Selection and test of effective chelators for removal of heavy metals from contaminated soils

1995 ◽  
Vol 22 (6) ◽  
pp. 1185-1197 ◽  
Author(s):  
Ting-Chien Chen ◽  
Edward Macauley ◽  
Andrew Hong
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soils ◽  
Chelating Agents ◽  
Heavy Metal Contamination ◽  
Recovery Potential ◽  
Wide Range ◽  
Removal Of Heavy Metals ◽  
Zinc Chelator ◽  
Copper Lead

Heavy metal contamination of soil is a common problem at many hazardous waste sites. Chelating extraction of heavy metals has been proposed as a remediation technique for contaminated soils. A useful method was developed, which assessed 190 ligands for their ability in extraction and recovery of target metals, including cadmium, copper, lead, mercury, nickel, and zinc. Chelator performance was evaluated based on equilibrium calculations with an emphasis on the potential of recovering both the metals and chelating agents. Batch equilibration experiments over 24-h periods were performed to test three chelating agents, S-carboxymethyl-cysteine (SCMC), N-2-acetamidoiminodiacetic acid (ADA), and pyridine-2,6-dicarboxylic acid (PDA), which were deemed suitable for the extraction of cadmium, copper, lead, and zinc from soil. All three chelators demonstrated high extraction capability toward their respective target metals across a wide range of pH, metal, and ligand concentrations. In addition, all three chelators exhibited good recovery potential at moderately elevated pH values. The potential of many chelating agents and their effective pH ranges in the remediation of soils contaminated with heavy metals are reported. Key words: heavy metal, soil, contamination, chelation, remediation.

Distribution of heavy metals in seawater, sediment and biota of Jinhae Bay, Korea

1994 ◽  
Vol 30 (10) ◽  
pp. 173-177 ◽  
Author(s):  
Lee Chan-Won ◽  
Kwon Young-Tack
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Coastal Waters ◽  
Heavy Metal Contamination ◽  
Heavy Metal Concentration ◽  
Industrial Wastes ◽  
Subsequent Increase ◽  
Zinc Cadmium ◽  
Jinhae Bay ◽  
Copper Lead

Over the past two decades, the coastal waters of Jinhae Bay have been extensively used by coastal communities and industries for the disposal of domestic and various industrial wastes, therefore increasing the level of pollutants in coastal waters with a subsequent increase in sediments, especially of heavy metals. Specific objectives of this research are to investigate the distribution of heavy metal concentration in biota, to compare the concentrations with those in sediment and water and to relate the bioconcentration to the different heavy metals in biota obtained from several sites. Sixty one percent of heavy metals was found in particulate form during the high runoff season and 32% during the dry season. The behavior of the particulate metals after flowing in to the enclosed coastal sea is an important factor in heavy metal contamination. Copper, lead and chromium contamination of sediment was revealed at several sites. The bioconcentration factors (BCFs) of zinc, cadmium, copper, nickel, chromium and lead by the mussel (Mytilus edulis) were determined as 2,900, 2,814, 807, 423, 228 and 127 in the decreasing order, respectively. The areas located nearest to highly populated city and industries exhibited mussels with the largest accumulation of copper, lead and chromium.

scholarly journals Heavy metal composition of maize and tomato grown on contaminated soils

2018 ◽  
Vol 3 (1) ◽  
pp. 414-426
Author(s):  
A.O. Adekiya ◽  
A.P. Oloruntoba ◽  
S.O. Ojeniyi ◽  
B.S. Ewulo
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soils ◽  
Heavy Metal Contamination ◽  
Mining Area ◽  
Atomic Absorption Spectrophotometry ◽  
Toxic Heavy Metals ◽  
Mining Site ◽  
Solanum Lycopersicum L ◽  
Sources Of Pollution

Abstract The study investigated the level of heavy metal contamination in plants {maize (Zea mays) and tomato (Solanum lycopersicum L.)} from thirty soil samples of three locations (Epe, Igun and Ijana) in the Ilesha gold mining area, Osun State, Nigeria. Total concentrations of As, Cd, Co, Cr, Cu, Ni, Pb and Zn were determined using atomic absorption spectrophotometry. Spatial variations were observed for all metals across the locations which was adduced to pH and the clay contents of the soils of each location. The results showed that heavy metals are more concentrated in the areas that are closer to the mining site and the concentrations in soil and plants (maize and tomato) decreased with increasing perpendicular distance from the mining site, indicating that the gold mine was the main sources of pollution. The mean concentrations of heavy metals in plants (tomato and maize) samples were considered to be contaminated as As, Cd and Pb respectively ranged from 0.6 - 2.04 mg kg-1, 0.8 - 5.2 mg kg-1, 0.8 - 3.04 mg kg-1 for tomato and respectively 0.60 - 2.00 mg kg-1, 1.50 - 4.60 mg kg-1 and 0.90 - 2.50 mg kg-1 for maize. These levels exceeded the maximum permissible limits set by FAO/WHO for vegetables. In conclusion, monitoring of crops for toxic heavy metals is essential for food safety in Nigeria.

scholarly journals Heavy Metals Concentration in Contaminated Soils from Southern Part of Romania

2011 ◽  
Vol 68 (2) ◽  
Author(s):  
Diana FLORESCU ◽  
Andreea IORDACHE ◽  
Claudia SANDRU ◽  
Elena HORJ ◽  
Roxana IONETE ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soils ◽  
Metal Contamination ◽  
Industrial Waste ◽  
Heavy Metal Contamination ◽  
Land Application ◽  
Industrial Wastes ◽  
Treatment Processes ◽  
Contamination Of Soils

As a result of accidental spills or leaks, industrial wastes may enter in soil and in streams. Some of the contaminants may not be completely removed by treatment processes; therefore, they could become a problem for these sources. The use of synthetic products (e.g. pesticides, paints, batteries, industrial waste, and land application of industrial or domestic sludge) can result in heavy metal contamination of soils.

scholarly journals Fungal Community Diversity of a Heavy Metal Contaminated Soils Revealed by Metagenomics

2021 ◽  
Author(s):  
Michel Rodrigo Zambrano Passarini ◽  
Júlia Ronzella Ottoni ◽  
Paulo Emílio Santos Costa ◽  
Denise Cavalvante Hissa ◽  
Raul Maia Falcão ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soils ◽  
Heavy Metal Contamination ◽  
Community Diversity ◽  
Fungal Communities ◽  
Contaminated Sites ◽  
Contaminated Site ◽  
Toxic Compounds ◽  
Metagenomic Approach

Abstract The inappropriate disposal of toxic compounds generated by industrial activity has been impacting to the environment considerably. Microbial communities inhabiting contaminated sites may represent interesting ecological alternatives for the decontamination of environments. The present work aimed to investigate the fungal diversity inhabiting sediments from industrial waste containing heavy metals by using metagenomic approach. A total of twelve fungal orders were retrieved from datasets and, at phylum level, Ascomycota was the most abundant, followed by Basidiomycota, Chytridiomycota and Blastocladiomycota. Higher abundance of sequences was encountered within the less contaminated site, while the lower abundance was found in the sample with the higher contamination with lead. Gene sequences related to DNA repair and heavy metals biosorption processes were found in the four samples analyzed. The genera Aspergillus and Chaetomium, and Saccharomycetales order were highly present within all samples, showing their potential to be used for bioremediation studies. The present work demonstrated the importance of using the metagenomic approach to understand the dynamics of fungal communities and their behavior under heavy metal contamination, aiming the use in bioremediation processes of environments contaminated with heavy metals.

Detecting heavy metal contamination in soil using complex permittivity and artificial neural networks

2004 ◽  
Vol 41 (6) ◽  
pp. 1054-1067 ◽  
Author(s):  
J Q Shang ◽  
W Ding ◽  
R K Rowe ◽  
L Josic
Keyword(s):  
Heavy Metals ◽  
Neural Networks ◽  
Heavy Metal ◽  
Artificial Neural Networks ◽  
Complex Permittivity ◽  
Heavy Metal Contamination ◽  
Zinc Salt ◽  
Ann Model ◽  
Wide Range ◽  
Artificial Neural

The use of the complex permittivity, an intrinsic electrical property of materials, to detect the presence and type of heavy metals in soil is investigated. The soil specimens are prepared by mixing the soil with distilled and deionized water, NaCl solutions, and copper and zinc salt solutions and compacting at known water contents. The complex permittivities of the soil specimens are measured in the laboratory using a custom-developed apparatus. A database, which includes both contaminated and uncontaminated soil specimens, is developed, with the soil water content, density, and pore-fluid salinity varying over a relatively wide range. Two artificial neural network (ANN) models are developed to (i) identify whether the heavy metals are present in the soil; and, if so, (ii) distinguish the metal type, based on the complex permittivities measured on the soil specimens. The first ANN model (identification) can correctly identify the presence of heavy metals in 90% of cases. The second ANN model (classification) can correctly classify the type of the heavy metal in 95% of cases. Better performance can be achieved if more complex permittivity data are available for the training of the networks.Key words: heavy metals, soil contamination, contamination detection, complex permittivity, artificial neural networks.

scholarly journals Ecological risk assessment of heavy metal-contaminated soils of selected villages in Zamfara State, Nigeria

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Sharhabil Musa Yahaya ◽  
Fatima Abubakar ◽  
Nafiu Abdu
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Ecological Risk ◽  
Contaminated Soils ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Pollution Indices ◽  
Mining Activities ◽  
Positive Correlation ◽  
Flame Atomic Absorption

AbstractThe incidence of heavy metal contamination in Zamfara State, northern Nigeria, due to artisanal mining in some villages has resulted in the pollution of a vast area of land and water. This study evaluated the extent of environmental risks caused by heavy metals. It involved five (5) villages (Bagega, Dareta, Sunke, Tunga, and Abare) where mining activities were taking place and Anka town with no record of mining activities served as control. In each of the five villages, three sites (3) were identified as a mining site, processing site, and village making a total of sixteen (16) sites. Bulked soil samples were collected in triplicate and analyzed for iron, lead, cadmium, chromium, zinc, and nickel using flame atomic absorption spectrophotometry. Measured concentrations of the heavy metals in soils were then used to calculate the pollution and ecological risk pose by heavy metals. Their concentrations were in the order Fe > Pb > Cr > Zn > Cd > Ni, with Pb and Cd having a concentration higher than permissible levels for soils and accounted for 98.64% of the total potential ecological risk. Also, all the different pollution indices examined showed that all the sites were polluted with Cd, and all the processing sites were polluted with Pb. This reveals that processing sites pose more risk to heavy metal contamination. Correlation analysis showed a highly significant (p < 0.001) positive correlation between Pb and Zn, Cr and Ni, and a significant (p < 0.01) positive correlation between Fe and Pb, Zn and Cr. The principal component analysis suggested that Pb, Zn, Cr, and Ni likely originated from the same source, i.e., mining activities, and Fe and Cd originated from the abundant parent material in the study area.

Low Cost Absorbents, Techniques, and Heavy Metal Removal Efficiency

2018 ◽  
pp. 50-79
Author(s):  
Harendra Kumar Sharma ◽  
Irfan Rashid Sofi ◽  
Khursheed Ahmad Wani
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Contamination ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Future Research ◽  
Removal Of Heavy Metals ◽  
Living Species ◽  
High Concentrations

Heavy metal contamination in water is a serious concern to the environment and human health. High concentrations of heavy metals in the environment can be toxic to a variety of living species. Natural bio-absorbents are abundant and inexpensive and considered a waste if not managed properly. The role of bio-absorbents has been widely studied and has been utilized for the removal of heavy metals. The objective of the chapter is to search the database for different absorbents and their efficiency for the removal of heavy metals. Key words related to the study have been used to select different papers published by the researchers all over the world. A rigorous three-tier process has been utilized by the authors to select the papers from the database for the current study. This chapter has identified a few research gaps in the field of heavy metal removal by using different low cast absorbents that need to be taken into account in future research.

scholarly journals Heavy Metal Contamination of Roadside Soils of Northern England

2013 ◽  
Vol 1 (No. 4) ◽  
pp. 158-163 ◽  
Author(s):  
Akbar Khalid Farooq ◽  
Hale Wiliam HG ◽  
Athar Alistair D Headley and Mohammad
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soils ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Cadmium Concentration ◽  
Border Zone ◽  
Roadside Soils ◽  
Road Verge ◽  
Mean Concentration

Environmental pollution of heavy metals from automobiles has attained much attention in the recent past. The present research was conducted to study heavy metal contamination in roadside soils of northern England. Roadside soil samples were collected from 35 sites in some counties of northern England and analysed for four heavy metals (cadmium, copper, lead, zinc). Their concentrations and distributions in different road verge zones (border, verge, slope, ditch) were determined. Lead concentration was the highest in the soil and ranged from 25.0 to 1198.0 &mu;g/g (mean, 232.7 &mu;g/g). Zinc concentration ranged from 56.7 to 480.0 &mu;g/g (mean, 174.6 &mu;g/g) and copper concentration ranged from 15.5 to 240.0 &mu;g/g (mean, 87.3 &mu;g/g). Cadmium concentration was the lowest in the soil and varied from 0.3 to 3.8 &mu;g/g (mean, 1.4 &mu;g/g). Though the levels of heavy metals in roadside soils were higher as compared to their natural background levels in British soils, their concentrations in general, however, were below the &lsquo;critical trigger concentrations&rsquo; for the contaminated soils. All the four heavy metals exhibited a significant decrease in the roadside soils with the increasing distance from the road. The border zone had the highest mean concentration of the four metals whereas the ditch zone exhibited the lowest mean concentration.

Phytoremediation of Cadmium Contaminated Soils: Advances and Researching Prospects

2013 ◽  
Vol 743-744 ◽  
pp. 732-744 ◽  
Author(s):  
Hui Su ◽  
Zhang Cai ◽  
Qi Xing Zhou
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Soil Contamination ◽  
Contaminated Soils ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Low Cost ◽  
Organic Contamination ◽  
Metal Organic

More and more attention has been paid to soil contamination by heavy metals in recent years. Heavy metal contamination includes heavy metal - heavy metal contamination, heavy metal - organic contamination, and heavy metal nutrient contamination. In particular, soil contamination by cadmium (Cd) is the most typical one. In terms of the current remediation technologies, phytoremediation of Cd contaminated soil remains popular due to its low cost, environmental aesthetics and in-situ effective treatment. Therefore, screening-out and identification of Cd hyperaccumulators becomes a hotspot in this researching domain. In order to further improve the efficiency of phytoremediation, we have developed a variety of joint remediation technologies. Based on these work at home and abroad, we summed up the studying progress in this field. Some main researching contents and directions of phytoremediation for Cd contaminated soils were also proposed.

scholarly journals Extraction Efficiencies of Heavy Metals in Hydroethanolic Solvent from Herbs of Commerce

2010 ◽  
Vol 93 (2) ◽  
pp. 496-498 ◽  
Author(s):  
James Sullivan ◽  
Jackie Greenfield ◽  
Greg Cumberford ◽  
Jim Grant ◽  
Jeremy Stewart
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Dietary Supplement ◽  
Heavy Metal Contamination ◽  
Herbal Product ◽  
Good Manufacturing Practice ◽  
Metal Exposure ◽  
Human Consumption ◽  
Herbal Products ◽  
Wide Range

Abstract Heavy metal contamination of herbal products is a major concern in the herbal and dietary supplement industry. Heavy metal exposure is well-documented to cause a variety of adverse human health effects and to negatively impact our environment. The Final Rule for Dietary Supplements for current good manufacturing practice regulation, 21 U.S. Food and Drug Administration Code of Federal Regulations 111, requires dietary supplement manufacturers to establish herbal purity limits for heavy metal contaminants considered safe for human consumption. Heavy metals may enter into the herbal manufacturing process via bioaccumulation from the harvest site or during postharvest processing phases, such as drying and/or liquid extraction. Traditionally, herbalists have used hydroethanolic solvents to extract herbal biomasses in pure food-grade ethanolwater combinations with solvent polarities capable of removing a wide range of hydrophilic and lipophilic constituents. The presented data demonstrate that hydroethanolic solvents are not completely efficient in the extraction of heavy metal accumulations from plant matrixes; and can act as an effective decontamination step in herbal product processing.

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