Chemical distribution of trivalent iron in riverine material from a tropical ecosystem: a quantitative EPR study

Olivié-Lauquet, Gwenaelle; Allard, Thierry; Benedetti, Marc F.; Müller, Jean‐Pierre

doi:10.1016/s0043-1354(98)00479-5

Cited by 55 publications

(49 citation statements)

References 32 publications

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“…This fraction controlled the distribution of Ca, Mg and Fe. In Africa (Cameroon), the iron speciation in small tropical watersheds was determined by Olivié-Lauquet et al (1999) and supports the iron distribution observed by Eyrolle et al (1996). Recently, Allard et al (2002) characterized the suspended solids of the Amazon basin and found that iron distribution was changing with the type of river (i.e.…”

Section: Introductionsupporting

confidence: 62%

“…The strong affinity of Al and Fe for organic ligands is well known. Olivié-Lauquet et al (1999) showed that for black rivers of a small watershed in Cameroon, more than 50% of the Fe was associated with organic colloids via strong inner-sphere type complexes. The Fe distribution of the study herein also indicates that organic colloids have a high affinity for metal ions (Fe and Al) as previously reported (Lakshman et al, 1993;Town and Powell, 1993).…”

Section: Major and Trace Element Speciationmentioning

confidence: 99%

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Carbon and metal concentrations, size distributions and fluxes in major rivers of the Amazon basin

Benedetti

Mounier

Filizola

et al. 2003

Hydrological Processes

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Section: Introductionsupporting

confidence: 62%

Section: Major and Trace Element Speciationmentioning

confidence: 99%

Carbon and metal concentrations, size distributions and fluxes in major rivers of the Amazon basin

Benedetti

Mounier

Filizola

et al. 2003

Hydrological Processes

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“…Ultrafiltration and dialysis are two major techniques implemented for this purpose and, in particular, for quantifying colloid size distributions. While many studies have been devoted to colloid characterization in surficial aquatic environments such as rivers, lakes and seawater (see Buffle et al, 1992;Tanizaki et al, 1992;Benoit et al, 1994;Buesseler et al, 1996;Guo and Santschi, 1996;Wen et al, 1996;Lead et al, 1997;Pham and Garnier, 1998;Eyrolle and Benaim, 1999;Dupre´et al, 1999;Ross and Sherrell, 1999;Olivie´-Lauquet et al, 1999Ingri et al, 2000;Hoffmann et al, 2000;Sigg et al, 2000;Vesely et al, 2001;Lyve´n et al, 2003), soil solutions have received much less attention (Berggren, 1989;Menzies et al, 1991;Gasser et al, 1994;Gooddy et al, 1995;Huber and Denaix, 2000;Riise et al, 2000;.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, temperate (Shotyk, 1988(Shotyk, , 1997 and tropical (Weiss et al, 2002) peatlands have been extensively studied from the viewpoint of elements concentration in soil profile, biological accumulation mechanisms and solution chemistry of major elements (Gorham et al, 1985;Shotyk, 1993Shotyk, , 1997. In such organic-rich environments, aluminum and iron are always associated to humic and fulvic acids (Beck et al, 1974;Tipping et al, 1995Tipping et al, , 2002Olivie´-Lauquet et al, 1999Scha¨fer et al, 2003aScha¨fer et al, , 2003b. As a result, most of chemical elements released by weathering, notably trace metals, are transported as mixed Fe-Al-organic colloids.…”

Section: Introductionmentioning

confidence: 99%

Fe–Al–organic Colloids Control of Trace Elements in Peat Soil Solutions: Results of Ultrafiltration and Dialysis

Pokrovsky¹,

Dupré²,

Schott³

2005

Aquat Geochem

133

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Size fractionation of $40 major and trace elements (TE) in peat soil solutions from the Tverskaya region (Russia) has been studied using frontal filtration and ultrafiltration through a progressively decreasing pore size (5, 2.5, 0.22 lm, 100, 10, 5, and 1 kD) and in situ dialysis through 6-8 and 1 kD membranes with subsequent analysis by ICP-MS. In (ultra) filter-passed permeates and dialysates of soil solutions, Fe, Al, and organic carbon (OC) are well correlated, indicating the presence of mixed organo-mineral colloids. All major anions and silica are present in ''dissolved'' forms passed through 1 kD membrane. According to their behavior during filtration and dialysis and association with mineral or organic components, three groups of elements can be distinguished: (i) species that are weakly affected by size separation operations and largely (>50-80%) present in the form of dissolved inorganic species (Ca, Mg, Li, Na, K, Sr, Ba, Rb, Cs, As, Mn) with some proportion of small (1-10 kD) organic complexes (Ca, Mg, Sr, Ba), (ii) biologically essential elements (Co, Ni, Zn, Cu, Cd) mainly present in the fraction smaller than 1 kD and known to form strong organic complexes with fulvic acids, and, (iii) elements strongly associated with aluminum, iron and OC in all ultrafiltrates and dialysates with 30-50% being concentrated in large (>10 kD) colloids (Ga, Y, REEs, Pb, Cd, V, Nb, Sn, Ti, Zr, Hf, Th, U). For most trace metals, the proportion in the colloidal fraction correlates with their first hydrolysis constant. This implies a strong control of negatively charged oxygen donors present in inorganic/organic colloids on TE distribution between aqueous solution and colloid particles. It is suggested that these colloids are formed during plant uptake of Al, Fe, and TE from mineral matrix of deep soil horizons and their subsequent release in surface horizons after litter degradation and oxygenation on redox or acid/base fronts. Dissolved organic matter stabilizes Al/Fe colloids and thus enhances trace elements transport in soil solutions.

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“…The water types are (1) the clear waters from the weathering front (hillside and swamp), (2) the clear waters from the upper fringe of the hillside aquifer and (3) the coloured water (tea colour) from the swamp surface and the Mengong brook. Filtration experiments from 0.45 µm to 1 KD (tangential and frontal ultra-filtration) were also carried out in order to find out (1) the chemical and the mineral composition of the particulate and colloidal phases and (2) the chemical composition of the «true» dissolved phase [Viers et al, 1997;Olivie Lauquet, 1996;Olivie Lauquet et al, 1999;Rose et al, 1998;Olivie Lauquet et al, 2000]; the knowledge of this distribution is necessary to set up a thermodynamic model.…”

Section: The Mengong and The Groundwater Tablementioning

confidence: 99%

Biogeohydrodynamic in the forested humid tropical environment: the case study of the Nsimi small experimental watershed (south Cameroon)

Braun¹,

Dupré²,

Viers³

et al. 2002

Bulletin De La Société Géologique De France

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Abstract. -This paper summarizes a six-year study of the Nsimi Small Experimental Watershed (SEW), considered as a model for the South Cameroon humid tropical ecosystem. When this small watershed was set up, no similar survey of input/output hydrobiogeochemical fluxes in granitoid rocks in stable cratonic environment was available, to our knowledge, on any site close to the Equator. Moreover, this is the first attempt, world-wide, to combine different approaches in hydrology, (bio)geochemistry, mineralogy, crystallography, microbiology, geophysics and pedology. Research is based on (1) regular hydrobiogeochemical surveys in various water reservoirs of the SEW ecosystem (atmospheric deposits, groundwater and stream), (2) surveys related either to the organisation and composition of different reservoirs in the superficial layers (basement rocks, saprolite, soils) or to various hydrological, biological and geochemical processes. These surveys aim at (1) finding the main parameters involved in the chemical and physical erosion processes of the humid tropical ecosystem, (2) understanding the source of a particular chemical composition in groundwater and rivers, (3) documenting accurately the different exportation processes of chemical elements in water and soil (4) investigating the possible relation between the biodegradation of soil organic matter and the leaching of metals (especially iron) and (5) comparing the long and short term weathering rates using mass balance calculations. An other important objective of this study is to provide a new scientific and engineering database for the future development of South Cameroon, which is still nowadays a relatively preserved ecosystem.One of the major results is the essential role played by the biological cycle (vegetation and soil organic matter) in the fractionation, exportation or storage of the chemical elements in humid tropical environments. Moreover we are able to propose a model of the current erosion for this SEW from the database obtained on (1) the mineralogy of the basement rocks and the soil layers, (2) the geochemistry of the soluble and colloidal phases of waters and (3) the hydrology within the different reservoirs of the hydrosystem. This model has been confirmed and extended on a regional scale (Nyong river basin). It emphasized the behaviour of the main elements of the tropical soil layers (Fe, Al, Si), the nutrients (C, Ca, Mg, K, Sr) and specific tracers of the weathering processes either with strong mobility (Cl, Na) or on the contrary with an extremely low mobility (Zr, Th, REEs).On the SEW scale, a strong geochemical contrast occurs between the different groundwater zones flooding (1) the hill slope lateritic profiles, (2) the weathering front (interface between the saprolite and the basement rocks), and (3) the swampy zone in which the Mengong brook flows. High DOC contents (15 mg/L) but also high Fe, Th, Al, Zr contents characterize the swampy zone waters. Na and Si have mainly a deep origin (exfiltration), Al, Th, Zr and REEs are strongly link...

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Chemical distribution of trivalent iron in riverine material from a tropical ecosystem: a quantitative EPR study

Cited by 55 publications

References 32 publications

Carbon and metal concentrations, size distributions and fluxes in major rivers of the Amazon basin

Carbon and metal concentrations, size distributions and fluxes in major rivers of the Amazon basin

Fe–Al–organic Colloids Control of Trace Elements in Peat Soil Solutions: Results of Ultrafiltration and Dialysis

Biogeohydrodynamic in the forested humid tropical environment: the case study of the Nsimi small experimental watershed (south Cameroon)

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