Combined effects of low-molecular-weight organic acids on mobilization of arsenic and lead from multi-contaminated soils

Onireti, Olaronke O.; Lin, Cheng‐Fang; Qin, Junhao

doi:10.1016/j.chemosphere.2016.12.024

Cited by 67 publications

(25 citation statements)

References 53 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%

“…During the past decades, several studies have been conducted to evaluate the effectiveness of various single chemical agents on arsenic removal in soils and sediments, such as HCl acid, H 3 PO 4 acid, ethylenediaminetetraacetic acid (EDTA), Na 2 EDTA, and surfactants [ 25 , 26 , 27 , 28 ]. Some biodegradable organic acids (e.g., oxalic acid, citric acid, and ascorbic acid), which are active components in the root exudates of plants [ 29 , 30 ], were also reported to have a significant effect on arsenic extraction from soils and sediments [ 31 , 32 , 33 ]. These acids attain much higher anionic metal extractions compared to other chelate agents, such as EDTA or Na 2 EDTA [ 34 , 35 , 36 ].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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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“…2). This was accompanied by the release of trace elements (As, Ba, Cd, Co, Cr, Cu, Ni, Pb, Sr and Zn) that were likely to be bound to these oxides, as shown in previous work (Onireti and Lin, 2016;Onireti et al, 2017).…”

Section: Discussionsupporting

confidence: 67%

Biochar immobilizes soil-borne arsenic but not cationic metals in the presence of low-molecular-weight organic acids

Alozie

Heaney

Lin

2018

Science of The Total Environment

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A batch experiment was conducted to examine the effects of biochar on the behaviour of soil-borne arsenic and metals that were mobilized by three low-molecular-weight organic acids. In the presence of citric acid, oxalic acid and malic acid at a molar concentration of 0.01M, the surface of biochar was protonated, which disfavours adsorption of the cationic metals released from the soil by organic acid-driven mobilization. In contrast, the oxyanionic As species were re-immobilized by the protonated biochar effectively. Biochar could also immobilize oxyanionic Cr species but not cationic Cr species. The addition of biochar increased the level of metals in the solution due to the release of the biochar-borne metals under attack by LMWOAs via cation exchange. Biochar could also have the potential to enhance reductive dissolution of iron and manganese oxides in the soil, leading to enhanced release of trace elements bound to these oxides. The findings obtained from this study have implications for evaluating the role of biochar in immobilizing trace elements in rhizosphere. Adsorption of cationic heavy metals on biochar in the presence of LMWOAs is unlikely to be a mechanism responsible for the impeded uptake of heavy metals by plants growing in heavy metal-contaminated soils.

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“…This is not in agreement with many other findings that show Pb is favourably bound to oxides of iron and manganese [32][33][34][35][36]. Previous investigation suggested that Pb in contaminated soils at this site was mainly in the form of lead sulfate [37]. Consequently, the mobilization of Pb was not related to the dissolution of Fe, Mn, and Al oxides.…”

Section: Discussioncontrasting

confidence: 91%

Dynamics of Fe, Mn, and Al Liberated from Contaminated Soil by Low-Molecular-Weight Organic Acids and Their Effects on the Release of Soil-Borne Trace Elements

2018

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A 15-day batch experiment was conducted to investigate the behaviours of Fe, Mn, and Al oxides upon attack by three common low-molecular-weight organic acids, and their effects on liberation of trace elements from a multi-contaminated soil. While the capacity of malic acid to mobilize soil-borne Fe, Mn, and Al was weaker compared to citric and oxalic acids, a similar trend was observed, showing that the concentration of dissolved Fe, Mn, and Al increased with increasing duration of the experiment. Marked increase in metal concentrations only took place after 5 or 7 days of the experiment. For the same organic acid treatment, Fe, Mn, and Al all showed a very similar temporal variation pattern. The concentration of dissolved Fe, Mn, and Al was markedly controlled by the total Fe, Mn, and Al contained in the soil, respectively. It appears that manganese oxides were more reactive to the organic acids, as compared to their Fe and Al counterparts. However, when multiple organic acids were present, the soil-borne Fe, Mn, and Al were mobilized rapidly within the first 5 or 7 days of the experiment and then tended to decrease. The formation of insoluble Fe, Mn, and Al organic complexes tended to be enhanced due to co-existence of multiple organic acids, resulting in the re-immobilization of the dissolved Fe, Mn, and Al. The organic acid-driven dissolution of Fe, Mn, or Al had a major control on the mobilization of As, Cr, Zn, Ni, Cu, and Cd that were bound to these oxides with a correlation coefficient being frequently greater than 0.9 for As, Cr, Zn, and Ni.

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Combined effects of low-molecular-weight organic acids on mobilization of arsenic and lead from multi-contaminated soils

Cited by 67 publications

References 53 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

Biochar immobilizes soil-borne arsenic but not cationic metals in the presence of low-molecular-weight organic acids

Dynamics of Fe, Mn, and Al Liberated from Contaminated Soil by Low-Molecular-Weight Organic Acids and Their Effects on the Release of Soil-Borne Trace Elements

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