Guideline Values and Metal Contamination in Soils of an Environmentally Impacted Bay

Santos, Nielson Machado dos; Nascimento, Clístenes Williams Araújo do; Accioly, Adriana María de Aguiar

doi:10.1007/s11270-017-3279-7

Cited by 8 publications

(2 citation statements)

References 48 publications

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“…Soil in its natural form exhibits different components, such as phyllosilicates, humic substances, and carbonates, which contribute to the sorption process of heavy metals [35]. 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].…”

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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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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“…Prevention (PV) and investigation values (IV) for metals in two soil use scenarios (R = residential; I = industrial), and Cd, Pb and Zn concentrations in soil samples collected in different sites around the Pb smelter plant in Santo Amaro, Ba state, Brazil Pb, and Zn contents in the L3 were 446, 140, and 83 times higher than the background concentration of these metals for soils in the region (DosSantos et al 2017). These gures are much higher than the prevention and investigation values established by the Brazilian resolution for permissible levels of metals in agricultural soils(Conama, 2009).…”

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confidence: 99%

Assessing the phytoextraction of Cd, Pb, and Zn from a slag-contaminated soil by legume species inoculated with rhizobial strains

Silva,

Freitas,

Silva

et al. 2024

Preprint

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Metal-polluted soils can pose a severe threat to the environment and need remediation. We assessed the potential of jack bean and mucuna inoculated with rhizobial strains on the phytoremediation of soils contaminated by lead (Pb) smelting activities in Santo Amaro, Bahia state, the most severe case of Pb contamination in Brazil. Plants were grown in pots containing soils with three contamination levels for Pb, cadmium (Cd), and zinc (Zn) based on the distance from the chimney of the abandoned Pb smelter plant. Legumes and inoculated strains were tolerant to soil contamination. The BR 2811 strain is potentially indicated to increase jack bean biomass. The Cd, Pb, and Zn concentrations in plants were highest when grown on the soil with the highest contamination level. We found significant interactions between strains and soil contamination levels for phytoextraction efficiency. However, soil's very high metal contents can make phytoextraction unfeasible due to the time required to bring the metals to regulatory concentrations. The Cd, Pb, and Zn net removal from soil was proportional to increased contamination levels. The legumes did not show potential for Pb phytoextraction, but they have the potential for Zn phytoextraction and Cd phytostabilization. The BR 2811, BR 3501, and BR 7606 strains were the most promising to increase the phytoremediation potential of jack bean and mucuna.

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Spatial distribution, mineralogy, and weathering of heavy metals in soils along zinc-concentrate ground transportation routes: implication for assessing heavy metal sources

et al. 2017

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Guideline Values and Metal Contamination in Soils of an Environmentally Impacted Bay

Cited by 8 publications

References 48 publications

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

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

Assessing the phytoextraction of Cd, Pb, and Zn from a slag-contaminated soil by legume species inoculated with rhizobial strains

Spatial distribution, mineralogy, and weathering of heavy metals in soils along zinc-concentrate ground transportation routes: implication for assessing heavy metal sources

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