Assessment of Gross Accumulation and Leaching Characteristics of Heavy Metals in a Contaminated Urban Soil PDF Download
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Author: Michael David Kaminski
Publisher:
ISBN:
Category :
Languages : en
Pages : 432
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Author: Michael David Kaminski
Publisher:
ISBN:
Category :
Languages : en
Pages : 432
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Author: Elham Asrari
Publisher: CRC Press
ISBN: 177188004X
Category : Science
Languages : en
Pages : 388
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Book Description
Although adverse health effects of heavy metals have been known for a long time, exposure to heavy metals continues and is even increasing in some areas. Remediating heavy metal contaminated soils and water is necessary to reduce the associated health and ecological risks, make the land resource available for agricultural production, enhance food security, and scale down land tenure problems. This book discusses the causes and the environmental impact of heavy metal contamination. It then explores many exciting new methods of analysis and decontamination currently studied and applied in the field today.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Abstract : Lead (Pb), cadmium (Cd), and arsenic (As) are three common non-essential heavy metals found in urban soils and can prove toxic to animals, humans, and some plants at low concentrations. The main exposure pathways of heavy metals in humans are through ingestion and inhalation of soil particles and ingestion of contaminated food. When dealing with contaminated soil in urban environments, activities like urban gardening can increase the likelihood of these exposure pathways, so heavy metal toxicity from contaminated soil can become a greater risk with the increased interest in urban agriculture. The US EPA created target concentrations for these heavy metals in residential soil, industrial soil, and agricultural soil. If any of these soils exceed their designated concentration, the US EPA has deemed them hazardous to both human health and the surrounding ecosystem. Phytoextraction is being considered and tested as a method to remove heavy metal pollution in urban soils. Two popular forms of phytoextraction are 1) using hyperaccumulator plants and 2) chelate-assisted phytoextraction using metal tolerant species. Hyperaccumulating plants can bioaccumulate 100 to 1000 times the heavy metal concentration of non-hyperaccumulators but have low biomass production/growth rates and are heavy metal specific. Chelate-assisted phytoextraction has higher a growth rate and biomass production, but can be expensive, has a stronger potential for heavy metal trophic transfer, and can lead to leaching of heavy metals off of the contaminated site. Phytoextraction using hyperaccumulating plant species may pose less risk and be suited for smaller sites with specific heavy metal pollution whereas chelate-assisted phytoextraction may be a better approach for large sites with time sensitive phytoextraction needs, but because this method posed may risks, it needs to be highly monitored.
Author: Katherine Fiona Mossop
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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The investigation and remediation of land contaminated with metals (copper, nickel, lead and zinc) was investigated. Calcium, iron and manganesele vels within the soils studied were also investigated. Several soils were used to assessth e three-stageB CR sequential extraction procedure and recent recommended modifications to this procedure. In general the modifications to the procedure were found to increase levels of copper, lead and iron extracted by the reductant used in the procedure. The modified BCR sequential extraction procedure was then used to assess the success of remediation strategies. Column leaching experiments, with EDTA, were set up to simulate soil-flushing technologies. Soil was extracted using the BCR procedure both before and after treatment. The experiments highlighted the need to consider the soil characteristics when determining a remediation strategy. The technique was shown to be successful for the leaching of the more mobile forms of copper, lead and zinc from the soils studied. Phytoremediation and chelate assisted phytoremediation were also investigated using the BCR sequential extraction procedure. Taraxacum officianale (dandelion) was grown in soil contaminated with zinc. The experiment was designed to study the ability of the plant to accumulate metals and also to study the effect of the addition of the chelator EDTA and the effect of the addition of a fertiliser. These methods were shown to remove significant proportions of zinc, copper and lead from the soil studied, however the time frame for remediation based on such techniques may be considerably longer than that for conventional methods.
Author: Yi-ting Huang
Publisher:
ISBN:
Category : Heavy metals
Languages : en
Pages : 0
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Book Description
This thesis is focused on the investigation of heavy metal contaminated urban soils (especially lead and zinc). Soil samples from greater Montreal area were collected. The concentrations of lead and zinc of some soil samples were at elevated levels, with the highest concentration being 2000 mg/kg (the EPA standard limits for both metals is 300 mg/kg at residential soils). The physical and chemical properties of soils, including soil particle size distribution, soil cation exchange capacity (CEC), soil specific surface area (SSA), soil permeability coefficients, were determined. The majority of soil particles in the samples were found to have the texture of fine sand (loamy and silty sands). Selective sequential extraction (SSE) was performed to understand the affinities of heavy metals toward various fractions of soil. The results indicate that lead has the highest affinity toward soil fraction of organic matter, while zinc has the highest affinity toward soil oxides. Soil column leaching tests were carried out. SSE, together with soil leaching tests, explains the mobility of heavy metals. It shows that zinc has a higher mobility in soils than lead. With the knowledge of heavy metal mobility in soils, the soil decontamination scheme can be planned.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251305056
Category : Technology & Engineering
Languages : en
Pages : 156
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Book Description
This document presents key messages and the state-of-the-art of soil pollution, its implications on food safety and human health. It aims to set the basis for further discussion during the forthcoming Global Symposium on Soil Pollution (GSOP18), to be held at FAO HQ from May 2nd to 4th 2018. The publication has been reviewed by the Intergovernmental Technical Panel on Soil (ITPS) and contributing authors. It addresses scientific evidences on soil pollution and highlights the need to assess the extent of soil pollution globally in order to achieve food safety and sustainable development. This is linked to FAO’s strategic objectives, especially SO1, SO2, SO4 and SO5 because of the crucial role of soils to ensure effective nutrient cycling to produce nutritious and safe food, reduce atmospheric CO2 and N2O concentrations and thus mitigate climate change, develop sustainable soil management practices that enhance agricultural resilience to extreme climate events by reducing soil degradation processes. This document will be a reference material for those interested in learning more about sources and effects of soil pollution.
Author: Brian J. Alloway
Publisher: Springer Science & Business Media
ISBN: 9400744706
Category : Nature
Languages : en
Pages : 615
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Book Description
This third edition of the book has been completely re-written, providing a wider scope and enhanced coverage. It covers the general principles of the natural occurrence, pollution sources, chemical analysis, soil chemical behaviour and soil-plant-animal relationships of heavy metals and metalloids, followed by a detailed coverage of 21 individual elements, including: antimony, arsenic, barium, cadmium, chromium, cobalt, copper, gold, lead, manganese, mercury, molybdenum, nickel, selenium, silver, thallium, tin, tungsten, uranium, vanadium and zinc. The book is highly relevant for those involved in environmental science, soil science, geochemistry, agronomy, environmental health, and environmental engineering, including specialists responsible for the management and clean-up of contaminated land.
Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 806
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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309086256
Category : Technology & Engineering
Languages : en
Pages : 433
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Book Description
Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.
Author: Peter Hooda
Publisher: John Wiley & Sons
ISBN: 1444319485
Category : Technology & Engineering
Languages : en
Pages : 616
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Book Description
Trace elements occur naturally in soils and some are essential nutrients for plant growth as well as human and animal health. However, at elevated levels, all trace elements become potentially toxic. Anthropogenic input of trace elements into the natural environment therefore poses a range of ecological and health problems. As a result of their persistence and potential toxicity, trace elements continue to receive widespread scientific and legislative attention. Trace Elements in Soils reviews the latest research in the field, providing a comprehensive overview of the chemistry, analysis, fate and regulation of trace elements in soils, as well as remediation strategies for contaminated soil. The book is divided into four sections: • Basic principles, processes, sampling and analytical aspects: presents an overview including general soil chemistry, soil sampling, analysis, fractionation and speciation. • Long-term issues, impacts and predictive modelling: reviews major sources of metal inputs, the impact on soil ecology, trace element deficient soils and chemical speciation modelling. • Bioavailability, risk assessment and remediation: discusses bioavailability, regulatory limits and cleanup technology for contaminated soils including phytoremediation and trace element immobilization. • Characteristics and behaviour of individual elements Written as an authoritative guide for scientists working in soil science, geochemistry, environmental science and analytical chemistry, the book is also a valuable resource for professionals involved in land management, environmental planning, protection and regulation.
