Desorption of Heavy Metals from Lime-Stabilized Arid-Soils using Different Extractants

Moghal, Arif Ali Baig; Mohammed, Syed Abu Sayeed; Almajed, Abdullah; Al‐Shamrani, Mosleh

doi:10.1007/s40999-019-00453-y

Cited by 32 publications

(10 citation statements)

References 44 publications

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“…EDTA was commonly used to extract heavy metal cations. 7,43 Previous studies have shown that EDTA had a better desorption effect on Pb( ii ) than HNO 3 and acetic acid. 43 Therefore, EDTA was chosen to extract the adsorbed Pb( ii ) of the surface of ferrihydrite in this study.…”

Section: Resultsmentioning

confidence: 99%

Insights on Pb(ii) retention and immobilization by ferrihydrite in the presence of Al(iii) and oxalic acid

Ariya

et al. 2022

Environ. Sci.: Nano

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Section: Resultsmentioning

confidence: 99%

Insights on Pb(ii) retention and immobilization by ferrihydrite in the presence of Al(iii) and oxalic acid

Ariya

et al. 2022

Environ. Sci.: Nano

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“…The formation of stable non-adsorbing chelates in the solution lowers the free metal ion activity, leading to metal ion desorption from the solid surfaces (Violante 2013). Moghal et al (2019) also reported that the desorption efficiency of Pb by EDTA from soils was in the range of 69-93%.…”

Section: Ligand Effects On Pb Desorptionmentioning

confidence: 99%

Comparative ability of EDTA, GLDA, and MGDA to desorb Pb from contaminated montmorillonite: Aging effects

Shirvani

Parsadoust

Shariatmadari

et al. 2022

Preprint

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Study of Pb desorption processes from clay minerals by chelating ligands is crucial to better understand the fate and transport of Pb in soil and sediment environments. In this study, Pb desorption from a Pb-loaded montmorillonite (MMT) was studied as affected by ethylenediaminetetraacetic acid (EDTA) and its two alternative eco-friendly chelating agents, i.e., methylglycine diacetic acid (MGDA) and glutamic-N,N-diacetic acid (GLDA) at two concentrations of 0.25 and 1.0 mM. The impacts of a 30-day residence time on the rate and quantity of Pb desorption were also evaluated. The result showed that Pb desorption kinetics was biphasic with an initial rapid phase, lasting for about 3 h, followed by a slow phase, lasting to 12 h. The degree of Pb desorption from Ca-MMT was proven to be governed by the nature and concentration of the chelating ligands presented in the systems. The capacity of the ligands to desorb Pb from Ca-MMT was in the order EDTA > > MGDA > GLDA, according to the decreasing order in the stability constants of their complexes with Pb ions. The aging of the MMT systems caused a significant reduction in both Pb desorption quantity and rate parameters. The results suggest that EDTA would have a more serious Pb-mobilizing impact than GLDA and MGDA in contaminated soil and sediments which contain Ca-MMT as a major clay constituent.

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“…The heavy metal desorption process is affected by the pH of the pore fluid solution [42]. Even waste soils with neutral pH values exhibit significant levels of heavy metal sorption [92].…”

Section: Retention In Soilsmentioning

confidence: 99%

“…Concentrations of metals in the soil are governed by anthropogenic effects, pedogenic processes, and parent material [36]. Immobilization [37], phytoremediation [38,39], and soil washing [40] methods are adopted to achieve remediation of heavy metals in soils [7,41,42]. Remediation of contaminated soils can be performed using in situ or ex situ methods based on site conditions [4,43].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Enzymatically Induced Calcium Carbonate Precipitation in the Retention of Heavy Metal Ions

Moghal

Lateef²,

Mohammed³

et al. 2020

Sustainability

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This study evaluated the efficacy of enzyme induced calcite precipitation (EICP) in restricting the mobility of heavy metals in soils. EICP is an environmentally friendly method that has wide ranging applications in the sustainable development of civil infrastructure. The study examined the desorption of three heavy metals from treated and untreated soils using ethylene diamine tetra-acetic acid (EDTA) and citric acid (C6H8O7) extractants under harsh conditions. Two natural soils spiked with cadmium (Cd), nickel (Ni), and lead (Pb) were studied in this research. The soils were treated with three types of enzyme solutions (ESs) to achieve EICP. A combination of urea of one molarity (M), 0.67 M calcium chloride, and urease enzyme (3 g/L) was mixed in deionized (DI) water to prepare enzyme solution 1 (ES1); non-fat milk powder (4 g/L) was added to ES1 to prepare enzyme solution 2 (ES2); and 0.37 M urea, 0.25 M calcium chloride, 0.85 g/L urease enzyme, and 4 g/L non-fat milk powder were mixed in DI water to prepare enzyme solution 3 (ES3). Ni, Cd, and Pb were added with load ratios of 50 and 100 mg/kg to both untreated and treated soils to study the effect of EICP on desorption rates of the heavy metals from soil. Desorption studies were performed after a curing period of 40 days. The curing period started after the soil samples were spiked with heavy metals. Soils treated with ESs were spiked with heavy metals after a curing period of 21 days and then further cured for 40 days. The amount of CaCO3 precipitated in the soil by the ESs was quantified using a gravimetric acid digestion test, which related the desorption of heavy metals to the amount of precipitated CaCO3. The order of desorption was as follows: Cd > Ni > Pb. It was observed that the average maximum removal efficiency of the untreated soil samples (irrespective of the load ratio and contaminants) was approximately 48% when extracted by EDTA and 46% when extracted by citric acid. The soil samples treated with ES2 exhibited average maximum removal efficiencies of 19% and 10% when extracted by EDTA and citric acid, respectively. It was observed that ES2 precipitated a maximum amount of calcium carbonate (CaCO3) when compared to ES1 and ES3 and retained the maximum amount of heavy metals in the soil by forming a CaCO3 shield on the heavy metals, thus decreasing their mobility. An approximate improvement of 30% in the retention of heavy metal ions was observed in soils treated with ESs when compared to untreated soil samples. Therefore, the study suggests that ESs can be an effective alternative in the remediation of soils contaminated with heavy metal ions.

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Desorption of Heavy Metals from Lime-Stabilized Arid-Soils using Different Extractants

Cited by 32 publications

References 44 publications

Insights on Pb(ii) retention and immobilization by ferrihydrite in the presence of Al(iii) and oxalic acid

Insights on Pb(ii) retention and immobilization by ferrihydrite in the presence of Al(iii) and oxalic acid

Comparative ability of EDTA, GLDA, and MGDA to desorb Pb from contaminated montmorillonite: Aging effects

Efficacy of Enzymatically Induced Calcium Carbonate Precipitation in the Retention of Heavy Metal Ions

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