eventually accumulates in bed sediments (de Sousa et al, 2016;Dominik et al, 2007;Gunkel-Grillon et al, 2014;Hayzoun et al, 2015). Remobilization of Cr(III) from bed sediments is however possible following re-oxidation to Cr(VI) (Gorny et al, 2016;Gunkel-Grillon et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Leather tanning uses large quantities of Cr(III), generally as the basic chromium sulphate Cr 2 (OH) 2 (SO 4 ) 2 . Chromium inputs from tanneries can markedly affect Cr concentrations and fluxes in aquatic environments at local scales (Alves and Rietzler, 2015;Dominik et al, 2007;Hayzoun et al, 2015;Sanyal et al, 2015) and the toxicological impact of tannery wastewaters containing numerous potentially harmful compounds was recently reviewed by Saxena et al (2017). However, understanding the contribution of Cr(III) to the overall biological response is far from straightforward because tannery effluents contain several toxicologically active substances.…”

Section: Introductionmentioning

confidence: 99%

Chromium bioavailability in aquatic systems impacted by tannery wastewaters. Part 1: Understanding chromium accumulation by indigenous chironomids

Vignati

Ferrari

Roulier

et al. 2019

Science of The Total Environment

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The tanning industry uses large quantities of Cr whose contribution to the contaminant burden of aquatic organisms is not yet fully understood. The present study investigated Cr bioaccumulation by indigenous chironomids in a freshwater ecosystem impacted by tannery effluents. Total Cr content in sediments and in chironomids was determined on several occasions. Chromium distribution among sediments and pore waters, and Cr speciation in overlying and pore waters were studied in detail to understand possible factors controlling Cr bioavailability to chironomids. Total chromium concentration ranged from 69 to over 3000 µg g-1 dry weight in sediments and from negligible to over 300 µg-1 dry weight in chironomids (values corrected for sediment gut content). Filterable (<0.45 µm) Cr concentration in overlying waters and pore waters from the surface sediment layers (upper 2 cm) ranged from 3 to 120 µg L-1 , with Cr(VI) representing 0.5-28% of the total filterable Cr. Chromium profiles in pore waters as determined by diffusive equilibration in thin films (DET) and diffusive gradient in thin films (DGT) were comparable. DGT-labile Cr accounted for less than 2% of the total Cr measured by DET. Although Cr concentrations in sedimentary and aqueous matrices were not directly proportional to Cr levels measured in chironomids, the available findings suggested that Cr inputs from tanneries were bioavailable to resident chironomids. These observations are of particular importance considering that Cr(III), putatively of limited bioavailability and ecotoxicological concern, is the predominant redox form of Cr in bed sediments impacted by tannery discharges. The companion paper provides further insight into Cr bioavailability and effects in tannery impacted ecosystems using a combination of in situ and laboratory approaches.

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Organic carbon, and major and trace element dynamic and fate in a large river subjected to poorly-regulated urban and industrial pressures (Sebou River, Morocco)

Cited by 37 publications

References 49 publications

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

Assessment of spatial and seasonal water quality variation of Oum Er Rbia River (Morocco) using multivariate statistical techniques

Chromium bioavailability in aquatic systems impacted by tannery wastewaters. Part 1: Understanding chromium accumulation by indigenous chironomids

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