Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

Mohammed, Syed Abu Sayeed; Moghal, Arif Ali Baig

doi:10.1007/s41062-016-0024-9

Cited by 18 publications

(5 citation statements)

References 31 publications

(28 reference statements)

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“…There is also a significant redistribution of heavy metals upon the addition of cow manure when compared with the unamended soil. Mohammed et al [34] reported similar trends for heavy metals in soils amended with nano-calcium silicate.…”

Section: Discussionmentioning

confidence: 76%

Immobilization Potential of Cow Manure for Heavy Metal Remediation from Refuse Dump Soil

Christian

Chukwuemeka

Enenche

et al. 2021

IRJPAC

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Aims: The present study investigated the effect of cow manure amendment on fractionation and availability of some heavy metals (Cd, Cu, Cr, Mn, Pb and Zn) in refuse dump soil. Study Design: A greenhouse study experiment was conducted to determine the uptake of the metals by Ricinus communis in dump soil treated with 0%, 5%, 10% and 20% cow manure. Place and Duration of Study: The study was carried out at the Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University Awka, Anambra State, Nigeria, between May and October 2018. Methodology: Experimental pots were filled with 2.0kg refuse dump soil in a green house and treated with 5%, 10% and 20% of Cow manure in three replicates per treatment. The seeds of Ricinus communis were planted in each pot and analysed after 12 weeks of planting for heavy metals using AAS. Sequential extraction was carried out on the treated soil after the harvest with each extract further analysed for heavy metals using AAS. Results: Application of cow manure significantly (p ˂ 0.05) affected the redistribution and the mobility of the heavy metals in the dump soil; as the concentration of the amendment increased, heavy metals in the mobile fractions reduced. 20% amendment had the best immobilization effect as the mobility factor decreased with increasing manure amendment. The mobility factors at 20% amendment were 18.34%, 15.82%, 5.23%, 15.86%, 25.56% and 12.81% for Cd, Cr, Cu, Mn, Pb and Zn respectively with the general trend of metal forms given as: residual > bound to organic > bound to Fe-Mn oxide > bound to carbonate > exchangeable. Conclusion: Cow manure amendment of the dump soil decreased the availability of heavy metals for plant uptake; and the metal uptake generally decreased as percentage amendment increased. Cow manure is therefore a good immobilizing agent for remediation of Cd, Cr, Cu, Mn, Pb and Zn in polluted soils.

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Section: Discussionmentioning

confidence: 76%

Immobilization Potential of Cow Manure for Heavy Metal Remediation from Refuse Dump Soil

Christian

Chukwuemeka

Enenche

et al. 2021

IRJPAC

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“…Often, the colloidal form of Sr has been determined in the water bodies, whereas less than 1 mg L 1 or 0.1 pCi L 1 (0.004 Bq L 1 ) has been determined in the United States. Further, the runoff/percolation of Sr-containing water into streams through the rocks and soils, acts as the major hosts for strontium via absorption/complexation of metal ions [38][39].…”

Section: Strontium Exposure -Plants and Animalsmentioning

confidence: 99%

“…But at hazardous waste disposal sites, radioactive waste sites, and Department of Energy facilities located around the United States it has been reported to have higher concentration of Sr. Further, it was reported that the ground water is also very prone to be acquainted with Sr through movement of the surface water to the deeper levels of the ground that join the ground water. However, the compounds of Sr may be undisturbed in the soil for years without moving to the ground water the reason for this can be the effect of the environment which can be a chemical reaction that converts Sr into insoluble forms such as precipitates, also the reverse of this has also been observed due to various changes occurring in the environment [38].…”

Section: Strontium Exposure -Plants and Animalsmentioning

confidence: 99%

“…A number of sorbents (based on carbon and non-carbon) have been evaluated for removal of Sr in soils [13]. The efficiency of sorption or a material which can remove or retain the highest amount of Sr is determined through some common parameters either experimentally or projected analytically using a number of empirical, semi empirical and mechanistic models that predict the best sorbent material [14,38,39]. Predominantly, Langmuir and Freundlich isotherms for monolayer and heterogeneous sorption are tested.…”

Section: Mechanistic Response For Strontium Removal In Soilsmentioning

confidence: 99%

See 1 more Smart Citation

State-of-the-Art Review on Strontium Toxicokinetics, Mechanistic Response, Alterations and Regulations

Moghal¹

2019

GEOMATE

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Strontium is mostly present in oil, coal, soil and rocks in the form of isotopes of four types 84 Sr, 86 Sr, 87 Sr and 88 Sr. It resembles the chemical form of calcium and even replaces the position in bones and other places where calcium finds its importance in the human or animal body. Strontium, if exchanged with calcium in greater quantity, can cause serious effects like cancer in bone and its neighbouring tissues and necrotic lesions. However, the effect is negligible when the exchange is lesser. If present in the geo-environment, strontium compounds in both forms stable or radioactive percolates in the groundwater, but a majority of this compound present in soil remains undisturbed for a considerable amount of time. The permissible amount of strontium which can be acceptable in water according to the US Environmental Protection Agency (USEPA) is 4 mg L 1 . Further presence of strontium up to 240 mg kg 1 in soil is considered as less toxic to grownups not suffering from malnutrition. Anthropogenic and natural activities leading to the release of strontium in the atmosphere pose a chance of transportation and deposition by the wet deposition method. The natural treatment of strontium by biodegradation or hydrolysis does not decay atoms of strontium due to its form. This paper deals with the chemical and physical properties and toxico-kinetics of strontium. Moreover, few points pertaining to health of flora and fauna when it is in direct contact with strontium and the safety concerns with relevant regulations are discussed.

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“…Methods adopted for retaining heavy metals by encapsulation decrease the mobility of heavy metal ions in the soil. The use of nano calcium silicate in retaining Cd, Ni, and Pb was observed as an effective [50,51] approach towards contaminant remediation. However, the costs associated with production of nano compounds on a macro scale is not economically feasible.…”

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

Self Cite

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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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Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

Cited by 18 publications

References 31 publications

Immobilization Potential of Cow Manure for Heavy Metal Remediation from Refuse Dump Soil

Immobilization Potential of Cow Manure for Heavy Metal Remediation from Refuse Dump Soil

State-of-the-Art Review on Strontium Toxicokinetics, Mechanistic Response, Alterations and Regulations

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

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