Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Garnier, Jean‐Marie; Hurel, Charlotte; Garnier, Jérémie; Lenoble, Véronique; Garnier, Cédric; Ahmed, Kazi Matin; Rose, Jérôme

doi:10.1016/j.apgeochem.2011.04.023

Cited by 19 publications

(23 citation statements)

References 39 publications

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“…For a given element, lower concentrations in one of two different size fractions indicate the presence of a particulate form of this element. This finding, as well as variations in the ratios between certain elements among different size fractions, can be used to determine the impact, if any, of different components on metals and colloid formation (Garnier et al 2011). The presence of Cr(VI) and Ni in the filtered solutions, even at 10 kDa, in both soil and surface waters from the stream and runoff, proves that these elements are mobile at the catchment scale in "truly" dissolved forms.…”

Section: Metal Mobilitymentioning

confidence: 87%

“…Since colloidal particles have been proven to play a key role in metal mobility in solutions of soils developed on ultramafic rock (Gasser et al 1994, Zelano et al 2013, Bolaños-Benítez et al 2018), a special investigation was conducted using all solutions sampled during the sampling of February 2008, including runoff waters. A size fractionation approach was performed on soil and surface solutions using the frontal cascade filtration technique (Patel-Sorrentino et al 2007, Garnier et al 2011. In the field, solutions were successively filtered at nominal cut-offs of 0.22 μm, 0.025 μm, and 10 kDa, leading to the collection of four θ fractions (unfiltered, θ 0 ; 0.22 > θ 1 > 0.025 μm; 0.025 > θ 2 > 10 kDa; 10 kDa > θ 3 ).…”

Section: Water Samplingmentioning

confidence: 99%

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Field availability and mobility of metals in Ferralsols developed on ultramafic rock of Niquelândia, Brazil

et al. 2021

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Ultramafic (UM) rocks are defined as igneous rocks that contain more than 90% of mafic minerals. Soils derived from ultramafic rock are generally nutrient-deficient and have concomitant high concentrations of potentially phytotoxic trace elements (Ni, Cr, Co, Mn). Consequently, to assess the dynamics of nutrients and metals in the ultramafic complex of Niquelândia (Brazil), soil solutions have been sampled in soils characterized by high Cr(VI) availability. The metal contents in surficial water have also been analyzed to investigate the metals' leaching and mobility. Soil solutions featured low nutrient contents, a large Ca:Mg imbalance, and high Ni and Cr concentrations. Chromium was present in its toxic dissolved form (Cr(VI)) in the soil and surficial solutions. Metals concentrations were often above the toxic limit for biota and were therefore able to affect soil functioning. Ni behavior in the topsoil appeared to be primarily controlled by organic matter, while Cr was more likely to be released from Fe-oxides by anionic exchange. This result agreed with the Cr(VI) lability assessed using isotopic exchange kinetics in a companion study. In these serpentinic tropical soils, the highly leached Fe-oxide horizons appear to play a large role in the sequestration and diffuse leaching of labile Cr(VI) and Ni, respectively, in the deeper part of soil profiles and the topsoil. At the catchment scale, surficial solutions results suggest that metals may be exported to surrounding ecosystems that are not adapted to these metals.

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Section: Metal Mobilitymentioning

confidence: 87%

Section: Water Samplingmentioning

confidence: 99%

Field availability and mobility of metals in Ferralsols developed on ultramafic rock of Niquelândia, Brazil

et al. 2021

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“…Ultra-filtration is a rapid and suitable tool used to perform size separation on natural samples (Burdige and Gardner, 1998;Marsac et al, 2010;Garnier et al, 2011). In this study, porewater samples taken from station 12 in July 2012, March 2013, and July 2013 were ultra-filtered at 3 kDa (Vivaspin 2-PES VS0291, Sartorius).…”

Section: Centrifugal Ultra-filtrationmentioning

confidence: 99%

Sedimentary dynamics of coastal organic matter: An assessment of the porewater size/reactivity model by spectroscopic techniques

Dang

Lenoble

Durrieu

et al. 2014

Estuarine, Coastal and Shelf Science

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“…SiO 4 4is the second effective competitor for As adsorption on Fe-(hydr)oxide next to PO 4 3- (Garnier et al, 2011). Under alkaline conditions, the formation of Fe-(hydr)oxide complexes with As might be further inhibited by the high Si contents in WB and CP.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

et al. 2017

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This study evaluated the feasibility of using biochars produced from three types of crop residues for immobilizing Pb and As and their effects on the abundance of microbial community in contaminated lowland paddy (P-soil) and upland (U-soil) agricultural soils. Biochars were produced from umbrella tree [Maesopsis eminii] wood bark [WB], cocopeat [CP], and palm kernel shell [PKS] at 500 °C by slow pyrolysis at a heating rate of 10 °C min. Soils were incubated with 5% (w w) biochars at 25 °C and 70% water holding capacity for 45 d. The biochar effects on metal immobilization were evaluated by sequential extraction of the treated soil, and the microbial community was determined by microbial fatty acid profiles and dehydrogenase activity. The addition of WB caused the largest decrease in Pb in the exchangeable fraction (P-soil: 77.7%, U-soil: 91.5%), followed by CP (P-soil: 67.1%, U-soil: 81.1%) and PKS (P-soil: 9.1%, U-soil: 20.0%) compared to that by the control. In contrast, the additions of WB and CP increased the exchangeable As in U-soil by 84.6% and 14.8%, respectively. Alkalinity and high phosphorous content of biochars might be attributed to the Pb immobilization and As mobilization, respectively. The silicon content in biochars is also an influencing factor in increasing the As mobility. However, no considerable effects of biochars on the microbial community abundance and dehydrogenase activity were found in both soils.

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Strong chemical evidence for high Fe(II)-colloids and low As-bearing colloids (200nm–10kDa) contents in groundwater and flooded paddy fields in Bangladesh: A size fractionation approach

Cited by 19 publications

References 39 publications

Field availability and mobility of metals in Ferralsols developed on ultramafic rock of Niquelândia, Brazil

Field availability and mobility of metals in Ferralsols developed on ultramafic rock of Niquelândia, Brazil

Sedimentary dynamics of coastal organic matter: An assessment of the porewater size/reactivity model by spectroscopic techniques

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

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