Comparison of Extractants for Removing Heavy Metals from Contaminated Clayey Soils

Reddy, Krishna R.; Chinthamreddy, Supraja

doi:10.1080/10588330091134347

Cited by 87 publications

(38 citation statements)

References 19 publications

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“…Acids have been previously used for the removal of heavy metals from soils [13][14][15][16]21]. Seven different organic acids were selected for this study and were investigated at the same concentration.…”

Section: Extractantsmentioning

confidence: 99%

“…EDTA and DTPA were chosen as they possess proven efficiency for heavy metals [12][13][14][15]. EDTA forms stable complexes with zinc and lead, and the stability constants for EDTA and zinc complexes are 18.3, 21.7 and 19.9 for ZnL, ZnHL, and ZnOHL, respectively, while the stability constants for EDTA and lead complexes are 19.8 and 23.0 for PbL and PbHL, respectively [16].…”

Section: Extractantsmentioning

confidence: 99%

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Effect of different extraction agents on metal and organic contaminant removal from a field soil

Khodadoust

Reddy

Maturi

2005

Journal of Hazardous Materials

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128

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Section: Extractantsmentioning

confidence: 99%

Section: Extractantsmentioning

confidence: 99%

Effect of different extraction agents on metal and organic contaminant removal from a field soil

Khodadoust

Reddy

Maturi

2005

Journal of Hazardous Materials

Self Cite

128

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“…Organic or inorganic acids and chelating agents are usually used in soil remediation procedures to remove heavy metals (Reddy and Chinthamreddy 2000;Wasay et al 2000;Dacera and Babel 2008) while solvents or surfactants are more appropriate agents for the remediation of hydrophobic organic pollutants (Fava and Di Gioia 1998;Chu and Kwan 2003).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous phenanthrene and cadmium removal from contaminated soil by a ligand/biosurfactant solution

et al. 2011

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Surfactants and inorganic ligands are pointed as efficient to simultaneous removal of heavy metals and hydrophobic organic pollutants from soil. However, the biosurfactants are potentially less toxic to soil organisms than other chemical agents. Thus, in this study the efficiency of combinations of iodide (I(-)) ligand and surfactants produced by different bacterial species in the simultaneous removal of cadmium (Cd(2+)) and phenanthrene in a Haplustox soil sample was investigated. Four microbial surfactants and the synthetic surfactant Triton X-100 were tested with different concentrations of ligand. Soil samples contaminated with Cd(2+) and phenanthrene underwent consecutive washings with a surfactant/ligand solution. The removal of Cd(2+) increased with increased ligand concentration, particularly in solutions containing biosurfactants produced by the bacterial strains Bacillus subtilis LBBMA155 (lipopeptide) and Flavobacterium sp. LBBMA168 (mixture of flavolipids) and Triton X-100. Maximum Cd(2+) removal efficiency was 99.2% for biosurfactant produced by Arthrobacter oxydans LBBMA 201 (lipopeptide) and 99.2% for biosurfactant produced by Bacillus sp. LBBMA111A (mixed lipopeptide) in the presence of 0.336 mol iodide l(-1), while the maximum efficiency of Triton X-100 removal was 65.0%. The biosurfactant solutions removed from 80 to 88.0% of phenanthrene in soil, and the removal was not influenced by the presence of the ligand. Triton X-100 removed from 73 to 88% of the phenanthrene and, differently from the biosurfactants, iodide influenced the removal efficiency. The results indicate that the use of a single washing agent, called surfactant-ligand, affords simultaneous removal of organic contaminants and heavy metals.

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“…The use of soil washing to remediate contaminated finegrained soils that contained more than 30% fines fraction has been reported by several workers [113][114][115]. Khodadoust et al [59,116] have also studied the removal of various metals (Pb, Ni, and Zn) from field and clay (kaolin) soil samples using a broad spectrum of extractants (chelating agents and organic acids).…”

Section: Chemical Extractants For Soil Washingmentioning

confidence: 99%

Heavy Metals in Contaminated Soils: A Review of Sources, Chemistry, Risks and Best Available Strategies for Remediation

2011

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Scattered literature is harnessed to critically review the possible sources, chemistry, potential biohazards and best available remedial strategies for a number of heavy metals (lead, chromium, arsenic, zinc, cadmium, copper, mercury and nickel) commonly found in contaminated soils. The principles, advantages and disadvantages of immobilization, soil washing and phytoremediation techniques which are frequently listed among the best demonstrated available technologies for cleaning up heavy metal contaminated sites are presented. Remediation of heavy metal contaminated soils is necessary to reduce the associated risks, make the land resource available for agricultural production, enhance food security and scale down land tenure problems arising from changes in the land use pattern.

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Comparison of Extractants for Removing Heavy Metals from Contaminated Clayey Soils

Cited by 87 publications

References 19 publications

Effect of different extraction agents on metal and organic contaminant removal from a field soil

Effect of different extraction agents on metal and organic contaminant removal from a field soil

Simultaneous phenanthrene and cadmium removal from contaminated soil by a ligand/biosurfactant solution

Heavy Metals in Contaminated Soils: A Review of Sources, Chemistry, Risks and Best Available Strategies for Remediation

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