Plant availability and leaching of (heavy) metals from ammonium-, calcium-, carbohydrate-, and citric acid-treated uranium-mine-dump soil

2004 ◽  
Vol 167 (4) ◽  
pp. 417-427 ◽  
Author(s):  
Gerhard Gramss ◽  
Klaus-Dieter Voigt ◽  
Hans Bergmann
Keyword(s):  
Heavy Metals ◽  
Citric Acid ◽  
Uranium Mine ◽  
Plant Availability ◽  
Mine Dump

scholarly journals Enhanced Electrokinetic Remediation for the Removal of Heavy Metals from Contaminated Soils

2021 ◽  
Vol 11 (4) ◽  
pp. 1799
Author(s):  
Claudio Cameselle ◽  
Susana Gouveia ◽  
Adrian Cabo
Keyword(s):  
Heavy Metals ◽  
Citric Acid ◽  
Organic Acids ◽  
Contaminated Soils ◽  
Electrokinetic Remediation ◽  
Deionized Water ◽  
Soil Specimen ◽  
Removal Of Heavy Metals ◽  
Ph Conditions ◽  
Neutral Metal

The electrokinetic remediation of an agricultural soil contaminated with heavy metals was studied using organic acids as facilitating agents. The unenhanced electrokinetic treatment using deionized water as processing fluid did not show any significant mobilization and removal of heavy metals due to the low solubilization of metals and precipitation at high pH conditions close to the cathode. EDTA and citric acid 0.1 M were used as facilitating agents to favor the dissolution and transportation of metals. The organic acids were added to the catholyte and penetrated into the soil specimen by electromigration. EDTA formed negatively charged complexes. Citric acid formed neutral metal complexes in the soil pH conditions (pH = 2–4). Citric acid was much more effective in the dissolution and transportation out of the soil specimen of complexed metals. In order to enhance the removal of metals, the concentration of citric acid was increased up to 0.5 M, resulting in the removal of 78.7% of Cd, 78.6% of Co, 72.5% of Cu, 73.3% of Zn, 11.8% of Cr and 9.8% of Pb.

Leaching of heavy metals by citric acid from fly ash generated in municipal waste incineration plants

2011 ◽  
Vol 13 (2) ◽  
pp. 118-126 ◽  
Author(s):  
Kai Huang ◽  
Katsutoshi Inoue ◽  
Hiroyuki Harada ◽  
Hidetaka Kawakita ◽  
Keisuke Ohto
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Citric Acid ◽  
Waste Incineration ◽  
Municipal Waste ◽  
Municipal Waste Incineration

The Effect of Organic Matter and Organic Acid on the Chromium Release in Sediment

2014 ◽  
Vol 1081 ◽  
pp. 88-92
Author(s):  
Hui Liu ◽  
Jiu Lan Dai
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Citric Acid ◽  
Organic Acid ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Soluble Starch ◽  
Optimal Dosage ◽  
Tetraacetic Acid ◽  
Adsorption Time ◽  
Chromium Release

Effect of organic matter and organic acid on the heavy metals, especially, chromium (Cr) release in the sediment was researched. Glucose and soluble organic starch was used as organic matter, as well, citric acid and ethylene diamine tetraacetic acid (EDTA) were simulated as organic acid. The results showed that best adsorption time of glucose on Cr was 5h, the optimal dosage was 0.1g g-1; best adsorption time of organic soluble starch was 4h, and the optimum adding amount of 0.08g/g; best adsorption time of citric acid was 5h, the best concentration 0.005mol g-1; optimal adsorption time of organic acid EDTA was 3h, the optimum adding amount of 0.12g g-1. Glucose, soluble starch and citric acid significantly effected on the release of Cr in the sediment, however, influence of EDTA on the release of Cr was not so evident.

scholarly journals Adsorption of heavy metals and methylene blue from aqueous solution with citric acid modified peach stone

2018 ◽  
Vol 53 (11) ◽  
pp. 1678-1688 ◽  
Author(s):  
Junhua Yan ◽  
Guihong Lan ◽  
Haiyan Qiu ◽  
Chao Chen ◽  
Yongqiang Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Citric Acid

scholarly journals Simultaneous removal of multiple heavy metals from soil by washing with citric acid and ferric chloride

RSC Advances ◽  
2020 ◽  
Vol 10 (13) ◽  
pp. 7432-7442 ◽  
Author(s):  
Jiyan Shi ◽  
Jingli Pang ◽  
Qinglin Liu ◽  
Yating Luo ◽  
Jien Ye ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Citric Acid ◽  
Synergistic Effect ◽  
Ferric Chloride ◽  
Simultaneous Removal ◽  
Soil P ◽  
Multiple Heavy Metals

Citric acid and ferric chloride exhibited synergistic effect on the removal of multiple heavy metals from soil.

Speciation of selected heavy metals in soils and plant availability

1994 ◽  
Vol 37 (1) ◽  
pp. 233-239 ◽  
Author(s):  
Astrid Barona ◽  
Fernando Romero ◽  
Concepción Elejalde
Keyword(s):  
Heavy Metals ◽  
Plant Availability ◽  
Heavy Metals In Soils

Mobility of Ra-226 and Heavy Metals (U, Th and Pb) From Pyritic Uranium Mine Tailings Under Sub-Aqueous Disposal Conditions

2011 ◽  
Author(s):  
Nand K. Dave´
Keyword(s):  
Heavy Metals ◽  
Surface Water ◽  
Mine Tailings ◽  
Ion Concentration ◽  
Uranium Mine ◽  
Acid Generation ◽  
Shallow Zone ◽  
Acidic Conditions ◽  
Waste Repositories

Laboratory lysimeter studies were undertaken to evaluate the leaching characteristics and mobility of Ra-226 and other heavy metals (U, Th and Pb) from pyritic uranium mine tailings under sub-aqueous disposal conditions for assessing the long-term radiological stability of such waste repositories. The experiments were conducted using three types of un-oxidized tailings: fine, coarse and gypsum depleted mill total tailings. The results showed that Ra-226 was leached from surface of the submerged tailings and released to both surface water and shallow zone pore water during initial low sulphate ion concentration of the surface water cover in all three cases. The release of Ra-226 was further enhanced with the onset of weak acidic conditions in the surface water covers of both coarse and gypsum depleted mill total tailings. With additional acid generation and increasing sulphate and iron concentrations, the dissolved Ra-226 concentrations in the water covers of these tailings gradually decreased back to low levels. Pb was also leached and mobilized with the development of moderate acidic conditions at the surface of the submerged coarse and gypsum deplete tailings. No leaching of U and Th was observed.

Use of citric acid for heavy metals extraction from contaminated sewage sludge for land application

2006 ◽  
Vol 54 (9) ◽  
pp. 129-135 ◽  
Author(s):  
D. del Mundo Dacera ◽  
S. Babel
Keyword(s):  
Heavy Metals ◽  
Citric Acid ◽  
Land Application ◽  
Metal Extraction ◽  
Lead Removal ◽  
Inorganic Matter ◽  
Highly Effective ◽  
Removal Of Heavy Metals ◽  
Anaerobically Digested Sludge ◽  
Extracting Agents

Recent studies revealed that organic acids such as citric and oxalic acids seemed to be more promising as chemical extracting agents for removal of heavy metals from contaminated sludge, since they are biodegradable and can attain a higher metal extraction efficiency at mildly acidic pH compared to other extracting agents. Results of a lab-scale study on the efficiency of citric acid in the extraction of chromium (Cr), copper (Cu), lead (Pb), nickel (Ni) and zinc (Zn) from anaerobically digested sludge, revealed that citric acid seemed to be highly effective in extracting Cr (at 100%), Cu (at 88%), Ni (at 98%) and Zn (at 100%) at pH 2.33, mostly at 5 days leaching time except for Cu and Zn, which are at 1 day and 2 h contact times respectively. Lead removal at the same pH was also high at 95% but at a longer leaching time of 11 days. At pH 3, citric acid seemed to be highly effective in extracting Pb (at 100%) at 1 day leaching time, although higher removals were also attained for Ni (70%) and Zn (80%) at only 2 h leaching time. Chemical speciation studies showed that Cr, Cu and Ni in the sludge sample seem to predominate in residual fractions, while Pb and Zn were found mostly bound to organic and inorganic matter forms, hence the potential of the sludge for land application.

scholarly journals Chemical modification of Byrsonima crassifolia with citric acid for the competitive sorption of heavy metals from water

2014 ◽  
Vol 12 (9) ◽  
pp. 2867-2880 ◽  
Author(s):  
J. Monroy-Figueroa ◽  
D. I. Mendoza-Castillo ◽  
A. Bonilla-Petriciolet ◽  
M. A. Pérez-Cruz
Keyword(s):  
Heavy Metals ◽  
Citric Acid ◽  
Chemical Modification ◽  
Competitive Sorption ◽  
Byrsonima Crassifolia
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