Synergistic effects of the combination of oxalate and ascorbate on arsenic extraction from contaminated soils

Lee, Jae-Cheol; Kim, Eun Jung; Baek, Kitae

doi:10.1016/j.chemosphere.2016.11.155

Cited by 22 publications

(9 citation statements)

References 23 publications

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“…The results of arsenic extraction in the washing experiment indicated that biodegradable acids, such as oxalic, citric and its combination with ascorbic, can be considered as a means of remediating As-contaminated soils. This is consistent with the outcome of other authors [ 31 , 47 , 55 ].…”

Section: Discussionsupporting

confidence: 94%

“…In previous studies, many authors obtained a significant amount of arsenic and iron extraction using ascorbic acid in a range from 0.01 to 0.1 M [ 47 , 48 , 49 ]. In this present study, 0.1 M ascorbic acid was adopted to combine with 0.2 M oxalic acid and 0.2 M citric acid to obtain the mixture solutions that were used in the washing experiment.…”

Section: Resultsmentioning

confidence: 99%

“…In previous studies, the efficiency and mechanisms of organic acid on metal extraction were reported [ 33 , 47 , 56 ]. The primary chemical dissolution mechanisms of metals using these organic acids are predominantly through acidification, complexation and reduction [ 57 , 58 ].…”

Section: Discussionmentioning

confidence: 99%

“…The efficiency of oxalic and citric acid mobilizes arsenic from soils and sediments by effectively dissolving As-bearing Fe (oxyhydr)oxides via a ligand-promoted reaction with two steps [ 33 , 47 , 56 ]. The first step of the dissolution reaction is the adsorption of carboxylic acid on the surface of iron (oxyhydr)oxides and then formation of the surface complexation on the system interface; the second step is the detachment of the iron complex to the aqueous environment, as follows: ≡Fe III –OH + + L n− + H + → [≡Fe III –L] −(n−2) + H 2 O [≡Fe III –L] −(n−2) + H + → [Fe 3+ –L] −(n−3) (aq) + H≡ where L n− is the organic ligand with oxidation number n; (aq): aqueous.…”

Section: Discussionmentioning

confidence: 99%

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Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil

Van

Osanai

Nguyen

et al. 2017

IJERPH

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A series of arsenic remediation tests were conducted using a washing method with biodegradable organic acids, including oxalic, citric and ascorbic acids. Approximately 80% of the arsenic in one sample was removed under the effect of the ascorbic and oxalic acid combination, which was roughly twice higher than the effectiveness of the ascorbic and citric acid combination under the same conditions. The soils treated using biodegradable acids had low remaining concentrations of arsenic that are primarily contained in the crystalline iron oxides and organic matter fractions. The close correlation between extracted arsenic and extracted iron/aluminum suggested that arsenic was removed via the dissolution of Fe/Al oxides in soils. The fractionation of arsenic in four contaminated soils was investigated using a modified sequential extraction method. Regarding fractionation, we found that most of the soil contained high proportions of arsenic (As) in exchangeable fractions with phosphorus, amorphous oxides, and crystalline iron oxides, while a small amount of the arsenic fraction was organic matter-bound. This study indicated that biodegradable organic acids can be considered as a means for arsenic-contaminated soil remediation.

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Section: Discussionsupporting

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil

Van

Osanai

Nguyen

et al. 2017

IJERPH

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“…In a subsequent study using density function theory, Kubicki et al found that adsorption of Fe(II) near an Fe(III) corner site with adsorbed oxalate lead to a weakening of bonds between the corner site and the lattice, explaining a faster rate of detachment of this site from the lattice. A synergistic effect between oxalate and ascorbate was also recently reported in the extraction of arsenic from contaminated soils …”

Section: Introductionmentioning

confidence: 54%

Fe(II)-Catalyzed Ligand-Controlled Dissolution of Iron(hydr)oxides

Biswakarma

Kang

Borowski

et al. 2018

Environ. Sci. Technol.

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Dissolution of iron(III)phases is a key process in soils, surface waters and the ocean. Previous studies found that traces of Fe(II) can greatly increase ligand controlled dissolution rates at acidic pH, but the extent that this also occurs at circumneutral pH and what mechanisms are involved are not known. We addressed these questions with infrared spectroscopy and 57 Fe isotope exchange experiments with lepidocrocite (Lp) and 50 µM ethylenediaminetetraacetate (EDTA) at pH 6 and 7. Addition of 0.2-10 µM Fe(II) led to an acceleration of the dissolution rates by factors of 7-31. Similar effects were observed after irradiation with 365 nm UV light. The catalytic effect persisted under anoxic conditions, but ceased as soon as air or phenanthroline was introduced. Isotope exchange experiments showed that added 57 Fe remained in solution, or quickly reappeared in solution when EDTA was added after 57 Fe(II), suggesting that catalyzed dissolution occurred at or near the site of 57 Fe incorporation at the mineral surface. Infrared spectra indicated no change in the bulk, but changes in the spectra of adsorbed EDTA after addition of Fe(II) were observed. A kinetic model shows that the catalytic effect can be explained by electron transfer to surface Fe(III) sites and rapid detachment of Fe(III)EDTA due to the weaker bonds to reduced sites. We conclude that the catalytic effect of Fe(II) on dissolution of Fe(III)(hydr)oxides is likely important under circumneutral anoxic conditions and in sunlit environments.

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A novel bio-washing eluent obtained from fermentation of fruit wastes for removal of soil Pb: efficiency, mechanism, and risk assessment

Pan

Zhang

et al. 2022

Environ Sci Pollut Res

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Synergistic effects of the combination of oxalate and ascorbate on arsenic extraction from contaminated soils

Cited by 22 publications

References 23 publications

Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil

Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil

Fe(II)-Catalyzed Ligand-Controlled Dissolution of Iron(hydr)oxides

A novel bio-washing eluent obtained from fermentation of fruit wastes for removal of soil Pb: efficiency, mechanism, and risk assessment

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