B S Lartiges

Paul Sabatier University - Toulouse III, Tolosa de Llenguadoc, Midi-Pyrénées, France

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Publications (48)109.61 Total impact

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    ABSTRACT: One of the most important sources of solid waste in the Mediterranean Basin ecosystem originated from the phosphate fertilizer industries, which discharge phosphogypsum (PG) directly into aquatic environments or are stacked on stockpiles. The present study investigates metal release from PG under the influence of variable pH, increasing PG mass content, and complexing organic matter ligands. Major ions from PG leachates, grain size and charge, main functional groups along with metal leachability (Pb, Cd, Cr, Cu, and Zn) were determined using ion chromatography, laser diffraction, zetameter, Fourier transform infrared spectroscopy, and atomic absorption spectroscopy, respectively. The complete dissolution of PG recorded is at 2 g/L. Saturation and supersaturation with respect to PG may occur at concentrations of 3 and 4 g/L, respectively, revealing a clustering phenomenon leading to heavy metal encapsulation within the aggregates. Organic ligands such as citrate may trigger the cationic exchange within the PG suspension leading to ion release. As these factors are considered as specific process involving the release of contaminants from PG during storage under natural conditions, this study could set the foundations for PG remediation in aquatic environment. Organic ligands under controlled pH conditions could be utilized in treating fertilizer industrial wastes by taking into consideration the particularity of the receiving area, thus decreasing metal hazardous impact on natural media.
    Environmental Science and Pollution Research 06/2013; · 2.62 Impact Factor
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    ABSTRACT: The coagulation of sodium montmorillonite by inorganic salts (NaNO3, Ca(NO3)2 and La(NO3)3) was studied by combining classical turbidity measurements with wide-angle-X-ray scattering (WAXS), small-angle-X-ray scattering (SAXS), and transmission X-ray microscopy (TXM). Using size-selected samples, such a combination, associated with an original quantitative treatment of TXM images, provides a true multiscale investigation of the formed structures in a spatial range extending from a few ångstroms to a few micrometers. We then show that, at neutral pH and starting with fully Na-exchanged samples, coagulation proceeds via the formation of stacks of particles with a slight mismatch between layers. These stacks arrange themselves into larger porous anisotropic particles, the porosity of which depends on the valence of the cation used for coagulation experiments. Face-face coagulation is clearly dominant under those conditions, and no evidence for significant face-edge coagulation was found. These structures appear to arrange as larger clusters, the organization of which should control the mechanical properties of the flocs.
    Langmuir 03/2013; · 4.19 Impact Factor
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  • GEOMICROBIOLOGY JOURNAL. 01/2013; 30:600-615.
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    ABSTRACT: The nature of the interaction between iron oxyhydroxide compounds and natural organic matter (NOM) may take various forms and is still a matter of debate. It is an important field to understand, especially for water treatment applications and for the knowledge of iron transport in the environment. The nature of association reached between iron oligomeric species and NOM is here investigated using Mo¨ssbauer spectroscopy and electron energy-loss spectroscopy (EELS) at the Fe-L3 edge. Raw waterNOMtaken from Moselle River (France), natural humic substances extracted from the riverine suspended matter, and a synthesized humic-like substance, are coagulated with iron nitrate according to a jar-test procedure. The results from Mo¨ssbauer spectroscopy indicate that Fe is present in an octahedral coordination environment, which is consistent with prior X-ray absorption spectroscopy reported in the literature. The areas beneath the peaks (Fe L3 edge) and the peak shapes of EELS spectra differ according to the origin of the organic matter, suggesting that various types of Fe populations can be distinguished using the EELS technique. Combining the selectivity of both Mo¨ssbauer spectroscopy for identifying trace, poorly crystalline Fe solids, oxidation state and of EELS for being able to characterize the population of Fe based on L-edge spectra, appears promising for characterizing Fe in systems containing NOM.
    · 2.60 Impact Factor
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    ABSTRACT: Soil amendment by phosphogypsum (PG) application becomes of increasing importance in agriculture. This may lead, however, to soil, plant, and groundwater contamination with trace elements (TEs) inherently present in PG. Monitoring of selected TEs (Pb, Zn, Cu, and Cd) distribution and mobility in a Mediterranean red soil profile has been performed in soil parcels applied with PG over a 16-month period. Concentrations were measured in soil and plant samples collected from various depth intervals at different points in time. TEs sequential extraction was performed on soil and PG samples. Results showed soil profile enrichment peaked 5 months after PG application for Cd, and 12 months for Pb, Zn, and Cu. Rainwater, pH, total organic carbon, and cationic exchange capacity were the main controlling factors in TEs accumulation in soils. Cd was transferred to a soil depth of about 20 cm. Zn exhibited mobility towards deeper layers. Pb and Cu were accumulated in around 20-55-cm-deep layers. PG increased the solubility of the studied TEs; PG-applied soils contained TEs bound to exchangeable and acid-soluble fractions in higher percentages than reference soil. Pb, Zn, and Cu were sorbed into mineral soil phases, while Cd was mainly found in the exchangeable (bio-available) form. The order of TEs decreasing mobility was Zn > Cd > Pb > Cu. Roots and leaves of existed plants, Cichorium intybus L., accumulated high concentrations of Cd (1-2.4 mg/kg), exceeding recommended tolerable levels, and thus signifying potential health threats through contaminated crops. It was therefore recommended that PG should be applied in carefully established, monitored, and controlled quantities to agricultural soils.
    Environmental Monitoring and Assessment 07/2012; 184(7):4397–4412. · 1.59 Impact Factor
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    ABSTRACT: In wastewater treatment plants, optimizing bacterial flocculation and bacterial sludge dewatering requires a detailed understanding of the concomitant biological and physico-chemical processes governing the action of flocculating agent on living cells. Here we investigate the interactions between polyethyleneimine (PEI, 60,000g/mol) and Shewanella oneidensis MR-1 lacking or not the lipopolysaccharide (LPS) O-antigen surface structure. Flocculation tests were performed on bacteria with/without LPS O-antigen after being exposed to 0-100mg/L PEI concentrations. Measurements of electrophoretic mobility and bacterial aggregates size were complemented by transmission electron micrographs and atomic force microscopy images. While low PEI concentrations (<20mg/L) lead to flocculation of both bare and LPS O-antigen-decorated bacterial strains, the lysis of bacterial membranes occurred at larger polymer concentrations for the latter, which highlights the protective role of LPS O-antigen against harmful PEI-mediated membrane alterations. Depending on polymer concentration, two types of bacterial aggregates are identified: one that solely integrates bacterial cells, and another that includes both cells and cell residues resulting from lysis (membrane and/or LPS fragments, and inner cell content materials). The latter is expected to significantly contribute to water entrapping in sludge and thus lower dewatering process efficiency.
    Water Research 04/2012; 46(6):1838-46. · 4.66 Impact Factor
  • Lina Nafeh Kassir, Bruno Lartiges, Naim Ouaini
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    ABSTRACT: Fugitive dust emission, transport and deposition from phosphate fertilizer industries may pose an environmental hazard to the surrounding environment, particularly to soil. This study is to evaluate such hazard by investigating the fate of airborne pollutants, their transfer from atmosphere to soil surface, and their contamination potential. Concentrations of elements were measured in soil samples. Elemental analyses were carried out using ICP-AES and ICP-MS. Analysis of speciation of trace elements, using a sequential extraction method, was performed on the plant's raw material (apatite), product and waste (phosphate fertilizer and phosphogypsum). A model estimating local atmospheric dry deposition was formulated. Statistical analyses were performed on sample data. Measured phosphorus accumulated considerably to the north-east of the plant, mainly due to the prevailing wind and associated dry deposition. Results exhibited considerably above-threshold enrichments in potentially toxic, bio-available trace elements (Cd, Zn) (2.5-6.9, 295-506 mg kg(-1)) and radionuclide (U, 20-98.69 mg kg(-1)) within a major deposition area. Speciation results revealed Zn and Cd occurring predominantly in mobile phases within the pollution source materials. Dry deposition calculation showed extensive input fluxes of Sr, Zn, Cr, U, Ni and Cd. Significant correlation was established between measured trace elements concentrations and their calculated deposition fluxes. Phosphorus species were the principal carriers of trace elements in soils. The phosphate industry poses a serious soil pollution hazard, with deposited contaminants being potentially hazardous to plants and groundwater. This study serves as a basis to assess the phosphate industry's risk impact on soil, while it introduces combined analytical methodologies for such assessment.
    Environmental Technology 04/2012; 33(7-9):873-885. · 1.61 Impact Factor
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    ABSTRACT: Soil amendment by phosphogypsum (PG) application becomes of increasing importance in agriculture. This may lead, however, to soil, plant, and groundwater contamination with trace elements (TEs) inherently present in PG. Monitoring of selected TEs (Pb, Zn, Cu, and Cd) distribution and mobility in a Mediterranean red soil profile has been performed in soil parcels applied with PG over a 16-month period. Concentrations were measured in soil and plant samples collected from various depth intervals at different points in time. TEs sequential extraction was performed on soil and PG samples. Results showed soil profile enrichment peaked 5 months after PG application for Cd, and 12 months for Pb, Zn, and Cu. Rainwater, pH, total organic carbon, and cationic exchange capacity were the main controlling factors in TEs accumulation in soils. Cd was transferred to a soil depth of about 20 cm. Zn exhibited mobility towards deeper layers. Pb and Cu were accumulated in around 20-55-cm-deep layers. PG increased the solubility of the studied TEs; PG-applied soils contained TEs bound to exchangeable and acid-soluble fractions in higher percentages than reference soil. Pb, Zn, and Cu were sorbed into mineral soil phases, while Cd was mainly found in the exchangeable (bio-available) form. The order of TEs decreasing mobility was Zn > Cd > Pb > Cu. Roots and leaves of existed plants, Cichorium intybus L., accumulated high concentrations of Cd (1-2.4 mg/kg), exceeding recommended tolerable levels, and thus signifying potential health threats through contaminated crops. It was therefore recommended that PG should be applied in carefully established, monitored, and controlled quantities to agricultural soils.
    Environmental Monitoring and Assessment 07/2011; 184(7):4397-412. · 1.59 Impact Factor
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    ABSTRACT: The Ganga River is one of the main conveyors of sediments produced by Himalayan erosion. Determining the flux of elements transported through the system is essential to understand the dynamics of the basin. This is hampered by the chemical heterogeneity of sediments observed both in the water column and under variable hydrodynamic conditions. Using Acoustic Doppler Current Profiler (ADCP) acquisitions with sediment depth profile sampling of the Ganga in Bangladesh we build a simple model to derive the annual flux and grain size distributions of the sediments. The model shows that ca. 390 (±30) Mt of sediments are transported on average each year through the Ganga at Haring Bridge (Bangladesh). Modeled average sediment grain size parameters D50 and D84 are 27 (±4) and 123 (±9) mm, respectively. Grain size parameters are used to infer average chemical compositions of the sediments owing to a strong grain size chemical composition relation. The integrated sediment flux is characterized by low Al/Si and Fe/Si ratios that are close to those inferred for the Himalayan crust. This implies that only limited sequestration occurs in the Gangetic floodplain. The stored sediment flux is estimated to c.a. 10% of the initial Himalayan sediment flux by geochemical mass balance. The associated, globally averaged sedimentation rates in the floodplain are found to be ca. 0.08 mm/yr and yield average Himalayan erosion rate of ca. 0.9 mm/yr. This study stresses the need to carefully address the average composition of river sediments before solving large‐scale geochemical budgets.
    Journal of Geophysical Research 01/2011; 116:F04012. · 3.17 Impact Factor
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    ABSTRACT: 1] The Ganga River is one of the main conveyors of sediments produced by Himalayan erosion. Determining the flux of elements transported through the system is essential to understand the dynamics of the basin. This is hampered by the chemical heterogeneity of sediments observed both in the water column and under variable hydrodynamic conditions. Using Acoustic Doppler Current Profiler (ADCP) acquisitions with sediment depth profile sampling of the Ganga in Bangladesh we build a simple model to derive the annual flux and grain size distributions of the sediments. The model shows that ca. 390 (±30) Mt of sediments are transported on average each year through the Ganga at Haring Bridge (Bangladesh). Modeled average sediment grain size parameters D 50 and D 84 are 27 (±4) and 123 (±9) mm, respectively. Grain size parameters are used to infer average chemical compositions of the sediments owing to a strong grain size chemical composition relation. The integrated sediment flux is characterized by low Al/Si and Fe/Si ratios that are close to those inferred for the Himalayan crust. This implies that only limited sequestration occurs in the Gangetic floodplain. The stored sediment flux is estimated to c.a. 10% of the initial Himalayan sediment flux by geochemical mass balance. The associated, globally averaged sedimentation rates in the floodplain are found to be ca. 0.08 mm/yr and yield average Himalayan erosion rate of ca. 0.9 mm/yr. This study stresses the need to carefully address the average composition of river sediments before solving large‐scale geochemical budgets. (2011), A Rouse‐based method to integrate the chemical composition of river sediments: Application to the Ganga basin, J. Geophys. Res., 116, F04012, doi:10.1029/2010JF001947.
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    ABSTRACT: Two divalent cation-based coagulants, magnesium chloride and manganese chloride, were used to treat synthetic textile wastewaters containing the azo-dye pigment Levafix Brilliant Blue EBRA. The jar-tests were performed in the presence or absence of auxiliary dyeing chemicals. They proved that (i) both divalent cation-based coagulants were effective in the treatment of those alkaline effluents, (ii) better performances in terms of color removal, residual turbidity, and settled volume, were achieved with manganese chloride, and (iii) the presence of dyeing auxiliaries significantly increases the required coagulant demand for treating the textile effluent. The dye removal mechanisms were investigated by combining observations of freeze-dried sediments with transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy and selected area electron diffraction, Fourier transform infrared spectroscopy, adsorption experiments, and aggregates size measurements with a laser sizer under cyclic shear conditions. The results show that brucite (Mg(OH)(2)) particles are formed when applying MgCl(2) to the textile wastewaters, whereas a mixture of feitknechite (β-MnOOH) and hausmannite (Mn(3)O(4)) is obtained when using MnCl(2). More poorly crystallized particles are formed in presence of auxiliary dyeing chemicals. The adsorption experiments suggested that the azo-dye pigment adsorbs onto the surface of precipitating phases, whereas the aggregation dynamics indicated that a charge-neutralization mechanism underlies the formation of aggregates. The dye removal is then consistent with a precipitation/adsorption mechanism.
    Journal of hazardous materials 01/2011; 187(1-3):264-73. · 4.14 Impact Factor
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    ABSTRACT: The net effect of organic carbon cycling during continental erosion depends on the balance between rock-derived organic carbon oxidation and ­biospheric organic carbon burial in sediments. Himalayan erosion is dominated by physical transport and each year up to two billion tons of sediments eroded from the Himalaya are delivered to the Bengal Fan through the Ganga–Brahmaputra (G–B) fluvial system. We developed a sampling protocol that allows the heterogeneity of the sediment load to be accounted for. In the channel of large rivers, the total organic carbon content (TOC) is variable and decreases towards depth. TOC is positively correlated to Al/Si ratio, which characterizes the mineral and grain size sorting. In the delta of Bangladesh, sediments from Ganga, Brahmaputra and Lower Meghna have similar organic carbon loading. Coupling Raman Micro-spectroscopy and High Resolution Transmitted Electron Microscopy allows the unambiguous detection and characterization of petrogenic (rock-derived) carbon. Comparison of Himalayan rivers and G–B in Bangladesh indicates that the most graphitised forms are selectively preserved and delivered to the Bay of Bengal. Radiocarbon characterization of sediments along depth profiles yields values for the absolute concentration of petrogenic carbon in rivers sediments. Comparison of Himalayan rocks and G–B sediments in Bangladesh shows that 40% (±10) of the organic carbon contained in the Himalayan rocks is preserved and delivered to the ocean. The evolution of stable isotopic composition (δ13C) from the outflow of the Himalayan range to the delta of Bangladesh shows that during the Gangetic floodplain transit, more than 50% of organic carbon derived from the Himalaya is oxidized and replaced by organic carbon derived from the floodplain. The organic carbon loading of recent Bengal Fan sediments is comparable to that of G–B river sediments. Biomarker abundance and δ13C values show that organic carbon is dominated by terrestrial inputs. The terrestrial organic carbon burial efficiency is thus close to 100%. This strongly contrasts with other large deltaic system on earth, where ∼70% of terrestrial organic carbon is oxidized prior to burial. This extreme burial efficiency is sustained by high erosion rate in Himalaya that generates high sedimentation rate and low oxygen availability in the Bay of Bengal. The balance between biospheric organic carbon burial and petrogenic carbon oxidation indicates a net CO2consumption of 3.2 ± 0.8 × 1011mol/year. Atmospheric CO2consumption through organic carbon cycling during Himalayan erosion is thus an order of magnitude higher than the CO2consumption through silicate weathering in the Himalayan basin (6.4 × 1010mol/year). Efficient burial of organic carbon is a characteristic of high physical erosion typical of active orogenic systems. Enhanced physical erosion and consequent organic carbon burial buffer atmospheric CO2thereby exerting a negative feedback on the long-term climate. KeywordsErosional processes-Fate of soil organic carbon-Carbon burial-Sedimentation-Fluvial transport
    12/2010: pages 163-181;
  • G Frappier, B S Lartiges, S Skali-Lami
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    ABSTRACT: A simple theoretical model is proposed to describe the limiting size of aggregates attained at steady state under given shear conditions. The stable size is assumed to be the result of a dynamic equilibrium between simultaneous aggregate growth and breakup that are represented as first-order processes. The theory establishes that the evolution of steady-state aggregate size versus shear rate is written as the sum of two exponential laws. The validity of the model is verified by direct observation of the coagulation behavior of latex particles in the stagnant plane of a counter-rotating Couette reactor. The influence of latex elementary particle size, initial particle volume fraction, and inner gap spacing of Couette reactor, are investigated. In all cases, the model shows good agreement with the experimental results. Aggregate growth proceeds with a monomodal size distribution that exhibits a scaling behavior. Such monomodal distribution evolves toward broad and even bimodal steady-state distributions at both low and high shear rates, whereas a narrow monomodal pattern is observed at intermediate shear gradients. The aggregate cohesive force F(C) can be calculated from the critical shear rate of dislocation defined by the model. In contrast to the broadly accepted view that larger flocs should be more fragile than smaller aggregates, we find that F(C) scales as D(3/2) where D is the aggregate characteristic diameter. The latter relationship may be derived by assuming linear elasticity of aggregates.
    Langmuir 07/2010; 26(13):10475-88. · 4.19 Impact Factor
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    ABSTRACT: The direct and indirect interaction mechanisms of pyrene with: (i) various molecular weight fractions of a synthetic humic-like substance (SyHA) and (ii) extracts of natural humic acids (NHA) from Moselle River suspended matter were investigated using quenching fluorescence and surface tension measurements. Humic materials were characterized in a previous study. The Stern-Volmer associative constants were determined from the quenching technique. Surface tension measurements revealed an increase in surface activity as a function of concentration for each humic fraction independently of the pyrene presence in solution, even during the formation of humic micelles. The results obtained suggest the possibility of specific intermolecular interactions occurring during pyrene entrapment within humic acids. In addition, we show that molecular weight, aliphatic chains (especially those containing nitrogen groups) and number of acidic groups are determinant characteristics for pollutant entrapment capacity at concentrations below the critical micellar concentration (CMC) of humic substances.
    Chemosphere 06/2010; 80(3):228-34. · 3.14 Impact Factor
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    ABSTRACT: Distribution of Cu, Zn, Pb, Cr, Ni, Mn concentrations and the activity of polonium-210 in the surrounding area of a phosphate fertilizer industry located on the eastern coast of the Mediterranean Sea has been determined. Nineteen sampling sites were distributed around the industrial zone on a surface area of about 100,000 m2. Atomic absorption spectroscopy and Alpha spectroscopy were used to quantify the heavy elements and polonium-210, respectively. Investigation on a particle scale was conducted by TEM and SEM coupled to EDX and X-ray cartography to determine the nature of heavy elements carriers and their distribution. Heavy elements were mainly concentrated inside the particle size fraction < 50 microm. Their levels decreased with distance increasing from the industry. According to the reference soil, enrichment factors were about 10, 15, 32 and 100 times for Zn, Pb, Cu, and Cr, respectively inside the particle size fraction < 50 microm on the closest sites to the industry. The main contaminant sources were transport and storage of row materials and the free release of phosphogypsum waste. Heavy elements were entrapped inside agglomerates of sulfates, phosphates and iron oxihydroxides in a diffused shape. Polonium-210 with an enrichment factor of about 56, showed the same behavior of the spatial distribution of the trace elements.
    Journal of Environmental Sciences 01/2010; 22(9):1387-97. · 1.77 Impact Factor
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    ABSTRACT: A preliminary insight into metal cycling within the urban sewer was obtained by determining both the heavy metal concentrations (Cu, Zn, Pb, Cd, Ni, Cr) in sewage and sediments, and the nature of metal-bearing particles using TEM-EDX, SEM-EDX and XRD. Particles collected from tap water, sump-pit deposits, and washbasin siphons, were also examined to trace back the origin of some mineral species. The results show that the total levels in Cu, Pb, Zn, Ni, and Cr in sewage are similar to that reported in the literature, thus suggesting that a time-averaged heavy metal fingerprint of domestic sewage can be defined for most developed cities at the urban catchment scale. Household activities represent the main source of Zn and Pb, the water supply system is a significant source of Cu, and in our case, groundwater infiltration in the sewer system provides a supplementary source of Ni and Cd. Concentrations in heavy metals were much higher in sewer sediments than in sewage suspended solids, the enrichment being due to the preferential settling of metal-bearing particles of high density and/or the precipitation of neoformed mineral phases. TEM and SEM-EDX analyses indicated that suspended solids, biofilms, and sewer sediments contained similar heavy metal-bearing particles including alloys and metal fragments, oxidized metals and sulfides. Copper fragments, metal carbonates (Cu, Zn, Pb), and oxidized soldering materials are released from the erosion of domestic plumbing, whereas the precipitation of sulfides and the sulfurization of metal phases occur primarily within the household connections to the sewer trunk. Close examination of sulfide phases also revealed in most cases a complex growth history recorded in the texture of particles, which likely reflects changes in physicochemical conditions associated with successive resuspension and settling of particles within the sewer system.
    Science of The Total Environment 10/2009; 407(23):6052-62. · 3.26 Impact Factor
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    ABSTRACT: This paper investigates the potential of stable isotopes of both water (deltaD and deltaOH(2)O18) and dissolved sulfate (delta(34)S and deltaOSO(4)18) for determining the origin and the amount of clear waters entering an urban sewer. The dynamics of various hydrological processes that commonly occur within the sewer system such as groundwater infiltration, rainwater percolation, or stormwater release from retention basins, can be readily described using water isotope ratios. In particular, stable water isotopes indicate that the relative volumes of infiltrated groundwater and sewage remain approximately constant and independent of wastewater flow rate during the day, thus demonstrating that the usual quantification of parasitic discharge from minimal nocturnal flow measurements can lead to completely erroneous results. The isotopic signature of dissolved sulfate can also provide valuable information about the nature of water inputs to the sewage flow, but could not be used in our case to quantify the infiltrating water. Indeed, even though the microbial activity had a limited effect on the isotopic composition of dissolved sulfate at the sampling sites investigated, the dissolved sulfate concentration in sewage was regulated by the formation of barite and calcium-phosphate mineral species. Sulfate originating from urine was also detected as a source using the oxygen isotopic composition of sulfate, which suggests that deltaOSO(4)18 might find use as a urine tracer.
    Water Research 09/2009; 44(1):256-66. · 4.66 Impact Factor
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    Water Research. 08/2009; 43(14):3633.

Publication Stats

316 Citations
109.61 Total Impact Points

Institutions

  • 2012–2013
    • Paul Sabatier University - Toulouse III
      Tolosa de Llenguadoc, Midi-Pyrénées, France
  • 2011–2012
    • Holy Spirit University of Kaslik
      • Faculty of Sciences
      Beirut, Mohafazat Beyrouth, Lebanon
  • 2010
    • Ecole des Métiers de l'Environnement (EME)
      Bruz, Brittany, France
  • 2007
    • French National Centre for Scientific Research
      • Laboratoire environnement et minéralurgie (LEM)
      Lutetia Parisorum, Île-de-France, France
  • 2003
    • Ecole Nationale Supérieure Des Industries Chimiques (ENSIC)
      Nancy, Lorraine, France