Decreasing arsenic bioaccessibility/bioavailability in soils with iron amendments

Subacz, Jonathan L.; Barnett, Mark O.; Jardine, Philip M.; Stewart, Melanie

doi:10.1080/10934520701436047

Cited by 32 publications

(22 citation statements)

References 36 publications

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“…In the present study, with the FeSO 4 addition, the concentrations of CaCl 2 -extractable Pb increased, but the bioaccessibility of Pb decreased. Many studies showed that Fe amendments (FeCl 3 , FeCl 2 ·4H 2 O, ferrihydrite, Fe 0 , and FeBr 3 ) may be an effective strategy to decrease As bioaccessibility and bioavailability, and to remediate As-contaminated soils (Martin and Ruby 2003;Subacz et al 2007). In the present study, FeSO 4 addition decreased the bioaccessibility of soil As in all the treatments in gastric and small intestinal phase.…”

Section: Bioaccessibility Of As and Pb In Soilmentioning

confidence: 99%

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Cui

Weng

et al. 2010

Water Air Soil Pollut

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The effect of in situ immobilization of lead (Pb) and arsenic (As) in soil with respectively phosphate and iron is well recognized. However, studies on combined Pb and As-contaminated soil are fewer, and assessment of the effectiveness of the immobilization on mobility and bioaccessibility is also necessary. In this study, a Pb and As-contaminated soil was collected from an abandoned lead/zinc mine in Shaoxing, Zhejiang province of China, which has been treated with three phosphates, i.e., calcium magnesium phosphate (CMP), phosphate rock, and single super-phosphate (SSP) for 6 months in a field study. The ferrous sulfate (FeSO 4 ) at 20 g kg −1 was then amended to the soil samples and incubated for 8 weeks in a greenhouse. The solubility and bioaccessibility tests were used to assess the effectiveness of the in situ immobilization. The result showed that phosphates addition decreased the concentrations of CaCl 2 -extractable Pb; however, the concentrations of water-soluble As increased upon CMP and SSP addition. With the iron addition, the water-soluble As concentrations decreased significantly, but CaCl 2 -extractable Pb concentrations increased. The bioaccessibility of As and Pb measured in artificial gastric and small intestinal solutions decreased with phosphate and iron application except for the bioaccessibility of As in the gastric phase with SSP addition. Combined application of phosphates and iron can be an effective approach to lower bioaccessibility of As and Pb, but has opposing effects on mobility of As and Pb in contaminated soils.

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Section: Bioaccessibility Of As and Pb In Soilmentioning

confidence: 99%

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Cui

Weng

et al. 2010

Water Air Soil Pollut

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“…BARGE has been involved in comparing and evaluating the physico-chemical processes within the many models and systems that have been developed over the years to measure bioaccessibility and contaminant exposure e.g. (Oomen et al, 2002;Basta et al, 2007;Cave et al, 2007;Chan et al, 2007;Gal et al, 2007;Gron et al, 2007;Ljung et al, 2007;Nathanail and Smith, 2007;Palumbo-Roe and Klinck, 2007;Subacz et al, 2007;Van de Wiele et al, 2007;Wragg and Klinck, 2007). A priority objective is to provide robust and defensible data on bioaccessibility that can be used in human health risk assessments and policy making.…”

Section: Introductionmentioning

confidence: 99%

“…The key contaminants included in this work are arsenic (As), lead (Pb) and cadmium (Cd) as they are potentially harmful to human health (ATSDR, 2007b;ATSDR, 2007a;ATSDR, 2008) and the most common elements undergoing bioaccessibility research Ruby et al, 1993;Ruby et al, 1996;Albores et al, 2000;Oomen et al, 2002;Marschner et al, 2006;Chan et al, 2007;Datta et al, 2007;Drexler and Brattin, 2007;Finzgar et al, 2007;Hansen et al, 2007;Juhasz et al, 2007aJuhasz et al, , 2007bLjung et al, 2007;Sarkar et al, 2007;Subacz et al, 2007;Turner and Ip, 2007;Van de Wiele et al, 2007;Beak et al, 2008;Moseley et al, 2008;Girouard and Zagury, 2009;Morman et al, 2009;Nagar et al, 2009;Poggio et al, 2009;Smith et al, 2009;Zhang et al, 2009;Demetriades et al, 2010;Juhasz et al2010). …”

Section: Introductionmentioning

confidence: 99%

An inter-laboratory trial of the unified BARGE bioaccessibility method for arsenic, cadmium and lead in soil

Wragg

Cave

Basta

et al. 2011

Science of The Total Environment

166

202

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The Bioaccessibility Research Group of Europe (BARGE) has carried out an interlaboratory trial of a proposed harmonised in vitro physiologically based ingestion bioaccessibility procedure for soils, called the Unified BARGE Method (UBM). The UBM includes an initial saliva phase and simulated stomach and intestine compartments. The trial involved the participation of seven laboratories (five European and two North American) providing bioaccessibility data for As (11 samples), Cd (9 samples) and Pb (13 samples) using soils with in vivo relative bioavailability data measured using a swine model. The results of the study were compared with benchmark criteria for assessing the suitability of the UBM to provide data for human health risk assessments. Mine waste and slag soils containing high concentrations of As caused problems of poor repeatability and reproducibility which were alleviated when the samples were run at lower soil to solution ratios. The study showed that the UBM met the benchmark criteria for both the stomach and stomach & intestine phase for As. For Cd, three out of four criteria were met for the stomach phase but only one for the stomach & intestine phase. For Pb two, out of four criteria were met for the stomach phase and none for the stomach & intestine phase. However, the study recommends tighter control of pH in the stomach phase extraction to improve between-laboratory variability, more reproducible in vivo validation data and that a follow up inter-laboratory trial should be carried out.

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“…A Student's t-test reveals that there is no significant difference between the results from the two treatment time. Earlier, Subacz [42] observed that the bioaccessibility of contaminated soils amended with FeCl 3 for 3 and 7 d differed significantly. These results suggest that the stabilized nanoparticles offer rather fast mass transfer and reaction kinetics, and equilibrium was reached within 3 d in all cases.…”

Section: Effects Of Treatment Timementioning

confidence: 99%

“…At the Fe/As ratio 100 : 1, the bioaccessibility decreased from the initial (71.3±3.1)% to (30.9±3.2)% for ZVI, and (37.6±1.2)% for FeS, and (29.8±3.1)% for Fe 3 O 4 nanoparticles. Earlier, Subacz [42] studied the reduction of bioaccessibility of the same soil when it was amended with FeCl 3 at an Fe/As molar ratio of 100 : 1, and observed a bioaccessibility reduction of 33%.…”

Section: Treatment Effects On Soluble Arsenic Removal and Soil Phmentioning

confidence: 99%

Immobilization of arsenic in soils by stabilized nanoscale zero-valent iron, iron sulfide (FeS), and magnetite (Fe3O4) particles

et al. 2010

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Arsenic is a widespread contaminant in soils and groundwater. While various iron-based materials have been studied for immobilizing arsenic in contaminated soils, the feasibility of stabilized iron-based nanoparticles has not been reported. This study investigates the effectiveness of using three types of starch-stabilized iron-based nanoparticles, including zero-valent iron (ZVI), iron sulfide (FeS), and magnetite (Fe 3 O 4 ), for immobilization of arsenic in two representative As-contaminated soils (an orchard soil and a fire range soil). To test the effect of the nanoparticles on the arsenic leachability, As-contaminated soils were amended with the nanoparticles at various Fe/As molar ratios (5 : 1-100 : 1) and contact time (3 and 7 d). After three days' treatments of a field-contaminated sandy soil, the PBET-based bioaccessibility of As decreased from an initial (71.3±3.1)% (mean±SD) to (30.9±3.2)% with ZVI, (37.6±1.2)% with FeS, and (29.8± 3.1)% with Fe 3 O 4 at an Fe/As molar ratio of 100 : 1. The TCLP-based leachability of arsenic in a spiked fire range soil decreased from an initial (0.51±0.11)% to (0.24±0.03)%, (0.27±0.04)% and (0.17±0.04)% by ZVI, FeS, and Fe 3 O 4 nanoparticles, respectively. The Fe 3 O 4 nanoparticles appeared to be more effective (5% or more) than other nanoparticles for immobilizing arsenic. When the two soils were compared, the treatment is more effective on the orchard soil that has a lower iron content and higher initial leachability than on the range soil that already has a high iron content. These results suggest that these innocuous iron-based nanoparticles may serve as effective media for immobilization of As in iron-deficient soils, sediments or solid wastes. particles. Chinese Sci Bull, 2010Bull, , 55: 365−372, doi: 10.1007 Various natural sources (e.g., natural geochemical reactions) and anthropogenic activities (e.g., mining, discharges of industrial wastes, military activities, and application of agricultural pesticides) can lead to arsenic (As) contamination of soils and groundwater. Arsenic is ranked the second most common inorganic pollutant in the U.S. superfund sites [1]. Arsenic-contaminated soils, sediments and waste slurry are major sources of arsenic in food and water. To mitigate the toxic effect on human health, the maximum contaminant level (MCL) for arsenic in the U.S. drinking water was lowered from the previous 50 ppb to 10 ppb, effective in January 2006. Arsenic is a redox active element, with As(V) or As (III) being the two most common stable oxidation states in soils [2]. In general, As(III) is more toxic than As(V), and inorganic arsenic is more toxic than organic arsenic [3], and arsenic in soils is less bioavailable and less bioaccessible than As in water due to soil adsorption effect [4].Arsenate can strongly interact with soils, especially, iron (hydr)oxides. Adsorption of arsenate by iron (hydr)oxides 366 ZHANG MeiYi, et al. Chinese Sci Bull February (2010) Vol.55 No.4-5 have been widely studied [5−13]. These studies have focused on the adsor...

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Decreasing arsenic bioaccessibility/bioavailability in soils with iron amendments

Cited by 32 publications

References 36 publications

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

Assessment of In Situ Immobilization of Lead (Pb) and Arsenic (As) in Contaminated Soils with Phosphate and Iron: Solubility and Bioaccessibility

An inter-laboratory trial of the unified BARGE bioaccessibility method for arsenic, cadmium and lead in soil

Immobilization of arsenic in soils by stabilized nanoscale zero-valent iron, iron sulfide (FeS), and magnetite (Fe3O4) particles

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