Ferrous Iron Treatment of Soils Contaminated with Arsenic-Containing Wood-Preserving Solution

Moore, Terry J.; Rightmire, Claude Michael; Vempati, R. K.

doi:10.1080/10588330091134310

Cited by 55 publications

(28 citation statements)

References 52 publications

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“…The concentration of As in the first step of a sequential extraction, which included the most labile As fraction, was greatly reduced with the FeSO 4 addition (Yang et al 2007). Moore et al (2000) used FeSO 4 to immobilize As in contaminated soils from wood-preserving solution at a timber-framing site and achieved good results. The result of Kim and Davis (3003) also showed that with ferric sulfate or ferrous sulfate addition, the mobility and solubility of Pb did not increase.…”

Section: Water-soluble As and Cacl 2 -Extractable Pbmentioning

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: Water-soluble As and Cacl 2 -Extractable Pbmentioning

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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“…Ferrous sulfate has been used as a binding agent for the treatment of arsenic-contaminated soils by other researchers (Voigot et al, 1996;Moore et al, 2000); however, these studies also failed to find any evidence of insoluble ferric arsenate being produced. The previous characterization study of untreated FW and BH soils showed that arsenic was primarily associated with soil particle surfaces, rather than located in individual arsenic-rich grains (Yang and Donahoe, 2007).…”

Section: Discussionmentioning

confidence: 99%

In situ chemical fixation of arsenic-contaminated soils: An experimental study

Yang

Donahoe

Redwine

2007

Science of The Total Environment

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This paper reports the results of an experimental study testing a low-cost in situ chemical fixation method designed to reclaim arsenic-contaminated subsurface soils. Subsurface soils from several industrial sites in southeastern U.S. were contaminated with arsenic through heavy application of herbicide containing arsenic trioxide. The mean concentrations of environmentally available arsenic in soils collected from the two study sites, FW and BH, are 325 mg/kg and 900 mg/kg, respectively. The soils are sandy loams with varying mineralogical and organic contents. The previous study [Yang L, Donahoe RJ. The form, distribution and mobility of arsenic in soils contaminated by arsenic trioxide, at sites in Southeast USA. Appl Geochem 2007;22:320-341] indicated that a large portion of the arsenic in both soils is associated with amorphous aluminum and iron oxyhydroxides and shows very slow release against leaching by synthetic precipitation. The soil's amorphous aluminum and iron oxyhydroxides content was found to have the most significant effect on its ability to retain arsenic. Based on this observation, contaminated soils were reacted with different treatment solutions in an effort to promote the formation of insoluble arsenic-bearing phases and thereby decrease the leachability of arsenic. Ferrous sulfate, potassium permanganate and calcium carbonate were used as the reagents for the chemical fixation solutions evaluated in three sets of batch experiments: (1) FeSO4; (2) FeSO4 and KMnO4; (3) FeSO4, KMnO4 and CaCO3. The optimum treatment solutions for each soil were identified based on the mobility of arsenic during sequential leaching of treated and untreated soils using the fluids described in EPA (SPLP). Both FW and BH soils showed significant decreases in arsenic leachability for all three treatment solutions, compared to untreated soil. While soils treated with solution (3) showed the best results with subsequent TCLP sequential leaching, SPLP sequential leaching of treated soils indicated that lowest arsenic mobility was obtained using treatment solution (1). Treatment solution (1) with only FeSO4 is considered the best choice for remediation of arseniccontaminated soil because SPLP sequential leaching better simulates natural weathering. Analysis of treated soils produced no evidence of newly-formed arsenic-bearing phases in either soil after treatment. Sequential chemical extractions of treated soils indicate that surface complexation of arsenic on ferric hydroxide is the major mechanism for the fixation process.

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“…On the contrary, the addition of FeSO 4 decreased the stability of Pb, Zn, Cu and Cd in soil. Comparing the different effectiveness of FeSO 4 on heavy metals and As, it can be deduced that FeSO 4 had exclusive stabilizing capacity for As (Moore, et al, 2000, Carlson, et al, 2002. Other single stabilizers including CaO and Na 2 S also presented high stabilizing capacity for As in soil.…”

Section: The Stabilizing Effectiveness Of the Single Stabilizersmentioning

confidence: 97%

Effectiveness of Single and Composited Stabilizers on Enhancing Stability of Multiple Metals in Mine Soil

Xu¹,

Zhang²,

Cheng³

et al. 2017

dteees

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Abstract. The soil pollution is getting worse with the rapid development of industry in recent years, Heavy metals can ultimately affect human health through the food chain. So immobilization of heavy metals in soil is of great significance. Here, six single stabilizer and six composite stabilizers, including CaO, bone char (BC), Na 2 S, calcium superphosphate (SSP), sodium diethyldithiocarbamate (DDTC-Na) and FeSO 4 , were investigated to immobilize heavy metals and As in mine soil. Toxicity Characteristic Leaching Procedure (TCLP) was adopted to evaluate the stabilization effectiveness of the stabilizers on Pb, Zn, Cu, Cd and As, and the best stabilizers for simultaneously immobilizing Pb, Zn, Cu, Cd and As in soil were selected based on the TCLP results. The results in this study provide useful information for remediation of heavy metals contaminated soil.

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Ferrous Iron Treatment of Soils Contaminated with Arsenic-Containing Wood-Preserving Solution

Cited by 55 publications

References 52 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

In situ chemical fixation of arsenic-contaminated soils: An experimental study

Effectiveness of Single and Composited Stabilizers on Enhancing Stability of Multiple Metals in Mine Soil

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